(en)The present invention relates to isolated polypeptides having xylanase activity and polynucleotides encoding the polypeptides. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides.

1.ApplicationNumber: US-201313925182-A
1.PublishNumber: US-2014230097-A1
2.Date Publish: 20140814
3.Inventor: SPODSBERG NIKOLAJ

4.Inventor Harmonized: SPODSBERG NIKOLAJ(DK)

5.Country: US
6.Claims:
(en)The present invention relates to isolated polypeptides having xylanase activity and polynucleotides encoding the polypeptides. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides.

7.Description:
(en)CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. application Ser. No. 13/765,222 filed Feb. 12, 2013, which is incorporated herein by reference.


STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT
This invention was made in part with Government support under Cooperative Agreement DE-FC36-08G018080 awarded by the Department of Energy. The government has certain rights in this invention.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to polypeptides having xylanase activity and polynucleotides encoding the polypeptides. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides.
2. Description of the Related Art
Cellulose is a polymer of glucose linked by beta-1,4-bonds. Many microorganisms produce enzymes that hydrolyze beta-linked glucans. These enzymes include endoglucanases, cellobiohydrolases, and beta-glucosidases. Endoglucanases digest the cellulose polymer at random locations, opening it to attack by cellobiohydrolases. Cellobiohydrolases sequentially release molecules of cellobiose from the ends of the cellulose polymer. Cellobiose is a water-soluble beta-1,4-linked dimer of glucose. Beta-glucosidases hydrolyze cellobiose to glucose.
The conversion of lignocellulosic feedstocks into ethanol has the advantages of the ready availability of large amounts of feedstock, the desirability of avoiding burning or land filling the materials, and the cleanliness of the ethanol fuel. Wood, agricultural residues, herbaceous crops, and municipal solid wastes have been considered as feedstocks for ethanol production. These materials primarily consist of cellulose, hemicellulose, and lignin. Once the cellulose is converted to glucose, the glucose is easily fermented by yeast into ethanol. Xylanases degrade beta-1,4-xylan into xylose, thus breaking down hemicellulose, one of the major components of plant cell walls.
There is a need in the art to improve cellulolytic and hemicellulolytic enzyme compositions through supplementation with additional enzymes to increase efficiency and to provide cost-effective enzyme solutions for degradation of lignocellulose.
The present invention provides polypeptides having xylanase activity and polynucleotides encoding the polypeptides.
SUMMARY OF THE INVENTION
The present invention relates to isolated polypeptides having xylanase activity selected from the group consisting of:
(a) a polypeptide having at least 77% sequence identity to the mature polypeptide of SEQ ID NO: 2, or a polypeptide having at least 77% sequence identity to the mature polypeptide of SEQ ID NO: 4, or a polypeptide having at least 81% sequence identity to the mature polypeptide of SEQ ID NO: 6, or a polypeptide having at least 68% sequence identity to the mature polypeptide of SEQ ID NO: 8, or a polypeptide having at least 74% sequence identity to the mature polypeptide of SEQ ID NO: 10;
(b) a polypeptide encoded by a polynucleotide that hybridizes under low, or medium, or medium-high, or high, or very high stringency conditions with (i) the mature polypeptide coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9, (ii) the cDNA sequence thereof, or (iii) the full-length complement of (i) or (ii);
(c) a polypeptide encoded by a polynucleotide having at least 60% sequence identity to the mature polypeptide coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9; or the cDNA sequence thereof;
(d) a variant of the mature polypeptide of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10 comprising a substitution, deletion, and/or insertion at one or more (e.g., several) positions; and
(e) a fragment of the polypeptide of (a), (b), (c), or (d) that has xylanase activity.
The present invention also relates to isolated polypeptides comprising a catalytic domain selected from the group consisting of:
(a) a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 2 (for example, amino acids 18 to 349 of SEQ ID NO: 2), a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 4 (for example, amino acids 21 to 343 of SEQ ID NO: 4), a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 6 (for example, amino acids 81 to 376 of SEQ ID NO: 6), a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 8 (for example, amino acids 86 to 404 of SEQ ID NO: 8), or a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 10 (for example, amino acids 82 to 396 of SEQ ID NO: 10);
(b) a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 1 (for example, nucleotides 52-246, 300-390, 444-570, 624-625, 685-705, 764-1272, and 1333-1383 of SEQ ID NO: 1), a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 3 (for example, nucleotides 61-234, 300-390, 439-565, 751-1270, and 1327-1383 of SEQ ID NO: 3), a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 5 (for example, nucleotides 353-440, 493-548, 603-609, 667-756, 808-833, 885-980, 1037-1182, 1247-1355, 1408-1480, 1538-1557, 1613-1699, and 1754-1843 of SEQ ID NO: 5), a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 7 (for example, nucleotides 425-568, 633-723, 800-926, 980-985, 1043-1067, 1128-1640, and 1706-1762 of SEQ ID NO: 7), or a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 9 (for example, nucleotides 426-569, 635-725, 796-922, 977-978, 1041-1061, 1109-1617, and 1677-1727 of SEQ ID NO: 9);
(c) a variant of a catalytic domain comprising a substitution, deletion, and/or insertion of one or more (several) amino acids of the catalytic domain of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10; and
(d) a fragment of a catalytic domain of (a), (b), or (c), which has xylanase activity.
The present invention also relates to isolated polynucleotides encoding the polypeptides of the present invention; nucleic acid constructs; recombinant expression vectors; recombinant host cells comprising the polynucleotides; and methods of producing the polypeptides.
The present invention also relates to processes for degrading a cellulosic material or xylan-containing material, comprising: treating the cellulosic material or xylan-containing material with an enzyme composition in the presence of a polypeptide having xylanase activity of the present invention. In one aspect, the processes further comprise recovering the degraded or converted cellulosic material or xylan-containing material.
The present invention also relates to processes of producing a fermentation product, comprising: (a) saccharifying a cellulosic material or xylan-containing material with an enzyme composition in the presence of a polypeptide having xylanase activity of the present invention; (b) fermenting the saccharified cellulosic material or xylan-containing material with one or more (e.g., several) fermenting microorganisms to produce the fermentation product; and (c) recovering the fermentation product from the fermentation.
The present invention also relates to processes of fermenting a cellulosic material or xylan-containing material, comprising: fermenting the cellulosic material or xylan-containing material with one or more (e.g., several) fermenting microorganisms, wherein the cellulosic material or xylan-containing material is saccharified with an enzyme composition in the presence of a polypeptide having xylanase activity of the present invention. In one aspect, the fermenting of the cellulosic material or xylan-containing material produces a fermentation product. In another aspect, the processes further comprise recovering the fermentation product from the fermentation.
The present invention also relates to a polynucleotide encoding a signal peptide comprising or consisting of amino acids 1 to 17 of SEQ ID NO: 2, amino acids 1 to 20 of SEQ ID NO: 4, amino acids 1 to 20 of SEQ ID NO: 6, amino acids 1 to 19 of SEQ ID NO: 8, or amino acids 1 to 19 of SEQ ID NO: 10, which is operably linked to a gene encoding a protein; nucleic acid constructs, expression vectors, and recombinant host cells comprising the polynucleotides; and methods of producing a protein.
SEQUENCES OF THE INVENTION
Lentinus similis Strain NN048945 Genomic Nucleotide Sequence (SEQ ID NO: 1):







1
ATGAGAACTA ATCTCGTGGC CCTGCTGTCG GCGATATCAC TCGCAGCATC CGCCCCAACA TTCAACGGGA CCCTAGAAGG




81
ACGAGCGGCA CAAGCCACAG AGCTTCATGC CCTTGCCAAA CAACATGGCA AACTGTACTT CGGCACAGCA ACGGACAACC



161
CAGAGCTCAC CGACACGCCG TATGTTGCCA TCCTCGACGA CAACCAAATG TTCGGTCAAA TCACAGCTGC CAACAGTATG



241
AAATGGGTAA GCATTTGCCT GCGAGGAGAA TGGCCGTTGC TGATGTTCTT TCATATTAGG ACGCGACTGA ACCTTCCCGT



321
GGCCAGTTTA CGTTTGCCGC AGGCGACGTC ATTGCGAACC TGGCCAAGCA GAATGGGCAA TTGCTTCGAG GTGTGTCAAG



401
CCTGTTTCTA GATTTTCTCG TTCGCCTAAC AATACATGAT TAGGGCATAA TTGCGTTTGG CACAACCAGT TGCCAAGCTG



481
GGTGACCGCA GGTCACTTCT CCAAGGCGGA CTTGCTATCG ATTGTTCAGA CCCACTGCAG CACCCTGGTT GGACATTACA



561
AGGGACAAGT GTAAGTCTGC TACTACACCG ATCGAAAGCT AACGGACTCA CGTTCTCTCC TAGCTGTGAG TCTAAGGGCA



641
TACTACCTTG ACACATACTC AAGTACTGAC GTTAATAACT GAAGACGCTT GGGATGTCGT CAATGGTATG TTCACAGTGC



721
ATCTCGGTGT GGACTGCATC CCAACCGCAT TCCACATAAT CAGAGATCAT GAATGACAAC GGCACATTTG CGAACGACGT



801
CTTCTTCAGC ACTACAGGGA CAGATTACAT CGCCACCGCT TTCCGCGCTG CTCGCGCCGC TGACCCTAAT GCCAAACTAT



881
ATGCAAACGA CTTCAATATC GAAGGCACTG GCGCAAAATC AACCGCGTAC CAAAATCTCA TCCGTACTCT CAAATCCCAA



961
GGTGTACCCA TCGACGGCAT CGGCATGCAA TCTCACTTCA TCGTCGGGGA GCTCCCGCCA AACATCAAAC AGAACATACA



1041
GGCTTTCACC GCGCTGGGTG TGGAAGTGGC GATTACAGAG TTGGATGTGA GGATGACTTT GCCTGCTACT CAGGCATTGT



1121
TGCAACAGCA GCAGAAGGAT TATCAGACGG TGATCCAGGC TTGCAACGAG GTCCCGGGAT GCATCGGTGT TACACTTTGG



1201
GATTTCACGG ATAAGTTCTC GTGGGTGCCT GGCGCGTTCC CCGGACAGGG GGCTGCATGC CCTTGGGATC AGGTACGTAC



1281
CGGAAGTTCT CACTGTGAAA TGATCTCTAA CGTGCTCACG TACCAATCAC AGAATTTGCA ACTCAAGCCT GCCTTCACCG



1361
GTATTGTCAA TGGCTTCAAC TCATGA










































Exons/Introns (in Base Pairs) of SEQ ID NO: 1:












Exon 1
1-246 bp


Intron 1
247-299 bp


Exon 2
300-390 bp


Intron 2
391-443 bp


Exon 3
444-570 bp


Intron 3
571-623 bp


Exon 4
624-625 bp


Intron 4
626-684 bp


Exon 5
685-705 bp


Intron 5
706-763 bp


Exon 6
764-1272 bp


Intron 6
1273-1332 bp


Exon 7
1333-1386 bp



























Features (in Base Pairs) of SEQ ID NO: 1:










Signal Peptide
1-51
bp

Xylanase
52-246, 300-390, 444-570, 624-625, 685-705,
bp

catalytic site
764-1272, 1333-1383

Stop codon
1384-1386
bp

















Protein Sequence of Lentinus Similis Strain NN048945 Protein (SEQ ID NO: 2):








1
MRTNLVALLS AISLAASAPT FNGTLEGRAA QATELHALAK QHGKLYFGTA TDNPELTDTP




61
YVAILDDNQM FGQITAANSM KWDATEPSRG QFTFAAGDVI ANLAKQNGQL LRGHNCVWHN



121
QLPSWVTAGH FSKADLLSIV QTHCSTLVGH YKGQVYAWDV VNEIMNDNGT FANDVFFSTT



181
GTDYIATAFR AARAADPNAK LYANDFNIEG TGAKSTAYQN LIRTLKSQGV PIDGIGMQSH



241
FIVGELPPNI KQNIQAFTAL GVEVAITELD VRMTLPATQA LLQQQQKDYQ TVIQACNEVP



301
GCIGVTLWDF TDKFSWVPGA FPGQGAACPW DQNLQLKPAF TGIVNGFNS


















Features of SEQ ID NO: 2 (Amino Acid Positions):












Signal Peptide
1-17


Xylanase catalytic site
18-349
















Signal Peptide Sequence of SEQ ID NO: 2:








MRTNLVALLSAISLAAS








Lentinus Similis Strain NN048945 Genomic Nucleotide Sequence (SEQ ID NO: 3):








1
ATGTTTAGGT TCCTCACAGT TCCAGCATTA CTGCTAACAG CAGTTACCTA CGTCTCATGC ACCCCGACGT CAACCCCTAA




81
GCCCTTCCTG AATACCATAG CAAAGCAGCA CCGCAAGTTA TATTTCGGGA CTGCGACGAA CCTTGCGGAA TTTACTAACG



161
ATACTGCCTA CCGCGACATT ATCAGCGACA ATAGGGTTTT TGGACAGATC ACGCCTGCGC ATGGGATGAA ATGGGTTCCT



241
AGCATTTCCC CAAGGAAATA TTTACCTCTT TGCTGAACAT GTGCGCGACC CTGTTATAGG ATGAAATAGA ACCTGGTCCG



321
GGAAACTTCA CCTTCGAAGT TGCAGATGCC ATTGTTGCTT TTGCAAAGAG CAATGGTCAA ATCATGCGAG GCACGTTACA



401
TCCAATCTAC GTCGTCGGCC GTTACTCAGC TCCCACAGGT CACAATTGCG TATGGAACGA ACGAATCCCT GATTGGGTCG



481
AAAACGGCAC TTGGACCGAA GCAGAGTTGC TTTCTGTGGT TGAAAATCAC TGTGGTACCA TAGTTGGGAG GTATCGCGGT



561
CAAATGTGAG TTGTTCCCGC TGCGCTTCCC GGTGGATGTA AAGTTGATTT TATCAAGCTG TGAGTTGCTC TGATCCAGTG



641
TGTCTTGATA ACTCTCCGTT ACTAACCAGT ATGCACGAAT TGACTAGACT CCTGGGATGT AACCAACGGT GCGTATCCTC



721
AACCCCGATA CTGATTGAGT CTTGGACTAG AATAACCGCA GAGGTGATTA ACGACGATGG AACGTTCAGA GAAGACATCT



801
TCTTCAACAT CACCGGCACA AAATACATTG CAGCGGCCTT CCGCGCAGCT CGCGCCGCAG ACCCACACGC CAAGCTATAC



881
GCGAACGACT TCAACATCGA AGGGTTCAAC GTCAAGTCAG ATGCCTACCG CAAACTGATC CCAGAACTAA AGAGACAAGG



961
AGTGCCTATA GACGGGCTCG GGATACAATC GCATTTGACA GTGGGACAAA TACCCCCGAA TATCAAGGAG AACATCGAGT



1041
CCTTTGTTGC GCTTGGTGTA GAGGTCGCGT TGACGGAGTT GGATATCCGC ATGCCGCTTC CGCCTACACA GGAGATGTTG



1121
GAGCAGCAGA GGAAAGATTA CGAGACTGTC ATTGAGGCTT GTAATGCTGT GAGGGGTTGT ATTGGGGTGA CGGTATGGGA



1201
TTTCACGGAT AAGTATTCGT GGATACCGGG GAACTTTCCT GGATTGGGTG CTGCTTGTCC TTGGGATGAA GTGAGTACCT



1281
CTTGCTTTTG CTTTCTGAAT TTTGTGCCAT ACTAACAAGC GGACAGAATT TGCAAACGAA ACCTGCGATT TCTGGTATCA



1361
TCGATGGATT CAACCGAAAG AGTTGA










































Exons/Introns (in Base Pairs) of SEQ ID NO: 3:












Exon 1
1-234 bp


Intron 1
235-299 bp


Exon 2
300-390 bp


Intron 2
391-438 bp


Exon 3
439-565 bp


Intron 3
566-750 bp


Exon 5
751-1270 bp


Intron 5
1271-1326 bp


Exon 6
1327-1386 bp























Features (in Base Pairs) of SEQ ID NO: 3:













Signal Peptide
1-60
bp


Xylanase
61-234, 300-390, 439-565, 751-1270,
bp


catalytic site
1327-1383


Stop codon
1384-1386
bp


















Protein Sequence of Lentinus Similis Strain NN048945 Protein (SEQ ID NO: 4):








1
MFRFLTVPAL LLTAVTYVSC TPTSTPKPFL NTIAKQHRKL YFGTATNLAE FTNDTAYRDI




61
ISDNRVFGQI TPAHGMKWDE IEPGPGNFTF EVADAIVAFA KSNGQIMRGH NCVWNERIPD



121
WVENGTWTEA ELLSVVENHC GTIVGRYRGQ IITAEVINDD GTFREDIFFN ITGTKYIAAA



181
FRAARAADPH AKLYANDFNI EGFNVKSDAY RKLIPELKRQ GVPIDGLGIQ SHLTVGQIPP



241
NIKENIESFV ALGVEVALTE LDIRMPLPPT QEMLEQQRKD YETVIEACNA VRGCIGVTVW



301
DFTDKYSWIP GNFPGLGAAC PWDENLQTKP AISGIIDGFN RKS


















Features of SEQ ID NO: 4 (Amino Acid Positions):












Signal Peptide
1-20


Xylanase catalytic site
21-343
















Signal Peptide Sequence of SEQ ID NO: 4:








MFRFLTVPALLLTAVTYVSC








Lentinus Similis Strain NN048945 Genomic Nucleotide Sequence (SEQ ID NO: 5):








1
ATGAAGTCCC TCGCTGCCTT CGTCGCTTTA GCCGCTGCTT TGTCTGGCTC TGCCAACGCA GTAGCAGTTT GGGGCCAATG




81
TATGTCGCGT CCTATCATCC TGTTCCTCAC TTTTCGCTAA CTACATTATT GTCTCAGGCG GGGTATGTCA AATTCCTGCT



161
ATGTTAACGA ATGGCGGTAT TGAGAGAGAT TAGGGCATTG GTTATTCCGG GTCGACTGTC TGCGACGCAG GCACTACATG



241
TGTCAAGTTG AATGACTACT ACTCCCAATG CCAGCCTGGG GCTGCCACAT CGCCACCCGC GACGACATCA CAACCGGCCC



321
CCACAGGTTC GCCCGCTCCC GCCGCGAGTG GACTGGCCGC CGCTTTTGCT AAAAAGGGCA AGTTGTTCTG GGGAACTGCA



401
TCGGACTCCA ACAGATTCAA CGACGCAAAG GATTCCCAAG GTAAACACGC ACTTCACAAC GGATAATGCC CTTACTCAGG



481
ACGCCCATTC AGTGACAATC GCCAACTTCA ACAGTCTTAC CCCCGAAAAC TCCATGAAGT GGGATGCAGT AAGCGTTGTT



561
CTTCTCATCA TCGGACGTGA TCCATATTGA TTGTATATGC AGACTGAGCG TAAGTTTGCG GTTTGTACTG TTCCCTATTG



641
GTTGTAAATG CCACTATTCT CCATAGCCAG CCGTGGTCAG TTCTCCTTCT CTGGTGCGGA CGCACTAGTC AACTACGCCA



721
GCCAGCACGG AATGTTAGTT CGTGCTCACA CGTTGGGTTT GTCGTTCATA CCTCAGGTCG AATGTGCGTA GACTGACATA



801
TCTCCAGTTT GGCATTCTCA GCTCCCATCA TGGGTATGAT CATTGGACAT GTCGTCCTTT ATCAGCTACT CATTCGGAGT



881
CTAGGTCTCT TCCATTTCGG ACAAAACAAC GCTGACCTCA GTCATTCAAA ACCACATTTC CACTGTCGCC GGAAGATATA



961
AAGGAAAGGT TAGGTCTTGG GTATGTACTA CCTCTTTCAC CTCGAAGCGT GTCATATATC TGATTATTCC TGACAGGATG



1041
TTGTCAACGA GATCTTCAAC GAGGATGGAA CGTTCCGCTC ATCCGTCTTC TACAATGTGC TCGGCCAAAG CTTCGTTACT



1121
CTCGCGTTCC AAGCTGCCAG GCAAGCAGAT CCTAACGCCA AGCTGTACAT CAACGACTAC AAGTAGGTCA CTACGCGGCC



1201
TATTGTTGAA CGGTTCATGC AATTAATTGA CAACAATCGT GTACAGCTTG GATAGCGCCA ATGCCAAGTT GACGGCCGTT



1281
GTCAACCTTG TGAAGCAGAT TAACAATAGC GGTACGAAGC TCATCGACGG TATCGGTACT CAGATGCACC TCTCGGTTCG



1361
TTACCAAACC AATTGTTTGT TACGATAGTT GTGCTTATTT CATCCAGGCT GGAGGCGCGG GAGGTGCCCA GGCGGCTCTC



1441
CAGCTTGCTG CGACTGCTGG TGTCGAGGTT GCTATCACCG GTGAGTTATT GCAGGGCATG AACGTGATCG CAGGATACTG



1521
ATATCACTTC GATCCAGAAT TGGATATTGC GAATGCTGTA CGTCTTTTCA CGCTACTTGA GGCATAACTT TTTTGACGTG



1601
GCCTTTCCTC AGGCCCCCAA CGACTATGTT ACCGTCGTGA AAGCTTGCTT GGCTGTCTCT AACTGCGTAT CTATCACGAG



1681
CTGGGGTGTC AGTGACAAGG TCAGGCATCC TTTGCTCACC TTTGCTACCT ATACAGCTGA ACTTTCCTCG CAGGACTCTT



1761
GGCGTGCATC CACGAACCCT CTGCTCTTCG ATGCTAACTT TAACCCTAAG CCTGCATACA CTGCCATCTT GCAGGCACTT



1841
GCCTAA






















































Exons/Introns (in Base Pairs) of SEQ ID NO: 5:












Exon 1
1-79 bp


Intron 1
80-137 bp


Exon 2
138-176 bp


Intron 2
177-230 bp


Exon 3
231-440 bp


Intron 3
441-492 bp


Exon 4
493-548 bp


Intron 4
549-602 bp


Exon 5
603-609 bp


Intron 5
610-666 bp


Exon 6
667-756 bp


Intron 6
757-807 bp


Exon 7
808-833 bp


Intron 7
834-884 bp


Exon 8
885-980 bp


Intron 8
981-1036 bp


Exon 9
1037-1182 bp


Intron 9
1183-1246 bp


Exon 10
1247-1355 bp


Intron 10
1356-1407 bp


Exon 11
1408-1480 bp


Intron 11
1481-1537 bp


Exon 12
1538-1557 bp


Intron 12
1558-1612 bp


Exon 13
1613-1699 bp


Intron 13
1700-1753 bp


Exon 14
1754-1846 bp









































Features (in Base Pairs) of SEQ ID NO: 5:










Signal Peptide
1-60
bp

Cellulose Binding
61-79, 138-176, 231-277
bp

Module 1 (CBM 1)

Linker
278-352
bp

Xylanase
353-440, 493-548, 603-609, 667-756, 808-833,
bp

catalytic site
885-980, 1037-1182, 1247-1355, 1408-1480,


1538-1557, 1613-1699, 1754-1843

Stop codon
1844-1846
bp





















Protein Sequence of Lentinus Similis Strain NN048945 Protein (SEQ ID NO: 6):








1
MKSLAAFVAL AAALSGSANA VAVWGQCGVC QIPAMLTNGG TTCVKLNDYY SQCQPGAATS




61
PPATTSQPAP TGSPAPAASG LAAAFAKKGK LFWGTASDSN RFNDAKDSQV TIANFNSLTP



121
ENSMKWDATE PSRGQFSFSG ADALVNYASQ HGMLVRAHTL VWHSQLPSWV SSISDKTTLT



181
SVIQNHISTV AGRYKGKVRS WDVVNEIFNE DGTFRSSVFY NVLGQSFVTL AFQAARQADP



241
NAKLYINDYN LDSANAKLTA VVNLVKQINN SGTKLIDGIG TQMHLSAGGA GGAQAALQLA



301
ATAGVEVAIT ELDIANAAPN DYVTVVKACL AVSNCVSITS WGVSDKDSWR ASTNPLLFDA



361
NFNPKPAYTA ILQALA




















Features of SEQ ID NO: 6 (Amino Acid Positions):












Signal Peptide
1-20


Cellulose Binding
21-55


Module 1 (CBM 1)


Linker
56-80


Xylanase catalytic site
81-376



















Signal Peptide Sequence of SEQ ID NO: 6:








MKSLAAFVALAAALSGSANA








Lentinus Similis Strain NN048945 Genomic Nucleotide Sequence (SEQ ID NO: 7):








1
ATGAAGCTTG CTGGTACCCT CGCTGCTCTC ATTACCGCCA TGCCGTTCGT GGTTGCTCAA TCCCAAGAGT ATGGACAATG




81
TAGGTCCAAT TGCAAGCTCA GGGTATTGCC ATGAGGTACT AATCATACCC TCGATACTAG GTTTCGGCAT CGTATGTTTA



161
GATATTCTGT ATTCTGTATC ATATGCCCGA ACTCAAAAGT GTGACAGGGG TTTTCAGGTC CCAGAACGTG CGTTCCGGGA



241
GCTTACTGCA CCAAGCTGAA CGATTACTTC TCTCAATGTC TCCCGGGCGT GAGTATTTGC CTCATCCCCA ATGCCCGAGT



321
GATTGACAAT ACTTCCTCAG AACTATGCGG ATCCCACTAG CACTGATACC CCTCCCCCCA CAAGCAGCAC CGTATCTTCA



401
CCAACATCGA CACCGACAGG TAGGTCCAAT AGCATCGCCA AATCCCATGG CCTGACCTAC TTCGGGTCTG CCACTGACAA



481
CCCGGAGCTT TCTGATAAAG CCTACGTCGC TATCCTCAGC GATACAGCTA CATTCGGTCA AATCACTCCT GCGAACAGCA



561
TGAAATGGGT ATGTTCACTT CTTACCACAG GTAGTCGGGA GGTTGATTTG TGTCTTGGAA CGAAACTGTT AGGACGCTAC



641
TGAGCCTTCT CGCGGTAACT TCACTTTCAC GAACGGCGAT GTGATTGCCA ACCTTGCCAA GGCGAATGGA CAATTGCTCA



721
GAGGTATGCC TGTTCCCACT GCGGCTGGTA CAACCACATC GAGAGACTAA AGGTACTCAT GACGGTACGT TGTTGTCAGG



801
GCAGAATTGC GTCTGGTACA ATCAGCTCCC TTCCTGGGTT ACCTCCGGCA ACTTCGATGC TCCCACCTTG ATGTCCATCA



881
TTCAGACCCA TTGCAGCACT CTTGTTGATC ACTACAAGGG TCAAATGTGC GTACGTGATA ACTGGGACGG GGTTTGATGA



961
CTGACCGCTG TTCTTTCAGC TGTGTGTATT TTTCGGCACA GTAGGCTTGA ATTCCTTACT GATATTCTCT GTTGATTTCT



1041
AGACTCTTGG GATGTCATCA ATGGCAAGTA TCGCATTCCA TTACCGTTCA ACTTGAAGCT GAACCGACAG CTTTGCACCC



1121
TACAGAGCCC TTCTTGGATG ACGGTGCTTG GCGACCGCAC GTCTTCTACA ATGTCTTGGG CACAAGTTAC GTCAAGATCG



1201
CTCTTGAAGC TGCCCGTGCT GCTGATCCTG CGGCCAAGCT CTACATTAAT GACTACAACA TAGAAACTTC CGGAGACAAG



1281
GCCACCGCCA TGCAGAACCT GATCAAGTCT CTCAAGTCTG ACAATGTCCC CATTGACGGT GTCGGCTTTC AGGGCCACTT



1361
CATCGCCGGT GGTCTTCCCT CCGAGTCTGC CCTTAAGCAG AATATTCTCG CTTTTGTTGA CCTACGTCGC GAGGTTGCGT



1441
TCACTGAACT TGATATCAGG ATGGACACGC CTGCGTCTGC TGCCGGTCTT CAGCAGCAAG CGATAGACTA TGCGACTGTG



1521
GTTTCGGCAT GCCGTGCTGT CAAGGGTTGC ATCGGTATCA CCGTCTGGGA CTACACAGAC AAGTACTCCT GGGTTCCGTT



1601
GACCTTCTCT GGTCAGGGTG CTGCTTGTCC ATGGGATGAG GTACGTAACC TATCGGATTC TCTGCTATGT ACCTGCGGTC



1681
TAAGAGACAC CGTCCCGTCT CGTAGAACCT CCAACCGAAG CTAGCGTATA CCAGTATTGC GCAAGCACTG TTGGGTGGGG



1761
CCTGA




















































Exons/Introns (in Base Pairs) of SEQ ID NO: 7:












Exon 1
1-79 bp


Intron 1
80-140 bp


Exon 2
141-151 bp


Intron 2
152-207 bp


Exon 3
208-288 bp


Intron 3
289-340 bp


Exon 4
341-568 bp


Intron 4
569-632 bp


Exon 5
633-723 bp


Intron 5
724-799 bp


Exon 6
800-926 bp


Intron 6
927-979 bp


Exon 7
980-985 bp


Intron 7
986-1042 bp


Exon 8
1043-1067 bp


Intron 8
1068-1127 bp


Exon 9
1128-1640 bp


Intron 9
1641-1705 bp


Exon 10
1706-1765 bp

































Features (in Base Pairs) of SEQ ID NO: 7:













Signal Peptide
1-57
bp


Cellulose Binding
58-79, 141-151, 208-285
bp


Module 1 (CBM 1)


Linker
286-288, 341-424
bp


Xylanase
425-568, 633-723, 800-926, 980-985,
bp


catalytic site
1043-1067, 1128-1640, 1706-1762


Stop codon
1763-1765
bp





















Protein Sequence of Lentinus Similis Strain NN048945 Protein (SEQ ID NO: 8):








1
MKLAGTLAAL ITAMPFVVAQ SQEYGQCGGI GFSGPRTCVP GAYCTKLNDY FSQCLPGNYA




61
DPTSTDTPPP TSSTVSSPTS TPTGGLNSIA KSHGLTYFGS ATDNPELSDK AYVAILSDTA



121
TFGQITPANS MKWDATEPSR GNFTFTNGDV IANLAKANGQ LLRGQNCVWY NQLPSWVTSG



181
NFDAPTLMSI IQTHCSTLVD HYKGQIYSWD VINEPFLDDG AWRPHVFYNV LGTSYVKIAL



241
EAARAADPAA KLYINDYNIE TSGDKATAMQ NLIKSLKSDN VPIDGVGFQG HFIAGGLPSE



301
SALKQNILAF VDLGVEVAFT ELDIRMDTPA SAAGLQQQAI DYATVVSACR AVKGCIGITV



361
WDYTDKYSWV PLTFSGQGAA CPWDENLQPK LAYTSIAQAL LGGA




















Features of SEQ ID NO: 8 (Amino Acid Positions):












Signal Peptide
1-19


Cellulose Binding
20-56


Module 1 (CBM 1)


Linker
57-85


Xylanase catalytic site
86-404



















Signal Peptide Sequence of SEQ ID NO: 8:








MKLAGTLAALITAMPFVVA








Lentinus Similis Strain NN048945 Genomic Nucleotide Sequence (SEQ ID NO: 9):








1
ATGAAGCTTT CTGGTACGCT TGCCGCTCTT ATCGCCATTC TCCCCTTTGC AGCTGCACAA TCTCAAGAGT GGGGTCAATG




81
TAAGCCTTCC ATACGACTCA TCGTTAGTGA AACTGTGGAT TGCTGACTCT TATTTCAATA GGTGGCGGGA TTGTGAGTAT



161
ATATAGGTCT TTTCAGGCAA CTTTGCAATA TGAAGCTCAG AATCCTGTAG GGCTGGACTG GTCCGACAAC ATGCGTTGCC



241
GGAACCATCT GTGTCAAGCA GAACGATTAC TACTCTCAGT GCCTTCCATC TGTCAGTCTG CCATCATGCG TCCTCATGAA



321
GACGTCTTTG ACTCAGTTAC ATGTTTTATT TAGACCTCGG TTCCCACTTC CGTTCCCCCG CCTACCAGCA CCGTGTCTTC



401
ACCTGGATCG ACGCCAACGG CAGGTCTCAA TAGTATCGCC CAGGCCCATG GCCTGACCTA CTTCGGCTCT GCCACGGACA



481
ACCCAGAGCT TTCTGACCAG GCCTATGTCG CCATCCTCAG CGACAACACT ATGTTCGGTC AGATCACACC TGGAAACAGT



561
ATGAAATGGG TACGTTCGTG GCTCAAGCAT GCAGGGAGTA CGCGACTGAC CAGCAACATT ATTTGGAATC GTAGGATGCT



641
ACTGAGCCTT CTCGAGGTAC TTTCACTTTC TCCGGAGGTG ATGTGATCGC AAACCTCGCC AAGACGAATG GGCAATTGCT



721
CCGAGGTATG CACGCTTTCA TTCATTCTCT ACATGGGATG GAAAAGATAC GGTACTTATG AGGCTTCTCT CGTAGGGCAT



801
AACTGTGTTT GGTACAATCA GCTTCCTTCC TGGGTATCCT CTGGAAACTT CGATGCTCCC ACCTTGACGT CCATCGTGCA



881
GACTCATTGC AGCACTCTTG TTGGTCATTA CAAGGGTCAA ATGTGAGTAA TTCTATTTCT ATGATCTCCG AAACAGACTG



961
AATGATGCTC TTTCAGTTGT GTGTGGAATT CAATGTCGCG ATCATAACGT TGACTGATGT TTTGCTTTGA CATTCGAAAG



1041
ATTCTTGGGA TGTTATCAAC GGTGAGTTAT TCTCTCGCCG TCCCTGAGCT TGTATCTAAC TCGAACAGAA CCCTTCAACG



1121
ATGACGGTAC TTGGCGCCAG GACGTCTTCT ACAACGTATT GGGCACAAGC TACGTTCAGA TTGCCTTAGA GGCTGCCCGT



1201
GCTGCCGACC CTGCGGCCAA GCTGTACATT AACGACTACA ACATCGAAGG TCCTGGAGCC AAGGCCACCG CCATGCAGAA



1281
CCTCATCAAG ACCCTCAAGA CCAACAACGT ACCCATCGAT GGTGTCGGTC TTCAAGGTCA CTTCATCGTC GGCGCTCTCC



1361
CCTCTGGCAT TCAGCAGAAC ATCCAGGCTT TCGTGAACCT CGGCGTTGAG GTCGCCATCA CCGAGCTAGA TATTAGGACG



1441
ACCACTCCCG CGTCGTCTTC TGCTCTTCAG CAGCAGGCGA AGGATTATGC GACTGTGGTC ACGGCATGTC GTGCTGTGAA



1521
GGGTTGTATT GGTATCACCG TCTGGGACTA CACAGACAAG TACTCTTGGG TTCCGTCGAC CTTCTCTGGT CAGGGTGCTG



1601
CTTGCCCGTG GGACCAGGTG AGTTATCTAT AGGCTTCTCT GCTGTGTACT GCGGTCTGAG ACGCGCCGAC CCGCAGAACC



1681
TCCAACCAAA GCCAGCGTAC ACCAGTATTG CACAATCGTT GGCTGCCTAA


















































Exons/Introns (in Base Pairs) of SEQ ID NO: 9:












Exon 1
1-79 bp


Intron 1
80-141 bp


Exon 2
142-152 bp


Intron 2
153-210 bp


Exon 3
211-291 bp


Intron 3
292-353 bp


Exon 4
354-569 bp


Intron 4
570-634 bp


Exon 5
635-725 bp


Intron 5
726-795 bp


Exon 6
796-922 bp


Intron 6
923-976 bp


Exon 7
977-978 bp


Intron 7
979-1040 bp


Exon 8
1041-1061 bp


Intron 8
1062-1108 bp


Exon 9
1109-1617 bp


Intron 9
1618-1676 bp


Exon 10
1677-1730 bp

































Features (in Base Pairs) of SEQ ID NO: 9:

Signal Peptide 1-57 bp Cellulose Binding 58-79, 142-152, 211-288 bp Module 1 (CBM 1) Linker 289-291, 354-425 bp Xylanase 426-569, 635-725, 796-922, 977-978, bp catalytic site 1041-1061, 1109-1617, 1677-1727 Stop codon 1728-1730 bp
Protein Sequence of Lentinus similis Strain NN048945 Protein (SEQ ID NO: 10):








1
MKLSGTLAAL IAILPFAAAQ SQEWGQCGGI GWTGPTTCVA GTICVKQNDY YSQCLPSTSV




61
PTSVPPPTST VSSPGSTPTA GLNSIAQAHG LTYFGSATDN PELSDQAYVA ILSDNTMFGQ



121
ITPGNSMKWD ATEPSRGTFT FSGGDVIANL AKTNGQLLRG HNCVWYNQLP SWVSSGNFDA



181
PTLTSIVQTH CSTLVGHYKG QIYSWDVINE PFNDDGTWRQ DVFYNVLGTS YVQIALEAAR



241
AADPAAKLYI NDYNIEGPGA KATAMQNLIK TLKTNNVPID GVGLQGHFIV GALPSGIQQN



301
IQAFVNLGVE VAITELDIRT TTPASSSALQ QQAKDYATVV TACRAVKGCI GITVWDYTDK



361
YSWVPSTFSG QGAACPWDQN LQPKPAYTSI AQSLAA




















Features of SEQ ID NO: 10 (Amino Acid Positions):












Signal Peptide
1-19


Cellulose Binding
20-56


Module 1 (CBM 1)


Linker
57-81


Xylanase catalytic site
82-396



















Signal Peptide Sequence of SEQ ID NO: 10:








MKLSGTLAALIAILPFAAA








DEFINITIONS
Xylanase: The term “xylanase” means a 1,4-beta-D-xylan-xylohydrolase (E.C. 3.2.1.8) that catalyzes the endohydrolysis of 1,4-beta-D-xylosidic linkages in xylans. For purposes of the present invention, xylanase activity is determined with 0.2% AZCL-arabinoxylan as substrate in 0.01% TRITON® X-100 and 200 mM sodium phosphate buffer pH 6 at 37° C. One unit of xylanase activity is defined as 1.0 micromole of azurine produced per minute at 37° C., pH 6 from 0.2% AZCL-arabinoxylan as substrate in 200 mM sodium phosphate pH 6 buffer. In one aspect, the polypeptides of the present invention have at least 20%, e.g., at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 95%, or at least 100% of the xylanase activity of the mature polypeptide of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10.
Acetylxylan esterase: The term “acetylxylan esterase” means a carboxylesterase (EC 3.1.1.72) that catalyzes the hydrolysis of acetyl groups from polymeric xylan, acetylated xylose, acetylated glucose, alpha-napthyl acetate, and p-nitrophenyl acetate. For purposes of the present invention, acetylxylan esterase activity is determined using 0.5 mM p-nitrophenylacetate as substrate in 50 mM sodium acetate pH 5.0 containing 0.01% TWEEN™ 20 (polyoxyethylene sorbitan monolaurate). One unit of acetylxylan esterase is defined as the amount of enzyme capable of releasing 1 micromole of p-nitrophenolate anion per minute at pH 5, 25° C.
Allelic variant: The term “allelic variant” means any of two or more alternative forms of a gene occupying the same chromosomal locus. Allelic variation arises naturally through mutation, and may result in polymorphism within populations. Gene mutations can be silent (no change in the encoded polypeptide) or may encode polypeptides having altered amino acid sequences. An allelic variant of a polypeptide is a polypeptide encoded by an allelic variant of a gene.
Alpha-L-arabinofuranosidase: The term “alpha-L-arabinofuranosidase” means an alpha-L-arabinofuranoside arabinofuranohydrolase (EC 3.2.1.55) that catalyzes the hydrolysis of terminal non-reducing alpha-L-arabinofuranoside residues in alpha-L-arabinosides. The enzyme acts on alpha-L-arabinofuranosides, alpha-L-arabinans containing (1,3)- and/or (1,5)-linkages, arabinoxylans, and arabinogalactans. Alpha-L-arabinofuranosidase is also known as arabinosidase, alpha-arabinosidase, alpha-L-arabinosidase, alpha-arabinofuranosidase, polysaccharide alpha-L-arabinofuranosidase, alpha-L-arabinofuranoside hydrolase, L-arabinosidase, or alpha-L-arabinanase. For purposes of the present invention, alpha-L-arabinofuranosidase activity is determined using 5 mg of medium viscosity wheat arabinoxylan (Megazyme International Ireland, Ltd., Bray, Co. Wicklow, Ireland) per ml of 100 mM sodium acetate pH 5 in a total volume of 200 microliters for 30 minutes at 40° C. followed by arabinose analysis by AMINEX® HPX-87H column chromatography (Bio-Rad Laboratories, Inc., Hercules, Calif., USA).
Alpha-glucuronidase: The term “alpha-glucuronidase” means an alpha-D-glucosiduronate glucuronohydrolase (EC 3.2.1.139) that catalyzes the hydrolysis of an alpha-D-glucuronoside to D-glucuronate and an alcohol. For purposes of the present invention, alpha-glucuronidase activity is determined according to de Vries, 1998, J. Bacteriol. 180: 243-249. One unit of alpha-glucuronidase equals the amount of enzyme capable of releasing 1 micromole of glucuronic or 4-O-methylglucuronic acid per minute at pH 5, 40° C.
Beta-glucosidase: The term “beta-glucosidase” means a beta-D-glucoside glucohydrolase (E.C. 3.2.1.21) that catalyzes the hydrolysis of terminal non-reducing beta-D-glucose residues with the release of beta-D-glucose. For purposes of the present invention, beta-glucosidase activity is determined using p-nitrophenyl-beta-D-glucopyranoside as substrate according to the procedure of Venturi et al., 2002, Extracellular beta-D-glucosidase from Chaetomium thermophilum var. coprophilum : production, purification and some biochemical properties, J. Basic Microbiol. 42: 55-66. One unit of beta-glucosidase is defined as 1.0 micromole of p-nitrophenolate anion produced per minute at 25° C., pH 4.8 from 1 mM p-nitrophenyl-beta-D-glucopyranoside as substrate in 50 mM sodium citrate containing 0.01% TWEEN® 20.
Beta-xylosidase: The term “beta-xylosidase” means a beta-D-xyloside xylohydrolase (E.C. 3.2.1.37) that catalyzes the exo-hydrolysis of short beta (1→4)-xylooligosaccharides to remove successive D-xylose residues from non-reducing termini. For purposes of the present invention, one unit of beta-xylosidase is defined as 1.0 micromole of p-nitrophenolate anion produced per minute at 40° C., pH 5 from 1 mM p-nitrophenyl-beta-D-xyloside as substrate in 100 mM sodium citrate containing 0.01% TWEEN® 20.
cDNA: The term “cDNA” means a DNA molecule that can be prepared by reverse transcription from a mature, spliced, mRNA molecule obtained from a eukaryotic or prokaryotic cell. cDNA lacks intron sequences that may be present in the corresponding genomic DNA. The initial, primary RNA transcript is a precursor to mRNA that is processed through a series of steps, including splicing, before appearing as mature spliced mRNA.
Cellobiohydrolase: The term “cellobiohydrolase” means a 1,4-beta-D-glucan cellobiohydrolase (E.C. 3.2.1.91) that catalyzes the hydrolysis of 1,4-beta-D-glucosidic linkages in cellulose, cellooligosaccharides, or any beta-1,4-linked glucose containing polymer, releasing cellobiose from the reducing or non-reducing ends of the chain (Teeri, 1997, Crystalline cellulose degradation: New insight into the function of cellobiohydrolases, Trends in Biotechnology 15: 160-167; Teen et al., 1998, Trichoderma reesei cellobiohydrolases: why so efficient on crystalline cellulose?, Biochem. Soc. Trans. 26: 173-178). Cellobiohydrolase activity is determined according to the procedures described by Lever et al., 1972, Anal. Biochem. 47: 273-279; van Tilbeurgh et al., 1982, FEBS Letters, 149: 152-156; van Tilbeurgh and Claeyssens, 1985, FEBS Letters, 187: 283-288; and Tomme et al., 1988, Eur. J. Biochem. 170: 575-581. In the present invention, the Tomme et al. method can be used to determine cellobiohydrolase activity.
Cellulosic material: The term “cellulosic material” means any material containing cellulose. The predominant polysaccharide in the primary cell wall of biomass is cellulose, the second most abundant is hemicellulose, and the third is pectin. The secondary cell wall, produced after the cell has stopped growing, also contains polysaccharides and is strengthened by polymeric lignin covalently cross-linked to hemicellulose. Cellulose is a homopolymer of anhydrocellobiose and thus a linear beta-(1-4)-D-glucan, while hemicelluloses include a variety of compounds, such as xylans, xyloglucans, arabinoxylans, and mannans in complex branched structures with a spectrum of substituents. Although generally polymorphous, cellulose is found in plant tissue primarily as an insoluble crystalline matrix of parallel glucan chains. Hemicelluloses usually hydrogen bond to cellulose, as well as to other hemicelluloses, which help stabilize the cell wall matrix.
Cellulose is generally found, for example, in the stems, leaves, hulls, husks, and cobs of plants or leaves, branches, and wood of trees. The cellulosic material can be, but is not limited to, agricultural residue, herbaceous material (including energy crops), municipal solid waste, pulp and paper mill residue, waste paper, and wood (including forestry residue) (see, for example, Wiselogel et al., 1995, in Handbook on Bioethanol (Charles E. Wyman, editor), pp. 105-118, Taylor & Francis, Washington D.C.; Wyman, 1994, Bioresource Technology 50: 3-16; Lynd, 1990, Applied Biochemistry and Biotechnology 24/25: 695-719; Mosier et al., 1999, Recent Progress in Bioconversion of Lignocellulosics, in Advances in Biochemical Engineering/Biotechnology , T. Scheper, managing editor, Volume 65, pp. 23-40, Springer-Verlag, New York). It is understood herein that the cellulose may be in the form of lignocellulose, a plant cell wall material containing lignin, cellulose, and hemicellulose in a mixed matrix. In a preferred aspect, the cellulosic material is any biomass material. In another preferred aspect, the cellulosic material is lignocellulose, which comprises cellulose, hemicelluloses, and lignin.
In one aspect, the cellulosic material is agricultural residue. In another aspect, the cellulosic material is herbaceous material (including energy crops). In another aspect, the cellulosic material is municipal solid waste. In another aspect, the cellulosic material is pulp and paper mill residue. In another aspect, the cellulosic material is waste paper. In another aspect, the cellulosic material is wood (including forestry residue).
In another aspect, the cellulosic material is arundo. In another aspect, the cellulosic material is bagasse. In another aspect, the cellulosic material is bamboo. In another aspect, the cellulosic material is corn cob. In another aspect, the cellulosic material is corn fiber. In another aspect, the cellulosic material is corn stover. In another aspect, the cellulosic material is miscanthus. In another aspect, the cellulosic material is orange peel. In another aspect, the cellulosic material is rice straw. In another aspect, the cellulosic material is switchgrass. In another aspect, the cellulosic material is wheat straw.
In another aspect, the cellulosic material is aspen. In another aspect, the cellulosic material is eucalyptus. In another aspect, the cellulosic material is fir. In another aspect, the cellulosic material is pine. In another aspect, the cellulosic material is poplar. In another aspect, the cellulosic material is spruce. In another aspect, the cellulosic material is willow.
In another aspect, the cellulosic material is algal cellulose. In another aspect, the cellulosic material is bacterial cellulose. In another aspect, the cellulosic material is cotton linter.
In another aspect, the cellulosic material is filter paper. In another aspect, the cellulosic material is microcrystalline cellulose. In another aspect, the cellulosic material is phosphoric-acid treated cellulose.
In another aspect, the cellulosic material is an aquatic biomass. As used herein the term “aquatic biomass” means biomass produced in an aquatic environment by a photosynthesis process. The aquatic biomass can be algae, emergent plants, floating-leaf plants, or submerged plants.
The cellulosic material may be used as is or may be subjected to pretreatment, using conventional methods known in the art, as described herein. In a preferred aspect, the cellulosic material is pretreated.
Cellulolytic enzyme or cellulase: The term “cellulolytic enzyme” or “cellulase” means one or more (e.g., several) enzymes that hydrolyze a cellulosic material. Such enzymes include endoglucanase(s), cellobiohydrolase(s), beta-glucosidase(s), or combinations thereof. The two basic approaches for measuring cellulolytic activity include: (1) measuring the total cellulolytic activity, and (2) measuring the individual cellulolytic activities (endoglucanases, cellobiohydrolases, and beta-glucosidases) as reviewed in Zhang et al., Outlook for cellulase improvement: Screening and selection strategies, 2006, Biotechnology Advances 24: 452-481. Total cellulolytic activity is usually measured using insoluble substrates, including Whatman No 1 filter paper, microcrystalline cellulose, bacterial cellulose, algal cellulose, cotton, pretreated lignocellulose, etc. The most common total cellulolytic activity assay is the filter paper assay using Whatman No 1 filter paper as the substrate. The assay was established by the International Union of Pure and Applied Chemistry (IUPAC) (Ghose, 1987, Measurement of cellulase activities, Pure Appl. Chem. 59: 257-68).
For purposes of the present invention, cellulolytic enzyme activity is determined by measuring the increase in hydrolysis of a cellulosic material by cellulolytic enzyme(s) under the following conditions: 1-50 mg of cellulolytic enzyme protein/g of cellulose in PCS (or other pretreated cellulosic material) for 3-7 days at a suitable temperature, e.g., 50° C., 55° C., or 60° C., compared to a control hydrolysis without addition of cellulolytic enzyme protein. Typical conditions are 1 ml reactions, washed or unwashed PCS, 5% insoluble solids, 50 mM sodium acetate pH 5, 1 mM MnSO 4 , 50° C., 55° C., or 60° C., 72 hours, sugar analysis by AMINEX® HPX-87H column (Bio-Rad Laboratories, Inc., Hercules, Calif., USA).
Coding sequence: The term “coding sequence” means a polynucleotide, which directly specifies the amino acid sequence of a polypeptide. The boundaries of the coding sequence are generally determined by an open reading frame, which begins with a start codon such as ATG, GTG, or TTG and ends with a stop codon such as TAA, TAG, or TGA. The coding sequence may be a genomic DNA, cDNA, synthetic DNA, or a combination thereof.
Control sequences: The term “control sequences” means nucleic acid sequences necessary for expression of a polynucleotide encoding a mature polypeptide of the present invention. Each control sequence may be native (i.e., from the same gene) or foreign (i.e., from a different gene) to the polynucleotide encoding the polypeptide or native or foreign to each other. Such control sequences include, but are not limited to, a leader, polyadenylation sequence, propeptide sequence, promoter, signal peptide sequence, and transcription terminator. At a minimum, the control sequences include a promoter, and transcriptional and translational stop signals. The control sequences may be provided with linkers for the purpose of introducing specific restriction sites facilitating ligation of the control sequences with the coding region of the polynucleotide encoding a polypeptide.
Endoglucanase: The term “endoglucanase” means an endo-1,4-(1,3;1,4)-beta-D-glucan 4-glucanohydrolase (E.C. 3.2.1.4) that catalyzes endohydrolysis of 1,4-beta-D-glycosidic linkages in cellulose, cellulose derivatives (such as carboxymethyl cellulose and hydroxyethyl cellulose), lichenin, beta-1,4 bonds in mixed beta-1,3 glucans such as cereal beta-D-glucans or xyloglucans, and other plant material containing cellulosic components. Endoglucanase activity can be determined by measuring reduction in substrate viscosity or increase in reducing ends determined by a reducing sugar assay (Zhang et al., 2006, Biotechnology Advances 24: 452-481). For purposes of the present invention, endoglucanase activity is determined using carboxymethyl cellulose (CMC) as substrate according to the procedure of Ghose, 1987, Pure and Appl. Chem. 59: 257-268, at pH 5, 40° C.
Expression: The term “expression” includes any step involved in the production of a polypeptide including, but not limited to, transcription, post-transcriptional modification, translation, post-translational modification, and secretion.
Expression vector: The term “expression vector” means a linear or circular DNA molecule that comprises a polynucleotide encoding a polypeptide and is operably linked to control sequences that provide for its expression.
Family 61 glycoside hydrolase: The term “Family 61 glycoside hydrolase” or “Family GH61” or “GH61” means a polypeptide falling into the glycoside hydrolase Family 61 according to Henrissat, 1991, A classification of glycosyl hydrolases based on amino-acid sequence similarities, Biochem. J. 280: 309-316, and Henrissat and Bairoch, 1996, Updating the sequence-based classification of glycosyl hydrolases, Biochem. J. 316: 695-696. The enzymes in this family were originally classified as a glycoside hydrolase family based on measurement of very weak endo-1,4-beta-D-glucanase activity in one family member. The structure and mode of action of these enzymes are non-canonical and they cannot be considered as bona fide glycosidases. However, they are kept in the CAZy classification on the basis of their capacity to enhance the breakdown of lignocellulose when used in conjunction with a cellulase or a mixture of cellulases.
Feruloyl esterase: The term “feruloyl esterase” means a 4-hydroxy-3-methoxycinnamoyl-sugar hydrolase (EC 3.1.1.73) that catalyzes the hydrolysis of 4-hydroxy-3-methoxycinnamoyl (feruloyl) groups from esterified sugar, which is usually arabinose in “natural” substrates, to produce ferulate (4-hydroxy-3-methoxycinnamate). Feruloyl esterase is also known as ferulic acid esterase, hydroxycinnamoyl esterase, FAE-III, cinnamoyl ester hydrolase, FAEA, cinnAE, FAE-I, or FAE-II. For purposes of the present invention, feruloyl esterase activity is determined using 0.5 mM p-nitrophenylferulate as substrate in 50 mM sodium acetate pH 5.0. One unit of feruloyl esterase equals the amount of enzyme capable of releasing 1 micromole of p-nitrophenolate anion per minute at pH 5, 25° C.
Fragment: The term “fragment” means a polypeptide having one or more (e.g., several) amino acids absent from the amino and/or carboxyl terminus of a mature polypeptide main; wherein the fragment has xylanase activity. In one aspect, a fragment contains at least 20 amino acid residues, e.g., at least 30 to 348 amino acid residues or at least 50 to 340, 80 to 310, 100 to 290, 150 to 270, or 200 to 250, or any number in between, amino acid residues of SEQ ID NO: 2. In another aspect, a fragment contains at least 20 amino acid residues, e.g., at least 30 to 365 amino acid residues or at least 50 to 360, 80 to 330, 100 to 300, 150 to 270, or 200 to 250, or any number in between, amino acid residues of SEQ ID NO: 4. In another aspect, a fragment contains at least 20 amino acid residues, e.g., at least 30 to 375 amino acid residues or at least 50 to 370, 80 to 350, 100 to 320, 150 to 300, or 200 to 250, or any number in between, amino acid residues of SEQ ID NO: 6. In another aspect, a fragment contains at least 20 amino acid residues, e.g., at least 30 to 405 amino acid residues or at least 50 to 400, 80 to 370, 100 to 340, 150 to 300, or 200 to 250, or any number in between, amino acid residues of SEQ ID NO: 8. In another aspect, a fragment contains at least 20 amino acid residues, e.g., at least 30 to 395 amino acid residues or at least 50 to 390, 80 to 360, 100 to 340, 150 to 300, or 200 to 250, or any number in between, amino acid residues of SEQ ID NO: 10.
Hemicellulolytic enzyme or hemicellulase: The term “hemicellulolytic enzyme” or “hemicellulase” means one or more (e.g., several) enzymes that hydrolyze a hemicellulosic material. See, for example, Shallom and Shoham, 2003, Microbial hemicellulases. Current Opinion In Microbiology 6(3): 219-228). Hemicellulases are key components in the degradation of plant biomass. Examples of hemicellulases include, but are not limited to, an acetylmannan esterase, an acetylxylan esterase, an arabinanase, an arabinofuranosidase, a coumaric acid esterase, a feruloyl esterase, a galactosidase, a glucuronidase, a glucuronoyl esterase, a mannanase, a mannosidase, a xylanase, and a xylosidase. The substrates of these enzymes, the hemicelluloses, are a heterogeneous group of branched and linear polysaccharides that are bound via hydrogen bonds to the cellulose microfibrils in the plant cell wall, crosslinking them into a robust network. Hemicelluloses are also covalently attached to lignin, forming together with cellulose a highly complex structure. The variable structure and organization of hemicelluloses require the concerted action of many enzymes for its complete degradation. The catalytic modules of hemicellulases are either glycoside hydrolases (GHs) that hydrolyze glycosidic bonds, or carbohydrate esterases (CEs), which hydrolyze ester linkages of acetate or ferulic acid side groups. These catalytic modules, based on homology of their primary sequence, can be assigned into GH and CE families. Some families, with an overall similar fold, can be further grouped into clans, marked alphabetically (e.g., GH-A). A most informative and updated classification of these and other carbohydrate active enzymes is available in the Carbohydrate-Active Enzymes (CAZy) database. Hemicellulolytic enzyme activities can be measured according to Ghose and Bisaria, 1987, Pure & Appl. Chem. 59: 1739-1752, at a suitable temperature, e.g., 50° C., 55° C., or 60° C., and pH, e.g., 5.0 or 5.5.
High stringency conditions: The term “high stringency conditions” means for probes of at least 100 nucleotides in length, prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml sheared and denatured salmon sperm DNA, and 50% formamide, following standard Southern blotting procedures for 12 to 24 hours. The carrier material is finally washed three times each for 15 minutes using 2×SSC, 0.2% SDS at 65° C.
Host cell: The term “host cell” means any cell type that is susceptible to transformation, transfection, transduction, or the like with a nucleic acid construct or expression vector comprising a polynucleotide of the present invention. The term “host cell” encompasses any progeny of a parent cell that is not identical to the parent cell due to mutations that occur during replication.
Isolated: The term “isolated” means a substance in a form or environment that does not occur in nature. Non-limiting examples of isolated substances include (1) any non-naturally occurring substance, (2) any substance including, but not limited to, any enzyme, variant, nucleic acid, protein, peptide or cofactor, that is at least partially removed from one or more or all of the naturally occurring constituents with which it is associated in nature; (3) any substance modified by the hand of man relative to that substance found in nature; or (4) any substance modified by increasing the amount of the substance relative to other components with which it is naturally associated (e.g., multiple copies of a gene encoding the substance; use of a stronger promoter than the promoter naturally associated with the gene encoding the substance). An isolated substance may be present in a fermentation broth sample.
Low stringency conditions: The term “low stringency conditions” means for probes of at least 100 nucleotides in length, prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml sheared and denatured salmon sperm DNA, and 25% formamide, following standard Southern blotting procedures for 12 to 24 hours. The carrier material is finally washed three times each for 15 minutes using 2×SSC, 0.2% SDS at 50° C.
Mature polypeptide: The term “mature polypeptide” means a polypeptide in its final form following translation and any post-translational modifications, such as N-terminal processing, C-terminal truncation, glycosylation, phosphorylation, etc. In one aspect, the mature polypeptide is amino acids 18 to 349 of SEQ ID NO: 2 based on the SignalP program (Nielsen et al., 1997, Protein Engineering 10:1-6) that predicts amino acids 1 to 17 of SEQ ID NO: 2 are a signal peptide. In another aspect, the mature polypeptide is amino acids 1 to 349 of SEQ ID NO: 2. In another aspect, the mature polypeptide is amino acids 21 to 343 of SEQ ID NO: 4 based on the SignalP program that predicts amino acids 1 to 20 of SEQ ID NO: 4 are a signal peptide. In another aspect, the mature polypeptide is amino acids 1 to 343 of SEQ ID NO: 4. In another aspect, the mature polypeptide is amino acids 21 to 376 of SEQ ID NO: 6 based on the SignalP program that predicts amino acids 1 to 20 of SEQ ID NO: 6 are a signal peptide. In another aspect, the mature polypeptide is amino acids 1 to 376 of SEQ ID NO: 6. In another aspect, the mature polypeptide is amino acids 20 to 404 of SEQ ID NO: 8 based on the SignalP program that predicts amino acids 1 to 19 of SEQ ID NO: 8 are a signal peptide. In another aspect, the mature polypeptide is amino acids 1 to 404 of SEQ ID NO: 8. In another aspect, the mature polypeptide is amino acids 20 to 396 of SEQ ID NO: 10 based on the SignalP program that predicts amino acids 1 to 19 of SEQ ID NO: 10 are a signal peptide. In another aspect, the mature polypeptide is amino acids 1 to 396 of SEQ ID NO: 10. It is known in the art that a host cell may produce a mixture of two of more different mature polypeptides (i.e., with a different C-terminal and/or N-terminal amino acid) expressed by the same polynucleotide.
Mature polypeptide coding sequence: The term “mature polypeptide coding sequence” means a polynucleotide that encodes a mature polypeptide having xylanase activity.
In one aspect, the mature polypeptide coding sequence is nucleotides 52 to 1383 of SEQ ID NO: 1 or the cDNA sequence thereof based on the SignalP program (Nielsen et al., 1997, supra) that predicts nucleotides 1 to 51 of SEQ ID NO: 1 encode a signal peptide. In another aspect, the mature polypeptide coding sequence is nucleotides 1 to 1383 of SEQ ID NO: 1 or the cDNA sequence thereof. In another aspect, the mature polypeptide coding sequence is nucleotides 61 to 1383 of SEQ ID NO: 3 or the cDNA sequence thereof based on the SignalP program that predicts nucleotides 1 to 60 of SEQ ID NO: 3 encode a signal peptide. In another aspect, the mature polypeptide coding sequence is nucleotides 1 to 1383 of SEQ ID NO: 3 or the cDNA sequence thereof. In another aspect, the mature polypeptide coding sequence is nucleotides 61 to 1843 of SEQ ID NO: 5 or the cDNA sequence thereof based on the SignalP program that predicts nucleotides 1 to 60 of SEQ ID NO: 5 encode a signal peptide. In another aspect, the mature polypeptide coding sequence is nucleotides 1 to 1843 of SEQ ID NO: 5 or the cDNA sequence thereof. In another aspect, the mature polypeptide coding sequence is nucleotides 58 to 1762 of SEQ ID NO: 7 or the cDNA sequence thereof based on the SignalP program that predicts nucleotides 1 to 57 of SEQ ID NO: 7 encode a signal peptide. In another aspect, the mature polypeptide coding sequence is nucleotides 1 to 1762 of SEQ ID NO: 7 or the cDNA sequence thereof. In another aspect, the mature polypeptide coding sequence is nucleotides 58 to 1727 of SEQ ID NO: 9 or the cDNA sequence thereof based on the SignalP program that predicts nucleotides 1 to 57 of SEQ ID NO: 9 encode a signal peptide. In another aspect, the mature polypeptide coding sequence is nucleotides 1 to 1727 of SEQ ID NO: 9 or the cDNA sequence thereof.
Catalytic domain: The term “catalytic domain” means the portion of an enzyme containing the catalytic machinery of the enzyme.
Cellulose binding domain: The term “cellulose binding domain” means the portion of an enzyme that mediates binding of the enzyme to amorphous regions of a cellulose substrate. The cellulose binding domain (CBD) is found either at the N-terminal or at the C-terminal extremity of an enzyme. A CBD is also referred to as a cellulose binding module or CBM. In one embodiment the CBM is amino acids 21 to 55 of SEQ ID NO: 6. In one embodiment the CBM is amino acids 20 to 56 of SEQ ID NO: 8. In one embodiment the CBM is amino acids 20 to 56 of SEQ ID NO: 10. The CBM is separated from the catalytic domain by a linker sequence. The linker is in one embodiment amino acids 56 to 80 of SEQ ID NO: 6. The linker is in one embodiment amino acids 57 to 85 of SEQ ID NO: 8. The linker is in one embodiment amino acids 57 to 81 of SEQ ID NO: 10.
Medium stringency conditions: The term “medium stringency conditions” means for probes of at least 100 nucleotides in length, prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml sheared and denatured salmon sperm DNA, and 35% formamide, following standard Southern blotting procedures for 12 to 24 hours. The carrier material is finally washed three times each for 15 minutes using 2×SSC, 0.2% SDS at 55° C.
Medium-high stringency conditions: The term “medium-high stringency conditions” means for probes of at least 100 nucleotides in length, prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml sheared and denatured salmon sperm DNA, and either 35% formamide, following standard Southern blotting procedures for 12 to 24 hours. The carrier material is finally washed three times each for 15 minutes using 2×SSC, 0.2% SDS at 60° C.
Nucleic acid construct: The term “nucleic acid construct” means a nucleic acid molecule, either single- or double-stranded, which is isolated from a naturally occurring gene or is modified to contain segments of nucleic acids in a manner that would not otherwise exist in nature or which is synthetic, which comprises one or more control sequences.
Operably linked: The term “operably linked” means a configuration in which a control sequence is placed at an appropriate position relative to the coding sequence of a polynucleotide such that the control sequence directs expression of the coding sequence.
Polypeptide having cellulolytic enhancing activity: The term “polypeptide having cellulolytic enhancing activity” means a GH61 polypeptide that catalyzes the enhancement of the hydrolysis of a cellulosic material by enzyme having cellulolytic activity. For purposes of the present invention, cellulolytic enhancing activity is determined by measuring the increase in reducing sugars or the increase of the total of cellobiose and glucose from the hydrolysis of a cellulosic material by cellulolytic enzyme under the following conditions: 1-50 mg of total protein/g of cellulose in PCS, wherein total protein is comprised of 50-99.5% w/w cellulolytic enzyme protein and 0.5-50% w/w protein of a GH61 polypeptide having cellulolytic enhancing activity for 1-7 days at a suitable temperature, e.g., 50° C., 55° C., or 60° C., and pH, e.g., 5.0 or 5.5, compared to a control hydrolysis with equal total protein loading without cellulolytic enhancing activity (1-50 mg of cellulolytic protein/g of cellulose in PCS). In a preferred aspect, a mixture of CELLUCLAST® 1.5 L (Novozymes A/S, Bagsvaerd, Denmark) in the presence of 2-3% of total protein weight Aspergillus oryzae beta-glucosidase (recombinantly produced in Aspergillus oryzae according to WO 02/95014) or 2-3% of total protein weight Aspergillus fumigatus beta-glucosidase (recombinantly produced in Aspergillus oryzae as described in WO 2002/095014) of cellulase protein loading is used as the source of the cellulolytic activity.
The GH61 polypeptides having cellulolytic enhancing activity enhance the hydrolysis of a cellulosic material catalyzed by enzyme having cellulolytic activity by reducing the amount of cellulolytic enzyme required to reach the same degree of hydrolysis preferably at least 1.01-fold, e.g., at least 1.05-fold, at least 1.10-fold, at least 1.25-fold, at least 1.5-fold, at least 2-fold, at least 3-fold, at least 4-fold, at least 5-fold, at least 10-fold, or at least 20-fold.
Pretreated corn stover: The term “PCS” or “Pretreated Corn Stover” means a cellulosic material derived from corn stover by treatment with heat and dilute sulfuric acid, alkaline pretreatment, or neutral pretreatment.
Sequence identity: The relatedness between two amino acid sequences or between two nucleotide sequences is described by the parameter “sequence identity”.
For purposes of the present invention, the sequence identity between two amino acid sequences is determined using the Needleman-Wunsch algorithm (Needleman and Wunsch, 1970, J. Mol. Biol. 48: 443-453) as implemented in the Needle program of the EMBOSS package (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al., 2000, Trends Genet. 16: 276-277), preferably version 5.0.0 or later. The parameters used are gap open penalty of 10, gap extension penalty of 0.5, and the EBLOSUM62 (EMBOSS version of BLOSUM62) substitution matrix. The output of Needle labeled “longest identity” (obtained using the—nobrief option) is used as the percent identity and is calculated as follows:
(Identical Residues×100)/(Length of Alignment−Total Number of Gaps in Alignment)

For purposes of the present invention, the sequence identity between two deoxyribonucleotide sequences is determined using the Needleman-Wunsch algorithm (Needleman and Wunsch, 1970, supra) as implemented in the Needle program of the EMBOSS package (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al., 2000, supra), preferably version 5.0.0 or later. The parameters used are gap open penalty of 10, gap extension penalty of 0.5, and the EDNAFULL (EMBOSS version of NCBI NUC4.4) substitution matrix. The output of Needle labeled “longest identity” (obtained using the—nobrief option) is used as the percent identity and is calculated as follows:
(Identical Deoxyribonucleotides×100)/(Length of Alignment−Total Number of Gaps in Alignment)

Subsequence: The term “subsequence” means a polynucleotide having one or more (e.g., several) nucleotides absent from the 5′ and/or 3′ end of a mature polypeptide coding sequence; wherein the subsequence encodes a fragment having xylanase activity. In one aspect, a subsequence contains at least 800 nucleotides, e.g., at least 1000 nucleotides or at least 1100 nucleotides of SEQ ID NO: 1. In another aspect, a subsequence contains at least 800 nucleotides, e.g., at least 1000 nucleotides or at least 1100 nucleotides of SEQ ID NO: 3. In another aspect, a subsequence contains at least 1000 nucleotides, e.g., at least 1200 nucleotides or at least 1500 nucleotides of SEQ ID NO: 5. In another aspect, a subsequence contains at least 1000 nucleotides, e.g., at least 1200 nucleotides or at least 1500 nucleotides of SEQ ID NO: 7. In another aspect, a subsequence contains at least 1000 nucleotides, e.g., at least 1200 nucleotides or at least 1500 nucleotides of SEQ ID NO: 9.
Variant: The term “variant” means a polypeptide having xylanase activity comprising an alteration, i.e., a substitution, insertion, and/or deletion, at one or more (e.g., several) positions. A substitution means replacement of the amino acid occupying a position with a different amino acid; a deletion means removal of the amino acid occupying a position; and an insertion means adding an amino acid adjacent to and immediately following the amino acid occupying a position.
Very high stringency conditions: The term “very high stringency conditions” means for probes of at least 100 nucleotides in length, prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml sheared and denatured salmon sperm DNA, and 50% formamide, following standard Southern blotting procedures for 12 to 24 hours. The carrier material is finally washed three times each for 15 minutes using 2×SSC, 0.2% SDS at 70° C.
Very low stringency conditions: The term “very low stringency conditions” means for probes of at least 100 nucleotides in length, prehybridization and hybridization at 42° C. in 5×SSPE, 0.3% SDS, 200 micrograms/ml sheared and denatured salmon sperm DNA, and 25% formamide, following standard Southern blotting procedures for 12 to 24 hours. The carrier material is finally washed three times each for 15 minutes using 2×SSC, 0.2% SDS at 45° C.
Xylan-containing material: The term “xylan-containing material” means any material comprising a plant cell wall polysaccharide containing a backbone of beta-(1-4)-linked xylose residues. Xylans of terrestrial plants are heteropolymers possessing a beta-(1-4)-D-xylopyranose backbone, which is branched by short carbohydrate chains. They comprise D-glucuronic acid or its 4-O-methyl ether, L-arabinose, and/or various oligosaccharides, composed of D-xylose, L-arabinose, D- or L-galactose, and D-glucose. Xylan-type polysaccharides can be divided into homoxylans and heteroxylans, which include glucuronoxylans, (arabino)glucuronoxylans, (glucurono)arabinoxylans, arabinoxylans, and complex heteroxylans. See, for example, Ebringerova et al., 2005, Adv. Polym. Sci. 186: 1-67.
In the processes of the present invention, any material containing xylan may be used. In a preferred aspect, the xylan-containing material is lignocellulose.
Xylan degrading activity or xylanolytic activity: The term “xylan degrading activity” or “xylanolytic activity” means a biological activity that hydrolyzes xylan-containing material. The two basic approaches for measuring xylanolytic activity include: (1) measuring the total xylanolytic activity, and (2) measuring the individual xylanolytic activities (e.g., endoxylanases, beta-xylosidases, arabinofuranosidases, alpha-glucuronidases, acetylxylan esterases, feruloyl esterases, and alpha-glucuronyl esterases). Recent progress in assays of xylanolytic enzymes was summarized in several publications including Biely and Puchard, 2006, Recent progress in the assays of xylanolytic enzymes, Journal of the Science of Food and Agriculture 86(11): 1636-1647; Spanikova and Biely, 2006, Glucuronoyl esterase-Novel carbohydrate esterase produced by Schizophyllum commune, FEBS Letters 580(19): 4597-4601; Herrmann et al., 1997, The beta-D-xylosidase of Trichoderma reesei is a multifunctional beta-D-xylan xylohydrolase, Biochemical Journal 321: 375-381.
Total xylan degrading activity can be measured by determining the reducing sugars formed from various types of xylan, including, for example, oat spelt, beechwood, and larchwood xylans, or by photometric determination of dyed xylan fragments released from various covalently dyed xylans. The most common total xylanolytic activity assay is based on production of reducing sugars from polymeric 4-O-methyl glucuronoxylan as described in Bailey, Biely, Poutanen, 1992, Interlaboratory testing of methods for assay of xylanase activity, Journal of Biotechnology 23(3): 257-270. Xylanase activity can also be determined with 0.2% AZCL-arabinoxylan as substrate in 0.01% TRITON® X-100 (4-(1,1,3,3-tetramethylbutyl)phenyl-polyethylene glycol) and 200 mM sodium phosphate buffer pH 6 at 37° C. One unit of xylanase activity is defined as 1.0 micromole of azurine produced per minute at 37° C., pH 6 from 0.2% AZCL-arabinoxylan as substrate in 200 mM sodium phosphate pH 6 buffer.
For purposes of the present invention, xylan degrading activity is determined by measuring the increase in hydrolysis of birchwood xylan (Sigma Chemical Co., Inc., St. Louis, Mo., USA) by xylan-degrading enzyme(s) under the following typical conditions: 1 ml reactions, 5 mg/ml substrate (total solids), 5 mg of xylanolytic protein/g of substrate, 50 mM sodium acetate pH 5, 50° C., 24 hours, sugar analysis using p-hydroxybenzoic acid hydrazide (PHBAH) assay as described by Lever, 1972, A new reaction for colorimetric determination of carbohydrates, Anal. Biochem 47: 273-279.


DETAILED DESCRIPTION OF THE INVENTION
Polypeptides Having Xylanase Activity
In an embodiment, the present invention relates to isolated polypeptides having a sequence identity to the mature polypeptide of SEQ ID NO: 2 of at least 77%, e.g., at least 78%, at least 79%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, which have xylanase activity. In an embodiment, the present invention relates to isolated polypeptides having a sequence identity to the mature polypeptide of SEQ ID NO: 4 of at least 77%, e.g., at least 78%, at least 79%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, which have xylanase activity. In an embodiment, the present invention relates to isolated polypeptides having a sequence identity to the mature polypeptide of SEQ ID NO: 6 of at least 81%, e.g., at least 82%, at least 83%, at least 84%, at least 85%, at least 86%, at least 87%, at least 88%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, which have xylanase activity. In an embodiment, the present invention relates to isolated polypeptides having a sequence identity to the mature polypeptide of SEQ ID NO: 8 of at least 68%, e.g., at least 69%, at least 70%, at least 75%, at least 80%, at least 85%, at least 87%, at least 88%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, which have xylanase activity. In an embodiment, the present invention relates to isolated polypeptides having a sequence identity to the mature polypeptide of SEQ ID NO: 10 of at least 74%, e.g., at least 75%, at least 76%, at least 77%, at least 80%, at least 85%, at least 87%, at least 88%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, which have xylanase activity. In one aspect, the polypeptides differ by no more than 10 amino acids, e.g., 1, 2, 3, 4, 5, 6, 7, 8, or 9, from the mature polypeptide of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10.
A polypeptide of the present invention preferably comprises or consists of the amino acid sequence of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10 or an allelic variant thereof; or is a fragment thereof having xylanase activity. In another aspect, the polypeptide comprises or consists of the mature polypeptide of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10. In another aspect, the polypeptide comprises or consists of amino acids 18 to 349 of SEQ ID NO: 2, amino acids 21 to 343 of SEQ ID NO: 4, amino acids 21 to 376 of SEQ ID NO: 6, amino acids 20 to 404 of SEQ ID NO: 8, or amino acids 20 to 396 of SEQ ID NO: 10.
In another embodiment, the present invention relates to an isolated polypeptide having xylanase activity encoded by a polynucleotide that hybridizes under very low stringency conditions, or low stringency conditions, or medium stringency conditions, or medium-high stringency conditions, or high stringency conditions, or very high stringency conditions with (i) the mature polypeptide coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9, (ii) the cDNA sequence thereof, or (iii) the full-length complement of (i) or (ii) (Sambrook et al., 1989, Molecular Cloning, A Laboratory Manual, 2d edition, Cold Spring Harbor, N.Y.).
The polynucleotide of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9, or a subsequence thereof, as well as the polypeptide of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10, or a fragment thereof, may be used to design nucleic acid probes to identify and clone DNA encoding polypeptides having xylanase activity from strains of different genera or species according to methods well known in the art. In particular, such probes can be used for hybridization with the genomic DNA or cDNA of a cell of interest, following standard Southern blotting procedures, in order to identify and isolate the corresponding gene therein. Such probes can be considerably shorter than the entire sequence, but should be at least 15, e.g., at least 25, at least 35, or at least 70 nucleotides in length. Preferably, the nucleic acid probe is at least 100 nucleotides in length, e.g., at least 200 nucleotides, at least 300 nucleotides, at least 400 nucleotides, at least 500 nucleotides, at least 600 nucleotides, at least 700 nucleotides, at least 800 nucleotides, or at least 900 nucleotides in length. Both DNA and RNA probes can be used. The probes are typically labeled for detecting the corresponding gene (for example, with 32 P, 3 H, 35 5, biotin, or avidin). Such probes are encompassed by the present invention.
A genomic DNA or cDNA library prepared from such other strains may be screened for DNA that hybridizes with the probes described above and encodes a polypeptide having xylanase activity. Genomic or other DNA from such other strains may be separated by agarose or polyacrylamide gel electrophoresis, or other separation techniques. DNA from the libraries or the separated DNA may be transferred to and immobilized on nitrocellulose or other suitable carrier material. In order to identify a clone or DNA that hybridizes with SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9 or a subsequence thereof, the carrier material is used in a Southern blot.
For purposes of the present invention, hybridization indicates that the polynucleotide hybridizes to a labeled nucleic acid probe corresponding to (i) SEQ ID NO: 1, SEQ ID NO: 3,
SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9; (ii) the mature polypeptide coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9; (iii) the cDNA sequence thereof; (iv) the full-length complement thereof; or (v) a subsequence thereof; under very low to very high stringency conditions. Molecules to which the nucleic acid probe hybridizes under these conditions can be detected using, for example, X-ray film or any other detection means known in the art.
In one aspect, the nucleic acid probe is a polynucleotide that encodes the polypeptide of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10; the mature polypeptide thereof; or a fragment thereof. In another aspect, the nucleic acid probe is SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9; or the cDNA sequence thereof. In another aspect, the nucleic acid probe is the polynucleotide contained in Lentinus similis Strain NN048945, wherein the polynucleotide encodes a polypeptide having xylanase activity.
In another embodiment, the present invention relates to an isolated polypeptide having xylanase activity encoded by a polynucleotide having a sequence identity to the mature polypeptide coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9, or the cDNA sequence thereof, of at least 60%, e.g., at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%.
In another embodiment, the present invention relates to variants of the mature polypeptide of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10 comprising a substitution, deletion, and/or insertion at one or more (e.g., several) positions. In an embodiment, the number of amino acid substitutions, deletions and/or insertions introduced into the mature polypeptide of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10 is not more than 10, e.g., 1, 2, 3, 4, 5, 6, 7, 8 or 9. The amino acid changes may be of a minor nature, that is conservative amino acid substitutions or insertions that do not significantly affect the folding and/or activity of the protein; small deletions, typically of 1-30 amino acids; small amino- or carboxyl-terminal extensions, such as an amino-terminal methionine residue; a small linker peptide of up to 20-25 residues; or a small extension that facilitates purification by changing net charge or another function, such as a poly-histidine tract, an antigenic epitope or a binding domain.
Examples of conservative substitutions are within the groups of basic amino acids (arginine, lysine and histidine), acidic amino acids (glutamic acid and aspartic acid), polar amino acids (glutamine and asparagine), hydrophobic amino acids (leucine, isoleucine and valine), aromatic amino acids (phenylalanine, tryptophan and tyrosine), and small amino acids (glycine, alanine, serine, threonine and methionine). Amino acid substitutions that do not generally alter specific activity are known in the art and are described, for example, by H. Neurath and R. L. Hill, 1979, In, The Proteins , Academic Press, New York. Common substitutions are Ala/Ser, Val/Ile, Asp/Glu, Thr/Ser, Ala/Gly, Ala/Thr, Ser/Asn, Ala/Val, Ser/Gly, Tyr/Phe, Ala/Pro, Lys/Arg, Asp/Asn, Leu/Ile, Leu/Val, Ala/Glu, and Asp/Gly.
Alternatively, the amino acid changes are of such a nature that the physico-chemical properties of the polypeptides are altered. For example, amino acid changes may improve the thermal stability of the polypeptide, alter the substrate specificity, change the pH optimum, and the like.
Essential amino acids in a polypeptide can be identified according to procedures known in the art, such as site-directed mutagenesis or alanine-scanning mutagenesis (Cunningham and Wells, 1989, Science 244: 1081-1085). In the latter technique, single alanine mutations are introduced at every residue in the molecule, and the resultant mutant molecules are tested for xylanase activity to identify amino acid residues that are critical to the activity of the molecule. See also, Hilton et al., 1996, J. Biol. Chem. 271: 4699-4708. The active site of the enzyme or other biological interaction can also be determined by physical analysis of structure, as determined by such techniques as nuclear magnetic resonance, crystallography, electron diffraction, or photoaffinity labeling, in conjunction with mutation of putative contact site amino acids. See, for example, de Vos et al., 1992, Science 255: 306-312; Smith et al., 1992, J. Mol. Biol. 224: 899-904; Wlodaver et al., 1992, FEBS Lett. 309: 59-64. The identity of essential amino acids can also be inferred from an alignment with a related polypeptide.
Single or multiple amino acid substitutions, deletions, and/or insertions can be made and tested using known methods of mutagenesis, recombination, and/or shuffling, followed by a relevant screening procedure, such as those disclosed by Reidhaar-Olson and Sauer, 1988, Science 241: 53-57; Bowie and Sauer, 1989, Proc. Natl. Acad. Sci. USA 86: 2152-2156; WO 95/17413; or WO 95/22625. Other methods that can be used include error-prone PCR, phage display (e.g., Lowman et al., 1991, Biochemistry 30: 10832-10837; U.S. Pat. No. 5,223,409; WO 92/06204), and region-directed mutagenesis (Derbyshire et al., 1986, Gene 46: 145; Ner et al., 1988, DNA 7: 127).
Mutagenesis/shuffling methods can be combined with high-throughput, automated screening methods to detect activity of cloned, mutagenized polypeptides expressed by host cells (Ness et al., 1999, Nature Biotechnology 17: 893-896). Mutagenized DNA molecules that encode active polypeptides can be recovered from the host cells and rapidly sequenced using standard methods in the art. These methods allow the rapid determination of the importance of individual amino acid residues in a polypeptide.
The polypeptide may be a hybrid polypeptide in which a region of one polypeptide is fused at the N-terminus or the C-terminus of a region of another polypeptide.
The polypeptide may be a fusion polypeptide or cleavable fusion polypeptide in which another polypeptide is fused at the N-terminus or the C-terminus of the polypeptide of the present invention. A fusion polypeptide is produced by fusing a polynucleotide encoding another polypeptide to a polynucleotide of the present invention. Techniques for producing fusion polypeptides are known in the art, and include ligating the coding sequences encoding the polypeptides so that they are in frame and that expression of the fusion polypeptide is under control of the same promoter(s) and terminator. Fusion polypeptides may also be constructed using intein technology in which fusion polypeptides are created post-translationally (Cooper et al., 1993, EMBO J. 12: 2575-2583; Dawson et al., 1994, Science 266: 776-779).
A fusion polypeptide can further comprise a cleavage site between the two polypeptides. Upon secretion of the fusion protein, the site is cleaved releasing the two polypeptides. Examples of cleavage sites include, but are not limited to, the sites disclosed in Martin et al., 2003, J. Ind. Microbiol. Biotechnol. 3: 568-576; Svetina et al., 2000, J. Biotechnol. 76: 245-251; Rasmussen-Wilson et al., 1997, Appl. Environ. Microbiol. 63: 3488-3493; Ward et al., 1995, Biotechnology 13: 498-503; and Contreras et al., 1991, Biotechnology 9: 378-381; Eaton et al., 1986, Biochemistry 25: 505-512; Collins-Racie et al., 1995, Biotechnology 13: 982-987; Carter et al., 1989, Proteins: Structure, Function, and Genetics 6: 240-248; and Stevens, 2003, Drug Discovery World 4: 35-48.
Sources of Polypeptides Having Xylanase Activity
A polypeptide having xylanase activity of the present invention may be obtained from microorganisms of any genus. For purposes of the present invention, the term “obtained from” as used herein in connection with a given source shall mean that the polypeptide encoded by a polynucleotide is produced by the source or by a strain in which the polynucleotide from the source has been inserted. In one aspect, the polypeptide obtained from a given source is secreted extracellularly.
The polypeptide may be a Lentinus polypeptide.
In another aspect, the polypeptide is a Lentinus similis polypeptide, e.g., a polypeptide obtained from Lentinus similis Strain NN048945.
It will be understood that for the aforementioned species, the invention encompasses both the perfect and imperfect states, and other taxonomic equivalents, e.g., anamorphs, regardless of the species name by which they are known. Those skilled in the art will readily recognize the identity of appropriate equivalents.
Strains of these species are readily accessible to the public in a number of culture collections, such as the American Type Culture Collection (ATCC), Deutsche Sammlung von Mikroorganismen and Zellkulturen GmbH (DSMZ), Centraalbureau Voor Schimmelcultures (CBS), and Agricultural Research Service Patent Culture Collection, Northern Regional Research Center (NRRL).
The polypeptide may be identified and obtained from other sources including microorganisms isolated from nature (e.g., soil, composts, water, etc.) or DNA samples obtained directly from natural materials (e.g., soil, composts, water, etc.) using the above-mentioned probes. Techniques for isolating microorganisms and DNA directly from natural habitats are well known in the art. A polynucleotide encoding the polypeptide may then be obtained by similarly screening a genomic DNA or cDNA library of another microorganism or mixed DNA sample. Once a polynucleotide encoding a polypeptide has been detected with the probe(s), the polynucleotide can be isolated or cloned by utilizing techniques that are known to those of ordinary skill in the art (see, e.g., Sambrook et al., 1989, supra).
Catalytic Domains
The present invention also relates to isolated polypeptides comprising a catalytic domain selected from the group consisting of:
(a) a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 2 (for example, amino acids 18 to 349 of SEQ ID NO: 2), a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 4 (for example, amino acids 21 to 343 of SEQ ID NO: 4), a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 6 (for example, amino acids 81 to 376 of SEQ ID NO: 6), a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 8 (for example, amino acids 86 to 404 of SEQ ID NO: 8), or a catalytic domain having at least 60% sequence identity to the catalytic domain of SEQ ID NO: 10 (for example, amino acids 82 to 396 of SEQ ID NO: 10);
(b) a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 1 (for example, nucleotides 52-246, 300-390, 444-570, 624-625, 685-705, 764-1272, and 1333-1383 of SEQ ID NO: 1), a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 3 (for example, nucleotides 61-234, 300-390, 439-565, 751-1270, and 1327-1383 of SEQ ID NO: 3), a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 5 (for example, nucleotides 353-440, 493-548, 603-609, 667-756, 808-833, 885-980, 1037-1182, 1247-1355, 1408-1480, 1538-1557, 1613-1699, and 1754-1843 of SEQ ID NO: 5), a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 7 (for example, nucleotides 425-568, 633-723, 800-926, 980-985, 1043-1067, 1128-1640, and 1706-1762 of SEQ ID NO: 7), or a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO: 9 (for example, nucleotides 426-569, 635-725, 796-922, 977-978, 1041-1061, 1109-1617, and 1677-1727 of SEQ ID NO: 9);
(c) a variant of a catalytic domain comprising a substitution, deletion, and/or insertion of one or more (several) amino acids of the catalytic domain of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10; and
(d) a fragment of a catalytic domain of (a), (b), or (c), which has xylanase activity.
The catalytic domain preferably has a degree of sequence identity to the catalytic domain of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10 of at least 60%, e.g. at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%. In an aspect, the catalytic domain comprises an amino acid sequence that differs by ten amino acids, e.g., by five amino acids, by four amino acids, by three amino acids, by two amino acids, and by one amino acid from the catalytic domain of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6, SEQ ID NO: 8, or SEQ ID NO: 10.
The catalytic domain preferably comprises or consists of the catalytic domain of SEQ ID NO: 2 or an allelic variant thereof; or is a fragment thereof having xylanase activity. In another preferred aspect, the catalytic domain comprises or consists of amino acids 18 to 349 of SEQ ID NO: 2.
The catalytic domain preferably comprises or consists of the catalytic domain of SEQ ID NO: 4 or an allelic variant thereof; or is a fragment thereof having xylanase activity. In another preferred aspect, the catalytic domain comprises or consists of amino acids 21 to 343 of SEQ ID NO: 4.
The catalytic domain preferably comprises or consists of the catalytic domain of SEQ ID NO: 6 or an allelic variant thereof; or is a fragment thereof having xylanase activity. In another preferred aspect, the catalytic domain comprises or consists of amino acids 81 to 376 of SEQ ID NO: 6.
The catalytic domain preferably comprises or consists of the catalytic domain of SEQ ID NO: 8 or an allelic variant thereof; or is a fragment thereof having xylanase activity. In another preferred aspect, the catalytic domain comprises or consists of amino acids 86 to 404 of SEQ ID NO: 8.
The catalytic domain preferably comprises or consists of the catalytic domain of SEQ ID NO: 10 or an allelic variant thereof; or is a fragment thereof having xylanase activity. In another preferred aspect, the catalytic domain comprises or consists of amino acids 82 to 396 of SEQ ID NO: 10.
In an embodiment, the catalytic domain may be encoded by a polynucleotide that hybridizes under very low stringency conditions, or low stringency conditions, or medium stringency conditions, or medium-high stringency conditions, or high stringency conditions, or very high stringency conditions (as defined above) with (i) the catalytic domain coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9, (ii) the cDNA sequence contained in the catalytic domain coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9, or (iii) the full-length complementary strand of (i) or (ii) (Sambrook et al., 1989, supra).
The catalytic domain may be encoded by a polynucleotide having a degree of sequence identity to the catalytic domain coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9 of at least 60%, e.g. at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, which encode a polypeptide having xylanase activity.
In one aspect, the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 52 to 1383 of SEQ ID NO: 1 or the cDNA sequence thereof. In particular the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 52-246, 300-390, 444-570, 624-625, 685-705, 764-1272, and 1333-1383 of SEQ ID NO: 1.
In one aspect, the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 61 to 1383 of SEQ ID NO: 3 or the cDNA sequence thereof. In particular the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 61-234, 300-390, 439-565, 751-1270, and 1327-1383 of SEQ ID NO: 3.
In one aspect, the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 353 to 1843 of SEQ ID NO: 5 or the cDNA sequence thereof. In particular the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 353-440, 493-548, 603-609, 667-756, 808-833, 885-980, 1037-1182, 1247-1355, 1408-1480, 1538-1557, 1613-1699, and 1754-1843 of SEQ ID NO: 5.
In one aspect, the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 425 to 1762 of SEQ ID NO: 7 or the cDNA sequence thereof. In particular the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 425-568, 633-723, 800-926, 980-985, 1043-1067, 1128-1640, and 1706-1762 of SEQ ID NO: 7.
In one aspect, the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 426 to 1727 of SEQ ID NO: 9 or the cDNA sequence thereof. In particular the polynucleotide encoding the catalytic domain comprises or consists of nucleotides 426-569, 635-725, 796-922, 977-978, 1041-1061, 1109-1617, and 1677-1727 of SEQ ID NO: 9.
Polynucleotides
The present invention also relates to isolated polynucleotides encoding a polypeptide of the present invention, as described herein.
The techniques used to isolate or clone a polynucleotide are known in the art and include isolation from genomic DNA or cDNA, or a combination thereof. The cloning of the polynucleotides from genomic DNA can be effected, e.g., by using the well known polymerase chain reaction (PCR) or antibody screening of expression libraries to detect cloned DNA fragments with shared structural features. See, e.g., Innis et al., 1990, PCR: A Guide to Methods and Application , Academic Press, New York. Other nucleic acid amplification procedures such as ligase chain reaction (LCR), ligation activated transcription (LAT) and polynucleotide-based amplification (NASBA) may be used. The polynucleotides may be cloned from a strain of Lentinus , or a related organism and thus, for example, may be an allelic or species variant of the polypeptide encoding region of the polynucleotide.
Modification of a polynucleotide encoding a polypeptide of the present invention may be necessary for synthesizing polypeptides substantially similar to the polypeptide. The term “substantially similar” to the polypeptide refers to non-naturally occurring forms of the polypeptide. These polypeptides may differ in some engineered way from the polypeptide isolated from its native source, e.g., variants that differ in specific activity, thermostability, pH optimum, or the like. The variants may be constructed on the basis of the polynucleotide presented as the mature polypeptide coding sequence of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7, or SEQ ID NO: 9, or the cDNA sequence thereof, e.g., a subsequence thereof, and/or by introduction of nucleotide substitutions that do not result in a change in the amino acid sequence of the polypeptide, but which correspond to the codon usage of the host organism intended for production of the enzyme, or by introduction of nucleotide substitutions that may give rise to a different amino acid sequence. For a general description of nucleotide substitution, see, e.g., Ford et al., 1991, Protein Expression and Purification 2: 95-107.
Nucleic Acid Constructs
The present invention also relates to nucleic acid constructs comprising a polynucleotide of the present invention operably linked to one or more control sequences that direct the expression of the coding sequence in a suitable host cell under conditions compatible with the control sequences.
A polynucleotide may be manipulated in a variety of ways to provide for expression of the polypeptide. Manipulation of the polynucleotide prior to its insertion into a vector may be desirable or necessary depending on the expression vector. The techniques for modifying polynucleotides utilizing recombinant DNA methods are well known in the art.
The control sequence may be a promoter, a polynucleotide that is recognized by a host cell for expression of a polynucleotide encoding a polypeptide of the present invention. The promoter contains transcriptional control sequences that mediate the expression of the polypeptide. The promoter may be any polynucleotide that shows transcriptional activity in the host cell including mutant, truncated, and hybrid promoters, and may be obtained from genes encoding extracellular or intracellular polypeptides either homologous or heterologous to the host cell.
Examples of suitable promoters for directing transcription of the nucleic acid constructs of the present invention in a bacterial host cell are the promoters obtained from the Bacillus amyloliquefaciens alpha-amylase gene (amyQ), Bacillus licheniformis alpha-amylase gene (amyL), Bacillus licheniformis penicillinase gene (penP), Bacillus stearothermophilus maltogenic amylase gene (amyM), Bacillus subtilis levansucrase gene (sacB), Bacillus subtilis xylA and xylB genes, Bacillus thuringiensis cryIIIA gene (Agaisse and Lereclus, 1994, Molecular Microbiology 13: 97-107), E. coli lac operon, E. coli trc promoter (Egon et al., 1988, Gene 69: 301-315), Streptomyces coelicolor agarase gene (dagA), and prokaryotic beta-lactamase gene (Villa-Kamaroff et al., 1978, Proc. Natl. Acad. Sci. USA 75: 3727-3731), as well as the tac promoter (DeBoer et al., 1983, Proc. Natl. Acad. Sci. USA 80: 21-25). Further promoters are described in “Useful proteins from recombinant bacteria” in Gilbert et al., 1980, Scientific American 242: 74-94; and in Sambrook et al., 1989, supra. Examples of tandem promoters are disclosed in WO 99/43835.
Examples of suitable promoters for directing transcription of the nucleic acid constructs of the present invention in a filamentous fungal host cell are promoters obtained from the genes for Aspergillus nidulans acetamidase, Aspergillus niger neutral alpha-amylase, Aspergillus niger acid stable alpha-amylase, Aspergillus niger or Aspergillus awamori glucoamylase (glaA), Aspergillus oryzae TAKA amylase, Aspergillus oryzae alkaline protease, Aspergillus oryzae triose phosphate isomerase, Fusarium oxysporum trypsin-like protease (WO 96/00787), Fusarium venenatum amyloglucosidase (WO 00/56900), Fusarium venenatum Daria (WO 00/56900), Fusarium venenatum Quinn (WO 00/56900), Rhizomucor miehei lipase, Rhizomucor miehei aspartic proteinase, Trichoderma reesei beta-glucosidase, Trichoderma reesei cellobiohydrolase I, Trichoderma reesei cellobiohydrolase II, Trichoderma reesei endoglucanase I, Trichoderma reesei endoglucanase II, Trichoderma reesei endoglucanase III, Trichoderma reesei endoglucanase IV, Trichoderma reesei endoglucanase V, Trichoderma reesei xylanase I, Trichoderma reesei xylanase II, Trichoderma reesei beta-xylosidase, as well as the NA2-tpi promoter (a modified promoter from an Aspergillus neutral alpha-amylase gene in which the untranslated leader has been replaced by an untranslated leader from an Aspergillus triose phosphate isomerase gene; non-limiting examples include modified promoters from an Aspergillus niger neutral alpha-amylase gene in which the untranslated leader has been replaced by an untranslated leader from an Aspergillus nidulans or Aspergillus oryzae triose phosphate isomerase gene); and mutant, truncated, and hybrid promoters thereof.
In a yeast host, useful promoters are obtained from the genes for Saccharomyces cerevisiae enolase (ENO-1), Saccharomyces cerevisiae galactokinase (GAL1), Saccharomyces cerevisiae alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase (ADH1, ADH2/GAP), Saccharomyces cerevisiae triose phosphate isomerase (TPI), Saccharomyces cerevisiae metallothionein (CUP1), and Saccharomyces cerevisiae 3-phosphoglycerate kinase. Other useful promoters for yeast host cells are described by Romanos et al., 1992, Yeast 8: 423-488.
The control sequence may also be a transcription terminator, which is recognized by a host cell to terminate transcription. The terminator is operably linked to the 3′-terminus of the polynucleotide encoding the polypeptide. Any terminator that is functional in the host cell may be used in the present invention.
Preferred terminators for bacterial host cells are obtained from the genes for Bacillus clausii alkaline protease (aprH), Bacillus licheniformis alpha-amylase (amyL), and Escherichia coli ribosomal RNA (rrnB).
Preferred terminators for filamentous fungal host cells are obtained from the genes for Aspergillus nidulans anthranilate synthase, Aspergillus niger glucoamylase, Aspergillus niger alpha-glucosidase, Aspergillus oryzae TAKA amylase, and Fusarium oxysporum trypsin-like protease.
Preferred terminators for yeast host cells are obtained from the genes for Saccharomyces cerevisiae enolase, Saccharomyces cerevisiae cytochrome C (CYC1), and Saccharomyces cerevisiae glyceraldehyde-3-phosphate dehydrogenase. Other useful terminators for yeast host cells are described by Romanos et al., 1992, supra.
The control sequence may also be an mRNA stabilizer region downstream of a promoter and upstream of the coding sequence of a gene which increases expression of the gene.
Examples of suitable mRNA stabilizer regions are obtained from a Bacillus thuringiensis cryIIIA gene (WO 94/25612) and a Bacillus subtilis SP82 gene (Hue et al., 1995, Journal of Bacteriology 177: 3465-3471).
The control sequence may also be a leader, a nontranslated region of an mRNA that is important for translation by the host cell. The leader is operably linked to the 5′-terminus of the polynucleotide encoding the polypeptide. Any leader that is functional in the host cell may be used.
Preferred leaders for filamentous fungal host cells are obtained from the genes for Aspergillus oryzae TAKA amylase and Aspergillus nidulans triose phosphate isomerase.
Suitable leaders for yeast host cells are obtained from the genes for Saccharomyces cerevisiae enolase (ENO-1), Saccharomyces cerevisiae 3-phosphoglycerate kinase, Saccharomyces cerevisiae alpha-factor, and Saccharomyces cerevisiae alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase (ADH2/GAP).
The control sequence may also be a polyadenylation sequence, a sequence operably linked to the 3′-terminus of the polynucleotide and, when transcribed, is recognized by the host cell as a signal to add polyadenosine residues to transcribed mRNA. Any polyadenylation sequence that is functional in the host cell may be used.
Preferred polyadenylation sequences for filamentous fungal host cells are obtained from the genes for Aspergillus nidulans anthranilate synthase, Aspergillus niger glucoamylase, Aspergillus niger alpha-glucosidase Aspergillus oryzae TAKA amylase, and Fusarium oxysporum trypsin-like protease.
Useful polyadenylation sequences for yeast host cells are described by Guo and Sherman, 1995, Mol. Cellular Biol. 15: 5983-5990.
The control sequence may also be a signal peptide coding region that encodes a signal peptide linked to the N-terminus of a polypeptide and directs the polypeptide into the cell's secretory pathway. The 5′-end of the coding sequence of the polynucleotide may inherently contain a signal peptide coding sequence naturally linked in translation reading frame with the segment of the coding sequence that encodes the polypeptide. Alternatively, the 5′-end of the coding sequence may contain a signal peptide coding sequence that is foreign to the coding sequence. A foreign signal peptide coding sequence may be required where the coding sequence does not naturally contain a signal peptide coding sequence. Alternatively, a foreign signal peptide coding sequence may simply replace the natural signal peptide coding sequence in order to enhance secretion of the polypeptide. However, any signal peptide coding sequence that directs the expressed polypeptide into the secretory pathway of a host cell may be used.
Effective signal peptide coding sequences for bacterial host cells are the signal peptide coding sequences obtained from the genes for Bacillus NCIB 11837 maltogenic amylase, Bacillus licheniformis subtilisin, Bacillus licheniformis beta-lactamase, Bacillus stearothermophilus alpha-amylase, Bacillus stearothermophilus neutral proteases (nprT, nprS, nprM), and Bacillus subtilis prsA. Further signal peptides are described by Simonen and Palva, 1993, Microbiological Reviews 57: 109-137.
Effective signal peptide coding sequences for filamentous fungal host cells are the signal peptide coding sequences obtained from the genes for Aspergillus niger neutral amylase, Aspergillus niger glucoamylase, Aspergillus oryzae TAKA amylase, Humicola insolens cellulase, Humicola insolens endoglucanase V, Humicola lanuginosa lipase, and Rhizomucor miehei aspartic proteinase.
Useful signal peptides for yeast host cells are obtained from the genes for Saccharomyces cerevisiae alpha-factor and Saccharomyces cerevisiae invertase. Other useful signal peptide coding sequences are described by Romanos et al., 1992, supra.
The control sequence may also be a propeptide coding sequence that encodes a propeptide positioned at the N-terminus of a polypeptide. The resultant polypeptide is known as a proenzyme or propolypeptide (or a zymogen in some cases). A propolypeptide is generally inactive and can be converted to an active polypeptide by catalytic or autocatalytic cleavage of the propeptide from the propolypeptide. The propeptide coding sequence may be obtained from the genes for Bacillus subtilis alkaline protease (aprE), Bacillus subtilis neutral protease (nprT), Myceliophthora thermophila laccase (WO 95/33836), Rhizomucor miehei aspartic proteinase, and Saccharomyces cerevisiae alpha-factor.
Where both signal peptide and propeptide sequences are present, the propeptide sequence is positioned next to the N-terminus of a polypeptide and the signal peptide sequence is positioned next to the N-terminus of the propeptide sequence.
It may also be desirable to add regulatory sequences that regulate expression of the polypeptide relative to the growth of the host cell. Examples of regulatory systems are those that cause expression of the gene to be turned on or off in response to a chemical or physical stimulus, including the presence of a regulatory compound. Regulatory systems in prokaryotic systems include the lac, tac, and trp operator systems. In yeast, the ADH2 system or GAL1 system may be used. In filamentous fungi, the Aspergillus niger glucoamylase promoter, Aspergillus oryzae TAKA alpha-amylase promoter, and Aspergillus oryzae glucoamylase promoter may be used. Other examples of regulatory sequences are those that allow for gene amplification. In eukaryotic systems, these regulatory sequences include the dihydrofolate reductase gene that is amplified in the presence of methotrexate, and the metallothionein genes that are amplified with heavy metals. In these cases, the polynucleotide encoding the polypeptide would be operably linked with the regulatory sequence.
Expression Vectors
The present invention also relates to recombinant expression vectors comprising a polynucleotide of the present invention, a promoter, and transcriptional and translational stop signals. The various nucleotide and control sequences may be joined together to produce a recombinant expression vector that may include one or more convenient restriction sites to allow for insertion or substitution of the polynucleotide encoding the polypeptide at such sites. Alternatively, the polynucleotide may be expressed by inserting the polynucleotide or a nucleic acid construct comprising the polynucleotide into an appropriate vector for expression. In creating the expression vector, the coding sequence is located in the vector so that the coding sequence is operably linked with the appropriate control sequences for expression.
The recombinant expression vector may be any vector (e.g., a plasmid or virus) that can be conveniently subjected to recombinant DNA procedures and can bring about expression of the polynucleotide. The choice of the vector will typically depend on the compatibility of the vector with the host cell into which the vector is to be introduced. The vector may be a linear or closed circular plasmid.
The vector may be an autonomously replicating vector, i.e., a vector that exists as an extrachromosomal entity, the replication of which is independent of chromosomal replication, e.g., a plasmid, an extrachromosomal element, a minichromosome, or an artificial chromosome. The vector may contain any means for assuring self-replication. Alternatively, the vector may be one that, when introduced into the host cell, is integrated into the genome and replicated together with the chromosome(s) into which it has been integrated. Furthermore, a single vector or plasmid or two or more vectors or plasmids that together contain the total DNA to be introduced into the genome of the host cell, or a transposon, may be used.
The vector preferably contains one or more selectable markers that permit easy selection of transformed, transfected, transduced, or the like cells. A selectable marker is a gene the product of which provides for biocide or viral resistance, resistance to heavy metals, prototrophy to auxotrophs, and the like.
Examples of bacterial selectable markers are Bacillus licheniformis or Bacillus subtilis dal genes, or markers that confer antibiotic resistance such as ampicillin, chloramphenicol, kanamycin, neomycin, spectinomycin, or tetracycline resistance. Suitable markers for yeast host cells include, but are not limited to, ADE2, HIS3, LEU2, LYS2, MET3, TRP1, and URA3. Selectable markers for use in a filamentous fungal host cell include, but are not limited to, amdS (acetamidase), argB (ornithine carbamoyltransferase), bar (phosphinothricin acetyltransferase), hph (hygromycin phosphotransferase), niaD (nitrate reductase), pyrG (orotidine-5′-phosphate decarboxylase), sC (sulfate adenyltransferase), and trpC (anthranilate synthase), as well as equivalents thereof. Preferred for use in an Aspergillus cell are Aspergillus nidulans or Aspergillus oryzae amdS and pyrG genes and a Streptomyces hygroscopicus bar gene.
The vector preferably contains an element(s) that permits integration of the vector into the host cell's genome or autonomous replication of the vector in the cell independent of the genome.
For integration into the host cell genome, the vector may rely on the polynucleotide's sequence encoding the polypeptide or any other element of the vector for integration into the genome by homologous or non-homologous recombination. Alternatively, the vector may contain additional polynucleotides for directing integration by homologous recombination into the genome of the host cell at a precise location(s) in the chromosome(s). To increase the likelihood of integration at a precise location, the integrational elements should contain a sufficient number of nucleic acids, such as 100 to 10,000 base pairs, 400 to 10,000 base pairs, and 800 to 10,000 base pairs, which have a high degree of sequence identity to the corresponding target sequence to enhance the probability of homologous recombination. The integrational elements may be any sequence that is homologous with the target sequence in the genome of the host cell. Furthermore, the integrational elements may be non-encoding or encoding polynucleotides. On the other hand, the vector may be integrated into the genome of the host cell by non-homologous recombination.
For autonomous replication, the vector may further comprise an origin of replication enabling the vector to replicate autonomously in the host cell in question. The origin of replication may be any plasmid replicator mediating autonomous replication that functions in a cell. The term “origin of replication” or “plasmid replicator” means a polynucleotide that enables a plasmid or vector to replicate in vivo.
Examples of bacterial origins of replication are the origins of replication of plasmids pBR322, pUC19, pACYC177, and pACYC184 permitting replication in E. coli , and pUB110, pE194, pTA1060, and pAMR1 permitting replication in Bacillus.
Examples of origins of replication for use in a yeast host cell are the 2 micron origin of replication, ARS1, ARS4, the combination of ARS1 and CEN3, and the combination of ARS4 and CEN6.
Examples of origins of replication useful in a filamentous fungal cell are AMA1 and ANS1 (Gems et al., 1991, Gene 98: 61-67; Cullen et al., 1987, Nucleic Acids Res. 15: 9163-9175; WO 00/24883). Isolation of the AMA1 gene and construction of plasmids or vectors comprising the gene can be accomplished according to the methods disclosed in WO 00/24883.
More than one copy of a polynucleotide of the present invention may be inserted into a host cell to increase production of a polypeptide. An increase in the copy number of the polynucleotide can be obtained by integrating at least one additional copy of the sequence into the host cell genome or by including an amplifiable selectable marker gene with the polynucleotide where cells containing amplified copies of the selectable marker gene, and thereby additional copies of the polynucleotide, can be selected for by cultivating the cells in the presence of the appropriate selectable agent.
The procedures used to ligate the elements described above to construct the recombinant expression vectors of the present invention are well known to one skilled in the art (see, e.g., Sambrook et al., 1989, supra).
Host Cells
The present invention also relates to recombinant host cells, comprising a polynucleotide of the present invention operably linked to one or more control sequences that direct the production of a polypeptide of the present invention. A construct or vector comprising a polynucleotide is introduced into a host cell so that the construct or vector is maintained as a chromosomal integrant or as a self-replicating extra-chromosomal vector as described earlier. The term “host cell” encompasses any progeny of a parent cell that is not identical to the parent cell due to mutations that occur during replication. The choice of a host cell will to a large extent depend upon the gene encoding the polypeptide and its source.
The host cell may be any cell useful in the recombinant production of a polypeptide of the present invention, e.g., a prokaryote or a eukaryote.
The prokaryotic host cell may be any Gram-positive or Gram-negative bacterium. Gram-positive bacteria include, but are not limited to, Bacillus, Clostridium, Enterococcus, Geobacillus, Lactobacillus, Lactococcus, Oceanobacillus, Staphylococcus, Streptococcus , and Streptomyces . Gram-negative bacteria include, but are not limited to, Campylobacter, E. coli, Flavobacterium, Fusobacterium, Helicobacter, Ilyobacter, Neisseria, Pseudomonas, Salmonella , and Ureaplasma.
The bacterial host cell may be any Bacillus cell including, but not limited to, Bacillus alkalophilus, Bacillus amyloliquefaciens, Bacillus brevis, Bacillus circulans, Bacillus clausii, Bacillus coagulans, Bacillus firmus, Bacillus lautus, Bacillus lentus, Bacillus licheniformis, Bacillus megaterium, Bacillus pumilus, Bacillus stearothermophilus, Bacillus subtilis , and Bacillus thuringiensis cells.
The bacterial host cell may also be any Streptococcus cell including, but not limited to, Streptococcus equisimilis, Streptococcus pyogenes, Streptococcus uberis , and Streptococcus equi subsp. Zooepidemicus cells.
The bacterial host cell may also be any Streptomyces cell including, but not limited to, Streptomyces achromogenes, Streptomyces avermitilis, Streptomyces coelicolor, Streptomyces griseus , and Streptomyces lividans cells.
The introduction of DNA into a Bacillus cell may be effected by protoplast transformation (see, e.g., Chang and Cohen, 1979, Mol. Gen. Genet. 168: 111-115), competent cell transformation (see, e.g., Young and Spizizen, 1961, J. Bacteriol. 81: 823-829, or Dubnau and Davidoff-Abelson, 1971, J. Mol. Biol. 56: 209-221), electroporation (see, e.g., Shigekawa and Dower, 1988, Biotechniques 6: 742-751), or conjugation (see, e.g., Koehler and Thorne, 1987, J. Bacteriol. 169: 5271-5278). The introduction of DNA into an E. coli cell may be effected by protoplast transformation (see, e.g., Hanahan, 1983, J. Mol. Biol. 166: 557-580) or electroporation (see, e.g., Dower et al., 1988, Nucleic Acids Res. 16: 6127-6145). The introduction of DNA into a Streptomyces cell may be effected by protoplast transformation, electroporation (see, e.g., Gong et al., 2004, Folia Microbiol. (Praha) 49: 399-405), conjugation (see, e.g., Mazodier et al., 1989, J. Bacteriol. 171: 3583-3585), or transduction (see, e.g., Burke et al., 2001, Proc. Natl. Acad. Sci. USA 98: 6289-6294). The introduction of DNA into a Pseudomonas cell may be effected by electroporation (see, e.g., Choi et al., 2006, J. Microbiol. Methods 64: 391-397) or conjugation (see, e.g., Pinedo and Smets, 2005, Appl. Environ. Microbiol. 71: 51-57). The introduction of DNA into a Streptococcus cell may be effected by natural competence (see, e.g., Perry and Kuramitsu, 1981, Infect. Immun. 32: 1295-1297), protoplast transformation (see, e.g., Catt and Jollick, 1991, Microbios 68: 189-207), electroporation (see, e.g., Buckley et al., 1999, Appl. Environ. Microbiol. 65: 3800-3804), or conjugation (see, e.g., Clewell, 1981, Microbiol. Rev. 45: 409-436). However, any method known in the art for introducing DNA into a host cell can be used.
The host cell may also be a eukaryote, such as a mammalian, insect, plant, or fungal cell.
The host cell may be a fungal cell. “Fungi” as used herein includes the phyla Ascomycota, Basidiomycota, Chytridiomycota, and Zygomycota as well as the Oomycota and all mitosporic fungi (as defined by Hawksworth et al., In, Ainsworth and Bisby's Dictionary of The Fungi, 8th edition, 1995, CAB International, University Press, Cambridge, UK).
The fungal host cell may be a yeast cell. “Yeast” as used herein includes ascosporogenous yeast (Endomycetales), basidiosporogenous yeast, and yeast belonging to the Fungi Imperfecti (Blastomycetes). Since the classification of yeast may change in the future, for the purposes of this invention, yeast shall be defined as described in Biology and Activities of Yeast (Skinner, Passmore, and Davenport, editors, Soc. App. Bacteriol. Symposium Series No. 9, 1980).
The yeast host cell may be a Candida, Hansenula, Kluyveromyces, Pichia, Saccharomyces, Schizosaccharomyces , or Yarrowia cell, such as a Kluyveromyces lactis, Saccharomyces carlsbergensis, Saccharomyces cerevisiae, Saccharomyces diastaticus, Saccharomyces douglasii, Saccharomyces kluyveri, Saccharomyces norbensis, Saccharomyces oviformis , or Yarrowia lipolytica cell.
The fungal host cell may be a filamentous fungal cell. “Filamentous fungi” include all filamentous forms of the subdivision Eumycota and Oomycota (as defined by Hawksworth et al., 1995, supra). The filamentous fungi are generally characterized by a mycelial wall composed of chitin, cellulose, glucan, chitosan, mannan, and other complex polysaccharides. Vegetative growth is by hyphal elongation and carbon catabolism is obligately aerobic. In contrast, vegetative growth by yeasts such as Saccharomyces cerevisiae is by budding of a unicellular thallus and carbon catabolism may be fermentative.
The filamentous fungal host cell may be an Acremonium, Aspergillus, Aureobasidium, Bjerkandera, Ceriporiopsis, Chrysosporium, Coprinus, Coriolus, Cryptococcus, Filibasidium, Fusarium, Humicola, Magnaporthe, Mucor, Myceliophthora, Neocallimastix, Neurospora, Paecilomyces, Penicillium, Phanerochaete, Phlebia, Piromyces, Pleurotus, Schizophyllum, Talaromyces, Thermoascus, Thielavia, Tolypocladium, Trametes , or Trichoderma cell.
For example, the filamentous fungal host cell may be an Aspergillus awamori, Aspergillus foetidus, Aspergillus fumigatus, Aspergillus japonicus, Aspergillus nidulans, Aspergillus niger, Aspergillus oryzae, Bjerkandera adusta, Ceriporiopsis aneirina, Ceriporiopsis caregiea, Ceriporiopsis gilvescens, Ceriporiopsis pannocinta, Ceriporiopsis rivulosa, Ceriporiopsis subrufa, Ceriporiopsis subvermispora, Chrysosporium inops, Chrysosporium keratinophilum, Chrysosporium lucknowense, Chrysosporium merdarium, Chrysosporium pannicola, Chrysosporium queenslandicum, Chrysosporium tropicum, Chrysosporium zonatum, Coprinus cinereus, Coriolus hirsutus, Fusarium bactridioides, Fusarium cerealis, Fusarium crookwellense, Fusarium culmorum, Fusarium graminearum, Fusarium graminum, Fusarium heterosporum, Fusarium negundi, Fusarium oxysporum, Fusarium reticulatum, Fusarium roseum, Fusarium sambucinum, Fusarium sarcochroum, Fusarium sporotrichioides, Fusarium sulphureum, Fusarium torulosum, Fusarium trichothecioides, Fusarium venenatum, Humicola insolens, Humicola lanuginosa, Mucor miehei, Myceliophthora thermophila, Neurospora crassa, Penicillium purpurogenum, Phanerochaete chrysosporium, Phlebia radiata, Pleurotus eryngii, Thielavia terrestris, Trametes villosa, Trametes versicolor, Trichoderma harzianum, Trichoderma koningii, Trichoderma longibrachiatum, Trichoderma reesei , or Trichoderma viride cell.
Fungal cells may be transformed by a process involving protoplast formation, transformation of the protoplasts, and regeneration of the cell wall in a manner known per se. Suitable procedures for transformation of Aspergillus and Trichoderma host cells are described in EP 238023, Yelton et al., 1984 , Proc. Natl. Acad. Sci. USA 81: 1470-1474, and Christensen et al., 1988 , Bio/Technology 6: 1419-1422. Suitable methods for transforming Fusarium species are described by Malardier et al., 1989 , Gene 78: 147-156, and WO 96/00787. Yeast may be transformed using the procedures described by Becker and Guarente, In Abelson, J. N. and Simon, M. I., editors, Guide to Yeast Genetics and Molecular Biology, Methods in Enzymology , Volume 194, pp 182-187, Academic Press, Inc., New York; Ito et al., 1983 , J. Bacteriol. 153: 163; and Hinnen et al., 1978 , Proc. Natl. Acad. Sci. USA 75: 1920.
Methods of Production
The present invention also relates to methods of producing a polypeptide of the present invention, comprising (a) cultivating a cell, which in its wild-type form produces the polypeptide, under conditions conducive for production of the polypeptide; and (b) recovering the polypeptide. In a preferred aspect, the cell is a Lentinus cell. In a more preferred aspect, the cell is a Lentinus similis cell. In a most preferred aspect, the cell is Lentinus similis Strain NN048945.
The present invention also relates to methods of producing a polypeptide of the present invention, comprising (a) cultivating a recombinant host cell of the present invention under conditions conducive for production of the polypeptide; and (b) recovering the polypeptide.
The host cells are cultivated in a nutrient medium suitable for production of the polypeptide using methods known in the art. For example, the cell may be cultivated by shake flask cultivation, or small-scale or large-scale fermentation (including continuous, batch, fed-batch, or solid state fermentations) in laboratory or industrial fermentors in a suitable medium and under conditions allowing the polypeptide to be expressed and/or isolated. The cultivation takes place in a suitable nutrient medium comprising carbon and nitrogen sources and inorganic salts, using procedures known in the art. Suitable media are available from commercial suppliers or may be prepared according to published compositions (e.g., in catalogues of the American Type Culture Collection). If the polypeptide is secreted into the nutrient medium, the polypeptide can be recovered directly from the medium. If the polypeptide is not secreted, it can be recovered from cell lysates.
The polypeptide may be detected using methods known in the art that are specific for the polypeptides. These detection methods include, but are not limited to, use of specific antibodies, formation of an enzyme product, or disappearance of an enzyme substrate. For example, an enzyme assay may be used to determine the activity of the polypeptide.
The polypeptide may be recovered using methods known in the art. For example, the polypeptide may be recovered from the nutrient medium by conventional procedures including, but not limited to, collection, centrifugation, filtration, extraction, spray-drying, evaporation, or precipitation.
The polypeptide may be purified by a variety of procedures known in the art including, but not limited to, chromatography (e.g., ion exchange, affinity, hydrophobic, chromatofocusing, and size exclusion), electrophoretic procedures (e.g., preparative isoelectric focusing), differential solubility (e.g., ammonium sulfate precipitation), SDS-PAGE, or extraction (see, e.g., Protein Purification , Janson and Ryden, editors, VCH Publishers, New York, 1989) to obtain substantially pure polypeptides.
In an alternative aspect, the polypeptide is not recovered, but rather a host cell of the present invention expressing the polypeptide is used as a source of the polypeptide.
Plants
The present invention also relates to isolated plants, e.g., a transgenic plant, plant part, or plant cell, comprising a polynucleotide of the present invention so as to express and produce a polypeptide or domain in recoverable quantities. The polypeptide or domain may be recovered from the plant or plant part. Alternatively, the plant or plant part containing the polypeptide or domain may be used as such for improving the quality of a food or feed, e.g., improving nutritional value, palatability, and rheological properties, or to destroy an antinutritive factor.
The transgenic plant can be dicotyledonous (a dicot) or monocotyledonous (a monocot). Examples of monocot plants are grasses, such as meadow grass (blue grass, Poa ), forage grass such as Festuca, Lolium , temperate grass, such as Agrostis , and cereals, e.g., wheat, oats, rye, barley, rice, sorghum, and maize (corn).
Examples of dicot plants are tobacco, legumes, such as lupins, potato, sugar beet, pea, bean and soybean, and cruciferous plants (family Brassicaceae), such as cauliflower, rape seed, and the closely related model organism Arabidopsis thaliana.
Examples of plant parts are stem, callus, leaves, root, fruits, seeds, and tubers as well as the individual tissues comprising these parts, e.g., epidermis, mesophyll, parenchyme, vascular tissues, meristems. Specific plant cell compartments, such as chloroplasts, apoplasts, mitochondria, vacuoles, peroxisomes and cytoplasm are also considered to be a plant part. Furthermore, any plant cell, whatever the tissue origin, is considered to be a plant part. Likewise, plant parts such as specific tissues and cells isolated to facilitate the utilization of the invention are also considered plant parts, e.g., embryos, endosperms, aleurone and seed coats.
Also included within the scope of the present invention are the progeny of such plants, plant parts, and plant cells.
The transgenic plant or plant cell expressing the polypeptide or domain may be constructed in accordance with methods known in the art. In short, the plant or plant cell is constructed by incorporating one or more expression constructs encoding the polypeptide or domain into the plant host genome or chloroplast genome and propagating the resulting modified plant or plant cell into a transgenic plant or plant cell.
The expression construct is conveniently a nucleic acid construct that comprises a polynucleotide encoding a polypeptide or domain operably linked with appropriate regulatory sequences required for expression of the polynucleotide in the plant or plant part of choice. Furthermore, the expression construct may comprise a selectable marker useful for identifying plant cells into which the expression construct has been integrated and DNA sequences necessary for introduction of the construct into the plant in question (the latter depends on the DNA introduction method to be used).
The choice of regulatory sequences, such as promoter and terminator sequences and optionally signal or transit sequences, is determined, for example, on the basis of when, where, and how the polypeptide or domain is desired to be expressed. For instance, the expression of the gene encoding a polypeptide or domain may be constitutive or inducible, or may be developmental, stage or tissue specific, and the gene product may be targeted to a specific tissue or plant part such as seeds or leaves. Regulatory sequences are, for example, described by Tague et al., 1988 , Plant Physiology 86: 506. For constitutive expression, the 35S-CaMV, the maize ubiquitin 1, or the rice actin 1 promoter may be used (Franck et al., 1980 , Cell 21: 285-294; Christensen et al., 1992 , Plant Mol. Biol. 18: 675-689; Zhang et al., 1991 , Plant Cell 3: 1155-1165). Organ-specific promoters may be, for example, a promoter from storage sink tissues such as seeds, potato tubers, and fruits (Edwards and Coruzzi, 1990 , Ann. Rev. Genet. 24: 275-303), or from metabolic sink tissues such as meristems (Ito et al., 1994 , Plant Mol. Biol. 24: 863-878), a seed specific promoter such as the glutelin, prolamin, globulin, or albumin promoter from rice (Wu et al., 1998 , Plant Cell Physiol. 39: 885-889), a Vicia faba promoter from the legumin B4 and the unknown seed protein gene from Vicia faba (Conrad et al., 1998 , J. Plant Physiol. 152: 708-711), a promoter from a seed oil body protein (Chen et al., 1998 , Plant Cell Physiol. 39: 935-941), the storage protein napA promoter from Brassica napus , or any other seed specific promoter known in the art, e.g., as described in WO 91/14772. Furthermore, the promoter may be a leaf specific promoter such as the rbcs promoter from rice or tomato (Kyozuka et al., 1993 , Plant Physiol. 102: 991-1000), the chlorella virus adenine methyltransferase gene promoter (Mitra and Higgins, 1994 , Plant Mol. Biol. 26: 85-93), the aldP gene promoter from rice (Kagaya et al., 1995 , Mol. Gen. Genet. 248: 668-674), or a wound inducible promoter such as the potato pin2 promoter (Xu et al., 1993 , Plant Mol. Biol. 22: 573-588). Likewise, the promoter may be induced by abiotic treatments such as temperature, drought, or alterations in salinity or induced by exogenously applied substances that activate the promoter, e.g., ethanol, oestrogens, plant hormones such as ethylene, abscisic acid, and gibberellic acid, and heavy metals.
A promoter enhancer element may also be used to achieve higher expression of a polypeptide or domain in the plant. For instance, the promoter enhancer element may be an intron that is placed between the promoter and the polynucleotide encoding a polypeptide or domain. For instance, Xu et al., 1993, supra, disclose the use of the first intron of the rice actin 1 gene to enhance expression.
The selectable marker gene and any other parts of the expression construct may be chosen from those available in the art.
The nucleic acid construct is incorporated into the plant genome according to conventional techniques known in the art, including Agrobacterium -mediated transformation, virus-mediated transformation, microinjection, particle bombardment, biolistic transformation, and electroporation (Gasser et al., 1990 , Science 244: 1293; Potrykus, 1990 , Bio/Technology 8: 535; Shimamoto et al., 1989 , Nature 338: 274).
Agrobacterium tumefaciens -mediated gene transfer is a method for generating transgenic dicots (for a review, see Hooykas and Schilperoort, 1992 , Plant Mol. Biol. 19: 15-38) and for transforming monocots, although other transformation methods may be used for these plants. A method for generating transgenic monocots is particle bombardment (microscopic gold or tungsten particles coated with the transforming DNA) of embryonic calli or developing embryos (Christou, 1992 , Plant J. 2: 275-281; Shimamoto, 1994 , Curr. Opin. Biotechnol. 5: 158-162; Vasil et al., 1992 , Bio/Technology 10: 667-674). An alternative method for transformation of monocots is based on protoplast transformation as described by Omirulleh et al., 1993 , Plant Mol. Biol. 21: 415-428. Additional transformation methods include those described in U.S. Pat. Nos. 6,395,966 and 7,151,204 (both of which are herein incorporated by reference in their entirety).
Following transformation, the transformants having incorporated the expression construct are selected and regenerated into whole plants according to methods well known in the art. Often the transformation procedure is designed for the selective elimination of selection genes either during regeneration or in the following generations by using, for example, co-transformation with two separate T-DNA constructs or site specific excision of the selection gene by a specific recombinase.
In addition to direct transformation of a particular plant genotype with a construct of the present invention, transgenic plants may be made by crossing a plant having the construct to a second plant lacking the construct. For example, a construct encoding a polypeptide or domain can be introduced into a particular plant variety by crossing, without the need for ever directly transforming a plant of that given variety. Therefore, the present invention encompasses not only a plant directly regenerated from cells which have been transformed in accordance with the present invention, but also the progeny of such plants. As used herein, progeny may refer to the offspring of any generation of a parent plant prepared in accordance with the present invention. Such progeny may include a DNA construct prepared in accordance with the present invention. Crossing results in the introduction of a transgene into a plant line by cross pollinating a starting line with a donor plant line. Non-limiting examples of such steps are described in U.S. Pat. No. 7,151,204.
Plants may be generated through a process of backcross conversion. For example, plants include plants referred to as a backcross converted genotype, line, inbred, or hybrid.
Genetic markers may be used to assist in the introgression of one or more transgenes of the invention from one genetic background into another. Marker assisted selection offers advantages relative to conventional breeding in that it can be used to avoid errors caused by phenotypic variations. Further, genetic markers may provide data regarding the relative degree of elite germplasm in the individual progeny of a particular cross. For example, when a plant with a desired trait which otherwise has a non-agronomically desirable genetic background is crossed to an elite parent, genetic markers may be used to select progeny which not only possess the trait of interest, but also have a relatively large proportion of the desired germplasm. In this way, the number of generations required to introgress one or more traits into a particular genetic background is minimized.
The present invention also relates to methods of producing a polypeptide or domain of the present invention comprising (a) cultivating a transgenic plant or a plant cell comprising a polynucleotide encoding the polypeptide or domain under conditions conducive for production of the polypeptide or domain; and (b) recovering the polypeptide or domain.
Compositions
The present invention also relates to compositions comprising a polypeptide of the present invention. Preferably, the compositions are enriched in such a polypeptide. The term “enriched” indicates that the xylanase activity of the composition has been increased, e.g., with an enrichment factor of at least 1.1.
The composition may comprise a polypeptide of the present invention as the major enzymatic component, e.g., a mono-component composition. Alternatively, the composition may comprise multiple enzymatic activities, such as one or more (e.g., several) enzymes selected from the group consisting of a cellulase, a hemicellulase, GH61 polypeptide, an expansin, an esterase, a laccase, a ligninolytic enzyme, a pectinase, a peroxidase, a protease, and a swollenin.
The polypeptide compositions may be prepared in accordance with methods known in the art and may be in the form of a liquid or a dry composition. For instance, the polypeptide composition may be in the form of a granulate or a microgranulate. The polypeptide to be included in the composition may be stabilized in accordance with methods known in the art.
Examples are given below of preferred uses of the polypeptide compositions of the invention. The dosage of the polypeptide composition of the invention and other conditions under which the composition is used may be determined on the basis of methods known in the art.
Uses
The present invention is also directed to the following processes for using the polypeptides having xylanase activity, or compositions thereof.
The present invention also relates to processes for degrading a cellulosic material or xylan-containing material, comprising: treating the cellulosic material or xylan-containing material with an enzyme composition in the presence of a polypeptide having xylanase activity of the present invention. In one aspect, the processes further comprise recovering the degraded or converted cellulosic material or xylan-containing material. Soluble products of degradation or conversion of the cellulosic material or xylan-containing material can be separated from insoluble cellulosic material or xylan-containing material using a method known in the art such as, for example, centrifugation, filtration, or gravity settling.
The present invention also relates to processes of producing a fermentation product, comprising: (a) saccharifying a cellulosic material or xylan-containing material with an enzyme composition in the presence of a polypeptide having xylanase activity of the present invention; (b) fermenting the saccharified cellulosic material or xylan-containing material with one or more (e.g., several) fermenting microorganisms to produce the fermentation product; and (c) recovering the fermentation product from the fermentation.
The present invention also relates to processes of fermenting a cellulosic material or xylan-containing material, comprising: fermenting the cellulosic material or xylan-containing material with one or more (e.g., several) fermenting microorganisms, wherein the cellulosic material or xylan-containing material is saccharified with an enzyme composition in the presence of a polypeptide having xylanase activity of the present invention. In one aspect, the fermenting of the cellulosic material or xylan-containing material produces a fermentation product. In another aspect, the processes further comprise recovering the fermentation product from the fermentation.
The processes of the present invention can be used to saccharify the cellulosic material or xylan-containing material to fermentable sugars and to convert the fermentable sugars to many useful fermentation products, e.g., fuel, potable ethanol, and/or platform chemicals (e.g., acids, alcohols, ketones, gases, and the like). The production of a desired fermentation product from the cellulosic material or xylan-containing material typically involves pretreatment, enzymatic hydrolysis (saccharification), and fermentation.
The processing of the cellulosic material or xylan-containing material according to the present invention can be accomplished using methods conventional in the art. Moreover, the processes of the present invention can be implemented using any conventional biomass processing apparatus configured to operate in accordance with the invention.
Hydrolysis (saccharification) and fermentation, separate or simultaneous, include, but are not limited to, separate hydrolysis and fermentation (SHF); simultaneous saccharification and fermentation (SSF); simultaneous saccharification and co-fermentation (SSCF); hybrid hydrolysis and fermentation (HHF); separate hydrolysis and co-fermentation (SHCF); hybrid hydrolysis and co-fermentation (HHCF); and direct microbial conversion (DMC), also sometimes called consolidated bioprocessing (CBP). SHF uses separate process steps to first enzymatically hydrolyze the cellulosic material or xylan-containing material to fermentable sugars, e.g., glucose, cellobiose, and pentose monomers, and then ferment the fermentable sugars to ethanol. In SSF, the enzymatic hydrolysis of the cellulosic material or xylan-containing material and the fermentation of sugars to ethanol are combined in one step (Philippidis, G. P., 1996, Cellulose bioconversion technology, in Handbook on Bioethanol: Production and Utilization , Wyman, C. E., ed., Taylor & Francis, Washington, D.C., 179-212). SSCF involves the co-fermentation of multiple sugars (Sheehan, J., and Himmel, M., 1999, Enzymes, energy and the environment: A strategic perspective on the U.S. Department of Energy's research and development activities for bioethanol, Biotechnol. Prog. 15: 817-827). HHF involves a separate hydrolysis step, and in addition a simultaneous saccharification and hydrolysis step, which can be carried out in the same reactor. The steps in an HHF process can be carried out at different temperatures, i.e., high temperature enzymatic saccharification followed by SSF at a lower temperature that the fermentation strain can tolerate. DMC combines all three processes (enzyme production, hydrolysis, and fermentation) in one or more (e.g., several) steps where the same organism is used to produce the enzymes for conversion of the cellulosic material or xylan-containing material to fermentable sugars and to convert the fermentable sugars into a final product (Lynd et al., 2002, Microbial cellulose utilization: Fundamentals and biotechnology, Microbiol. Mol. Biol. Reviews 66: 506-577). It is understood herein that any method known in the art comprising pretreatment, enzymatic hydrolysis (saccharification), fermentation, or a combination thereof, can be used in the practicing the processes of the present invention.
A conventional apparatus can include a fed-batch stirred reactor, a batch stirred reactor, a continuous flow stirred reactor with ultrafiltration, and/or a continuous plug-flow column reactor (Fernanda de Castilhos et al., Optimal control in fed-batch reactor for the cellobiose hydrolysis, Acta Scientiarum. Technology 25: 33-38; Gusakov and Sinitsyn, 1985, Kinetics of the enzymatic hydrolysis of cellulose: 1. A mathematical model for a batch reactor process, Enz. Microb. Technol. 7: 346-352), an attrition reactor (Ryu and Lee, 1983, Bioconversion of waste cellulose by using an attrition bioreactor, Biotechnol. Bioeng. 25: 53-65), or a reactor with intensive stirring induced by an electromagnetic field (Gusakov et al., 1996, Enhancement of enzymatic cellulose hydrolysis using a novel type of bioreactor with intensive stirring induced by electromagnetic field, Appl. Biochem. Biotechnol. 56: 141-153). Additional reactor types include fluidized bed, upflow blanket, immobilized, and extruder type reactors for hydrolysis and/or fermentation.
Pretreatment.
In practicing the processes of the present invention, any pretreatment process known in the art can be used to disrupt plant cell wall components of the cellulosic material or xylan-containing material (Chandra et al., 2007, Substrate pretreatment: The key to effective enzymatic hydrolysis of lignocellulosics?, Adv. Biochem. Engin./Biotechnol. 108: 67-93; Galbe and Zacchi, 2007, Pretreatment of lignocellulosic materials for efficient bioethanol production, Adv. Biochem. Engin./Biotechnol. 108: 41-65; Hendriks and Zeeman, 2009, Pretreatments to enhance the digestibility of lignocellulosic biomass, Bioresource Technol. 100: 10-18; Mosier et al., 2005, Features of promising technologies for pretreatment of lignocellulosic biomass, Bioresource Technol. 96: 673-686; Taherzadeh and Karimi, 2008, Pretreatment of lignocellulosic wastes to improve ethanol and biogas production: A review, Int. J. of Mol. Sci. 9: 1621-1651; Yang and Wyman, 2008, Pretreatment: the key to unlocking low-cost cellulosic ethanol, Biofuels Bioproducts and Biorefining - Biofpr. 2: 26-40).
The cellulosic material or xylan-containing material can also be subjected to particle size reduction, sieving, pre-soaking, wetting, washing, and/or conditioning prior to pretreatment using methods known in the art.
Conventional pretreatments include, but are not limited to, steam pretreatment (with or without explosion), dilute acid pretreatment, hot water pretreatment, alkaline pretreatment, lime pretreatment, wet oxidation, wet explosion, ammonia fiber explosion, organosolv pretreatment, and biological pretreatment. Additional pretreatments include ammonia percolation, ultrasound, electroporation, microwave, supercritical CO 2 , supercritical H 2 O, ozone, ionic liquid, and gamma irradiation pretreatments.
The cellulosic material or xylan-containing material can be pretreated before hydrolysis and/or fermentation. Pretreatment is preferably performed prior to the hydrolysis. Alternatively, the pretreatment can be carried out simultaneously with enzyme hydrolysis to release fermentable sugars, such as glucose, xylose, and/or cellobiose. In most cases the pretreatment step itself results in some conversion of biomass to fermentable sugars (even in absence of enzymes).
Steam Pretreatment. In steam pretreatment, the cellulosic material or xylan-containing material is heated to disrupt the plant cell wall components, including lignin, hemicellulose, and cellulose to make the cellulose and other fractions, e.g., hemicellulose, accessible to enzymes. The cellulosic material or xylan-containing material is passed to or through a reaction vessel where steam is injected to increase the temperature to the required temperature and pressure and is retained therein for the desired reaction time. Steam pretreatment is preferably performed at 140-250° C., e.g., 160-200° C. or 170-190° C., where the optimal temperature range depends on addition of a chemical catalyst. Residence time for the steam pretreatment is preferably 1-60 minutes, e.g., 1-30 minutes, 1-20 minutes, 3-12 minutes, or 4-10 minutes, where the optimal residence time depends on temperature range and addition of a chemical catalyst. Steam pretreatment allows for relatively high solids loadings, so that the cellulosic material or xylan-containing material is generally only moist during the pretreatment. The steam pretreatment is often combined with an explosive discharge of the material after the pretreatment, which is known as steam explosion, that is, rapid flashing to atmospheric pressure and turbulent flow of the material to increase the accessible surface area by fragmentation (Duff and Murray, 1996 , Bioresource Technology 855: 1-33; Galbe and Zacchi, 2002 , Appl. Microbiol. Biotechnol. 59: 618-628; U.S. Patent Application No. 2002/0164730). During steam pretreatment, hemicellulose acetyl groups are cleaved and the resulting acid autocatalyzes partial hydrolysis of the hemicellulose to monosaccharides and oligosaccharides. Lignin is removed to only a limited extent.
Chemical Pretreatment: The term “chemical treatment” refers to any chemical pretreatment that promotes the separation and/or release of cellulose, hemicellulose, and/or lignin. Such a pretreatment can convert crystalline cellulose to amorphous cellulose. Examples of suitable chemical pretreatment processes include, for example, dilute acid pretreatment, lime pretreatment, wet oxidation, ammonia fiber/freeze explosion (AFEX), ammonia percolation (APR), ionic liquid, and organosolv pretreatments.
A catalyst such as H 2 SO 4 or SO 2 (typically 0.3 to 5% w/w) is often added prior to steam pretreatment, which decreases the time and temperature, increases the recovery, and improves enzymatic hydrolysis (Ballesteros et al., 2006 , Appl. Biochem. Biotechnol. 129-132: 496-508; Varga et al., 2004 , Appl. Biochem. Biotechnol. 113-116: 509-523; Sassner et al., 2006 , Enzyme Microb. Technol. 39: 756-762). In dilute acid pretreatment, the cellulosic material or xylan-containing material is mixed with dilute acid, typically H 2 SO 4 , and water to form a slurry, heated by steam to the desired temperature, and after a residence time flashed to atmospheric pressure. The dilute acid pretreatment can be performed with a number of reactor designs, e.g., plug-flow reactors, counter-current reactors, or continuous counter-current shrinking bed reactors (Duff and Murray, 1996, supra; Schell et al., 2004 , Bioresource Technol. 91: 179-188; Lee et al., 1999 , Adv. Biochem. Eng. Biotechnol. 65: 93-115).
Several methods of pretreatment under alkaline conditions can also be used. These alkaline pretreatments include, but are not limited to, sodium hydroxide, lime, wet oxidation, ammonia percolation (APR), and ammonia fiber/freeze explosion (AFEX).
Lime pretreatment is performed with calcium oxide or calcium hydroxide at temperatures of 85-150° C. and residence times from 1 hour to several days (Wyman et al., 2005 , Bioresource Technol. 96: 1959-1966; Mosier et al., 2005 , Bioresource Technol. 96: 673-686). WO 2006/110891, WO 2006/110899, WO 2006/110900, and WO 2006/110901 disclose pretreatment methods using ammonia.
Wet oxidation is a thermal pretreatment performed typically at 180-200° C. for 5-15 minutes with addition of an oxidative agent such as hydrogen peroxide or over-pressure of oxygen (Schmidt and Thomsen, 1998 , Bioresource Technol. 64: 139-151; Palonen et al., 2004 , Appl. Biochem. Biotechnol. 117: 1-17; Varga et al., 2004 , Biotechnol. Bioeng. 88: 567-574; Martin et al., 2006 , J. Chem. Technol. Biotechnol. 81: 1669-1677). The pretreatment is performed preferably at 1-40% dry matter, e.g., 2-30% dry matter or 5-20% dry matter, and often the initial pH is increased by the addition of alkali such as sodium carbonate.
A modification of the wet oxidation pretreatment method, known as wet explosion (combination of wet oxidation and steam explosion) can handle dry matter up to 30%. In wet explosion, the oxidizing agent is introduced during pretreatment after a certain residence time. The pretreatment is then ended by flashing to atmospheric pressure (WO 2006/032282).
Ammonia fiber explosion (AFEX) involves treating the cellulosic material or xylan-containing material with liquid or gaseous ammonia at moderate temperatures such as 90-150° C. and high pressure such as 17-20 bar for 5-10 minutes, where the dry matter content can be as high as 60% (Gollapalli et al., 2002 , Appl. Biochem. Biotechnol. 98: 23-35; Chundawat et al., 2007 , Biotechnol. Bioeng. 96: 219-231; Alizadeh et al., 2005 , Appl. Biochem. Biotechnol. 121: 1133-1141; Teymouri et al., 2005 , Bioresource Technol. 96: 2014-2018). During AFEX pretreatment cellulose and hemicelluloses remain relatively intact. Lignin-carbohydrate complexes are cleaved.
Organosolv pretreatment delignifies the cellulosic material or xylan-containing material by extraction using aqueous ethanol (40-60% ethanol) at 160-200° C. for 30-60 minutes (Pan et al., 2005 , Biotechnol. Bioeng. 90: 473-481; Pan et al., 2006 , Biotechnol. Bioeng. 94: 851-861; Kurabi et al., 2005 , Appl. Biochem. Biotechnol. 121: 219-230). Sulphuric acid is usually added as a catalyst. In organosolv pretreatment, the majority of hemicellulose and lignin is removed.
Other examples of suitable pretreatment methods are described by Schell et al., 2003 , Appl. Biochem. and Biotechnol. 105-108: 69-85, and Mosier et al., 2005 , Bioresource Technology 96: 673-686, and U.S. Published Application 2002/0164730.
In one aspect, the chemical pretreatment is preferably carried out as a dilute acid treatment, and more preferably as a continuous dilute acid treatment. The acid is typically sulfuric acid, but other acids can also be used, such as acetic acid, citric acid, nitric acid, phosphoric acid, tartaric acid, succinic acid, hydrogen chloride, or mixtures thereof. Mild acid treatment is conducted in the pH range of preferably 1-5, e.g., 1-4 or 1-2.5. In one aspect, the acid concentration is in the range from preferably 0.01 to 10 wt. % acid, e.g., 0.05 to 5 wt. % acid or 0.1 to 2 wt. % acid. The acid is contacted with the cellulosic material or xylan-containing material and held at a temperature in the range of preferably 140-200° C., e.g., 165-190° C., for periods ranging from 1 to 60 minutes.
In another aspect, pretreatment takes place in an aqueous slurry. In preferred aspects, the cellulosic material or xylan-containing material is present during pretreatment in amounts preferably between 10-80 wt. %, e.g., 20-70 wt. % or 30-60 wt. %, such as around 40 wt. %. The pretreated cellulosic material or xylan-containing material can be unwashed or washed using any method known in the art, e.g., washed with water.
Mechanical Pretreatment or Physical Pretreatment: The term “mechanical pretreatment” or “physical pretreatment” refers to any pretreatment that promotes size reduction of particles. For example, such pretreatment can involve various types of grinding or milling (e.g., dry milling, wet milling, or vibratory ball milling).
The cellulosic material or xylan-containing material can be pretreated both physically (mechanically) and chemically. Mechanical or physical pretreatment can be coupled with steaming/steam explosion, hydrothermolysis, dilute or mild acid treatment, high temperature, high pressure treatment, irradiation (e.g., microwave irradiation), or combinations thereof. In one aspect, high pressure means pressure in the range of preferably about 100 to about 400 psi, e.g., about 150 to about 250 psi. In another aspect, high temperature means temperatures in the range of about 100 to about 300° C., e.g., about 140 to about 200° C. In a preferred aspect, mechanical or physical pretreatment is performed in a batch-process using a steam gun hydrolyzer system that uses high pressure and high temperature as defined above, e.g., a Sunds Hydrolyzer available from Sunds Defibrator AB, Sweden. The physical and chemical pretreatments can be carried out sequentially or simultaneously, as desired.
Accordingly, in a preferred aspect, the cellulosic material or xylan-containing material is subjected to physical (mechanical) or chemical pretreatment, or any combination thereof, to promote the separation and/or release of cellulose, hemicellulose, and/or lignin.
Biological Pretreatment: The term “biological pretreatment” refers to any biological pretreatment that promotes the separation and/or release of cellulose, hemicellulose, and/or lignin from the cellulosic material or xylan-containing material. Biological pretreatment techniques can involve applying lignin-solubilizing microorganisms and/or enzymes (see, for example, Hsu, T.-A., 1996, Pretreatment of biomass, in Handbook on Bioethanol: Production and Utilization , Wyman, C. E., ed., Taylor & Francis, Washington, D.C., 179-212; Ghosh and Singh, 1993, Physicochemical and biological treatments for enzymatic/microbial conversion of cellulosic biomass, Adv. Appl. Microbiol. 39: 295-333; McMillan, J. D., 1994, Pretreating lignocellulosic biomass: a review, in Enzymatic Conversion of Biomass for Fuels Production, Himmel, M. E., Baker, J. O., and Overend, R. P., eds., ACS Symposium Series 566, American Chemical Society, Washington, D.C., chapter 15; Gong, C. S., Cao, N. J., Du, J., and Tsao, G. T., 1999, Ethanol production from renewable resources, in Advances in Biochemical Engineering/Biotechnology , Scheper, T., ed., Springer-Verlag Berlin Heidelberg, Germany, 65: 207-241; Olsson and Hahn-Hagerdal, 1996, Fermentation of lignocellulosic hydrolysates for ethanol production, Enz. Microb. Tech. 18: 312-331; and Vallander and Eriksson, 1990, Production of ethanol from lignocellulosic materials: State of the art, Adv. Biochem. Eng./Biotechnol. 42: 63-95).
Saccharification.
In the hydrolysis step, also known as saccharification, the cellulosic material or xylan-containing material, e.g., pretreated, is hydrolyzed to break down cellulose and/or hemicellulose to fermentable sugars, such as glucose, cellobiose, xylose, xylulose, arabinose, mannose, galactose, and/or soluble oligosaccharides. The hydrolysis is performed enzymatically by an enzyme composition in the presence of a polypeptide having xylanase activity of the present invention. The enzymes of the compositions can be added simultaneously or sequentially.
Enzymatic hydrolysis is preferably carried out in a suitable aqueous environment under conditions that can be readily determined by one skilled in the art. In one aspect, hydrolysis is performed under conditions suitable for the activity of the enzyme(s), i.e., optimal for the enzyme(s). The hydrolysis can be carried out as a fed batch or continuous process where the cellulosic material or xylan-containing material is fed gradually to, for example, an enzyme containing hydrolysis solution.
The saccharification is generally performed in stirred-tank reactors or fermentors under controlled pH, temperature, and mixing conditions. Suitable process time, temperature and pH conditions can readily be determined by one skilled in the art. For example, the saccharification can last up to 200 hours, but is typically performed for preferably about 12 to about 120 hours, e.g., about 16 to about 72 hours or about 24 to about 48 hours. The temperature is in the range of preferably about 25° C. to about 70° C., e.g., about 30° C. to about 65° C., about 40° C. to about 60° C., or about 50° C. to about 55° C. The pH is in the range of preferably about 3 to about 8, e.g., about 3.5 to about 7, about 4 to about 6, or about 5.0 to about 5.5. The dry solids content is in the range of preferably about 5 to about 50 wt. %, e.g., about 10 to about 40 wt. % or about 20 to about 30 wt. %.
The enzyme compositions can comprise any protein useful in degrading the cellulosic material or xylan-containing material.
In one aspect, the enzyme composition comprises or further comprises one or more (e.g., several) proteins selected from the group consisting of a cellulase, a GH61 polypeptide having cellulolytic enhancing activity, a hemicellulase, an esterase, an expansin, a laccase, a ligninolytic enzyme, a pectinase, a peroxidase, a protease, and a swollenin. In another aspect, the hemicellulase is preferably one or more (e.g., several) enzymes selected from the group consisting of an acetylmannan esterase, an acetylxylan esterase, an arabinanase, an arabinofuranosidase, a coumaric acid esterase, a feruloyl esterase, a galactosidase, a glucuronidase, a glucuronoyl esterase, a mannanase, a mannosidase, a xylanase, and a xylosidase. In another aspect, the cellulase is preferably one or more (e.g., several) enzymes selected from the group consisting of an endoglucanase, a cellobiohydrolase, and a beta-glucosidase.
In another aspect, the enzyme composition comprises one or more (e.g., several) cellulolytic enzymes. In another aspect, the enzyme composition comprises or further comprises one or more (e.g., several) hemicellulolytic enzymes. In another aspect, the enzyme composition comprises one or more (e.g., several) cellulolytic enzymes and one or more (e.g., several) hemicellulolytic enzymes. In another aspect, the enzyme composition comprises one or more (e.g., several) enzymes selected from the group of cellulolytic enzymes and hemicellulolytic enzymes.
In another aspect, the enzyme composition comprises an acetylmannan esterase. In another aspect, the enzyme composition comprises an acetylxylan esterase. In another aspect, the enzyme composition comprises an arabinanase (e.g., alpha-L-arabinanase). In another aspect, the enzyme composition comprises an arabinofuranosidase (e.g., alpha-L-arabinofuranosidase). In another aspect, the enzyme composition comprises a coumaric acid esterase. In another aspect, the enzyme composition comprises a feruloyl esterase. In another aspect, the enzyme composition comprises a galactosidase (e.g., alpha-galactosidase and/or beta-galactosidase). In another aspect, the enzyme composition comprises a glucuronidase (e.g., alpha-D-glucuronidase). In another aspect, the enzyme composition comprises a glucuronoyl esterase. In another aspect, the enzyme composition comprises a mannanase. In another aspect, the enzyme composition comprises a mannosidase (e.g., beta-mannosidase). In another aspect, the enzyme composition comprises a xylanase. In a preferred aspect, the xylanase is a Family 10 xylanase. In another aspect, the enzyme composition comprises a xylosidase (e.g., beta-xylosidase).
In another aspect, the enzyme composition comprises an endoglucanase. In another aspect, the enzyme composition comprises a cellobiohydrolase. In another aspect, the enzyme composition comprises a beta-glucosidase. In another aspect, the enzyme composition comprises a polypeptide having cellulolytic enhancing activity. In another aspect, the enzyme composition comprises an endoglucanase and a polypeptide having cellulolytic enhancing activity. In another aspect, the enzyme composition comprises a cellobiohydrolase and a polypeptide having cellulolytic enhancing activity. In another aspect, the enzyme composition comprises a beta-glucosidase and a polypeptide having cellulolytic enhancing activity. In another aspect, the enzyme composition comprises an endoglucanase and a cellobiohydrolase. In another aspect, the enzyme composition comprises an endoglucanase and a beta-glucosidase. In another aspect, the enzyme composition comprises a cellobiohydrolase and a beta-glucosidase. In another aspect, the enzyme composition comprises an endoglucanase, a cellobiohydrolase, and a polypeptide having cellulolytic enhancing activity. In another aspect, the enzyme composition comprises an endoglucanase, a beta-glucosidase, and a polypeptide having cellulolytic enhancing activity. In another aspect, the enzyme composition comprises a cellobiohydrolase, a beta-glucosidase, and a polypeptide having cellulolytic enhancing activity. In another aspect, the enzyme composition comprises an endoglucanase, a cellobiohydrolase, and a beta-glucosidase. In another aspect, the enzyme composition comprises an endoglucanase, a cellobiohydrolase, a beta-glucosidase, and a polypeptide having cellulolytic enhancing activity.
In another aspect, the enzyme composition comprises an esterase. In another aspect, the enzyme composition comprises an expansin. In another aspect, the enzyme composition comprises a laccase. In another aspect, the enzyme composition comprises a ligninolytic enzyme. In a preferred aspect, the ligninolytic enzyme is a manganese peroxidase. In another preferred aspect, the ligninolytic enzyme is a lignin peroxidase. In another preferred aspect, the ligninolytic enzyme is a H 2 O 2 -producing enzyme. In another aspect, the enzyme composition comprises a pectinase. In another aspect, the enzyme composition comprises a peroxidase. In another aspect, the enzyme composition comprises a protease. In another aspect, the enzyme composition comprises a swollenin
In the processes of the present invention, the enzyme(s) can be added prior to or during fermentation, e.g., during saccharification or during or after propagation of the fermenting microorganism(s).
One or more (e.g., several) components of the enzyme composition may be wild-type proteins, recombinant proteins, or a combination of wild-type proteins and recombinant proteins. For example, one or more (e.g., several) components may be native proteins of a cell, which is used as a host cell to express recombinantly one or more (e.g., several) other components of the enzyme composition. One or more (e.g., several) components of the enzyme composition may be produced as monocomponents, which are then combined to form the enzyme composition. The enzyme composition may be a combination of multicomponent and monocomponent protein preparations.
The enzymes used in the processes of the present invention may be in any form suitable for use, such as, for example, a crude fermentation broth with or without cells removed, a cell lysate with or without cellular debris, a semi-purified or purified enzyme preparation, or a host cell as a source of the enzymes. The enzyme composition may be a dry powder or granulate, a non-dusting granulate, a liquid, a stabilized liquid, or a stabilized protected enzyme. Liquid enzyme preparations may, for instance, be stabilized by adding stabilizers such as a sugar, a sugar alcohol or another polyol, and/or lactic acid or another organic acid according to established processes.
The optimum amounts of the enzymes and polypeptides having xylanase activity depend on several factors including, but not limited to, the mixture of component cellulolytic enzymes, the cellulosic material or xylan-containing material, the concentration of cellulosic material or xylan-containing material, the pretreatment(s) of the cellulosic material or xylan-containing material, temperature, time, pH, and inclusion of fermenting organism (e.g., yeast for Simultaneous Saccharification and Fermentation).
In one aspect, an effective amount of cellulolytic or hemicellulolytic enzyme to the cellulosic material or xylan-containing material is about 0.5 to about 50 mg, e.g., about 0.5 to about 40 mg, about 0.5 to about 25 mg, about 0.75 to about 20 mg, about 0.75 to about 15 mg, about 0.5 to about 10 mg, or about 2.5 to about 10 mg per g of the cellulosic material or xylan-containing material.
In another aspect, an effective amount of a polypeptide having xylanase activity to the cellulosic material or xylan-containing material is about 0.01 to about 50.0 mg, e.g., about 0.01 to about 40 mg, about 0.01 to about 30 mg, about 0.01 to about 20 mg, about 0.01 to about 10 mg, about 0.01 to about 5 mg, about 0.025 to about 1.5 mg, about 0.05 to about 1.25 mg, about 0.075 to about 1.25 mg, about 0.1 to about 1.25 mg, about 0.15 to about 1.25 mg, or about 0.25 to about 1.0 mg per g of the cellulosic material or xylan-containing material.
In another aspect, an effective amount of a polypeptide having xylanase activity to cellulolytic or hemicellulolytic enzyme is about 0.005 to about 1.0 g, e.g., about 0.01 to about 1.0 g, about 0.15 to about 0.75 g, about 0.15 to about 0.5 g, about 0.1 to about 0.5 g, about 0.1 to about 0.25 g, or about 0.05 to about 0.2 g per g of cellulolytic or hemicellulolytic enzyme.
The polypeptides having cellulolytic enzyme activity or hemicellulolytic enzyme activity as well as other proteins/polypeptides useful in the degradation of the cellulosic material or xylan-containing material, e.g., GH61 polypeptides having cellulolytic enhancing activity (collectively hereinafter “polypeptides having enzyme activity”) can be derived or obtained from any suitable origin, including, bacterial, fungal, yeast, plant, or mammalian origin. The term “obtained” also means herein that the enzyme may have been produced recombinantly in a host organism employing methods described herein, wherein the recombinantly produced enzyme is either native or foreign to the host organism or has a modified amino acid sequence, e.g., having one or more (e.g., several) amino acids that are deleted, inserted and/or substituted, i.e., a recombinantly produced enzyme that is a mutant and/or a fragment of a native amino acid sequence or an enzyme produced by nucleic acid shuffling processes known in the art. Encompassed within the meaning of a native enzyme are natural variants and within the meaning of a foreign enzyme are variants obtained recombinantly, such as by site-directed mutagenesis or shuffling.
A polypeptide having enzyme activity may be a bacterial polypeptide. For example, the polypeptide may be a gram positive bacterial polypeptide such as a Bacillus, Streptococcus, Streptomyces, Staphylococcus, Enterococcus, Lactobacillus, Lactococcus, Clostridium, Geobacillus, Caldicellulosiruptor, Acidothermus, Thermobifidia , or Oceanobacillus polypeptide having enzyme activity, or a Gram negative bacterial polypeptide such as an E. coli, Pseudomonas, Salmonella, Campylobacter, Helicobacter, Flavobacterium, Fusobacterium, Ilyobacter, Neisseria , or Ureaplasma polypeptide having enzyme activity.
In one aspect, the polypeptide is a Bacillus alkalophilus, Bacillus amyloliquefaciens, Bacillus brevis, Bacillus circulans, Bacillus clausii, Bacillus coagulans, Bacillus firmus, Bacillus lautus, Bacillus lentus, Bacillus licheniformis, Bacillus megaterium, Bacillus pumilus, Bacillus stearothermophilus, Bacillus subtilis , or Bacillus thuringiensis polypeptide having enzyme activity.
In another aspect, the polypeptide is a Streptococcus equisimilis, Streptococcus pyogenes, Streptococcus uberis , or Streptococcus equi subsp. Zooepidemicus polypeptide having enzyme activity.
In another aspect, the polypeptide is a Streptomyces achromogenes, Streptomyces avermitilis, Streptomyces coelicolor, Streptomyces griseus , or Streptomyces lividans polypeptide having enzyme activity.
The polypeptide having enzyme activity may also be a fungal polypeptide, and more preferably a yeast polypeptide such as a Candida, Kluyveromyces, Pichia, Saccharomyces, Schizosaccharomyces , or Yarrowia polypeptide having enzyme activity; or more preferably a filamentous fungal polypeptide such as an Acremonium, Agaricus, Alternaria, Aspergillus, Aureobasidium, Botryospaeria, Ceriporiopsis, Chaetomidium, Chrysosporium, Claviceps, Cochliobolus, Coprinopsis, Coptotermes, Corynascus, Cryphonectria, Cryptococcus, Diplodia, Exidia, Filibasidium, Fusarium, Gibberella, Holomastigotoides, Humicola, Irpex, Lentinula, Leptospaeria, Magnaporthe, Melanocarpus, Meripilus, Mucor, Myceliophthora, Neocallimastix, Neurospora, Paecilomyces, Penicillium, Phanerochaete, Piromyces, Poitrasia, Pseudoplectania, Pseudotrichonympha, Rhizomucor, Schizophyllum, Scytalidium, Talaromyces, Thermoascus, Thielavia, Tolypocladium, Trichoderma, Trichophaea, Verticillium, Volvariella , or Xylaria polypeptide having enzyme activity.
In one aspect, the polypeptide is a Saccharomyces carlsbergensis, Saccharomyces cerevisiae, Saccharomyces diastaticus, Saccharomyces douglasii, Saccharomyces kluyveri, Saccharomyces norbensis , or Saccharomyces oviformis polypeptide having enzyme activity.
In another aspect, the polypeptide is an Acremonium cellulolyticus, Aspergillus aculeatus, Aspergillus awamori, Aspergillus fumigatus, Aspergillus foetidus, Aspergillus japonicus, Aspergillus nidulans, Aspergillus niger, Aspergillus oryzae, Chrysosporium keratinophilum, Chrysosporium lucknowense, Chrysosporium tropicum, Chrysosporium merdarium, Chrysosporium inops, Chrysosporium pannicola, Chrysosporium queenslandicum, Chrysosporium zonatum, Fusarium bactridioides, Fusarium cerealis, Fusarium crookwellense, Fusarium culmorum, Fusarium graminearum, Fusarium graminum, Fusarium heterosporum, Fusarium negundi, Fusarium oxysporum, Fusarium reticulatum, Fusarium roseum, Fusarium sambucinum, Fusarium sarcochroum, Fusarium sporotrichioides, Fusarium sulphureum, Fusarium torulosum, Fusarium trichothecioides, Fusarium venenatum, Humicola grisea, Humicola insolens, Humicola lanuginosa, Irpex lacteus, Mucor miehei, Myceliophthora thermophila, Neurospora crassa, Penicillium funiculosum, Penicillium purpurogenum, Phanerochaete chrysosporium, Thielavia achromatica, Thielavia albomyces, Thielavia albopilosa, Thielavia australeinsis, Thielavia fimeti, Thielavia microspora, Thielavia ovispora, Thielavia peruviana, Thielavia spededonium, Thielavia setosa, Thielavia subthermophila, Thielavia terrestris, Trichoderma harzianum, Trichoderma koningii, Trichoderma longibrachiatum, Trichoderma reesei, Trichoderma viride , or Trichophaea saccata polypeptide having enzyme activity.
Chemically modified or protein engineered mutants of polypeptides having enzyme activity may also be used.
One or more (e.g., several) components of the enzyme composition may be a recombinant component, i.e., produced by cloning of a DNA sequence encoding the single component and subsequent cell transformed with the DNA sequence and expressed in a host (see, for example, WO 91/17243 and WO 91/17244). The host is preferably a heterologous host (enzyme is foreign to host), but the host may under certain conditions also be a homologous host (enzyme is native to host). Monocomponent cellulolytic proteins may also be prepared by purifying such a protein from a fermentation broth.
In one aspect, the one or more (e.g., several) cellulolytic enzymes comprise a commercial cellulolytic enzyme preparation. Examples of commercial cellulolytic enzyme preparations suitable for use in the present invention include, for example, CELLIC™ CTec (Novozymes A/S), CELLIC™ CTec2 (Novozymes A/S), CELLUCLAST™ (Novozymes A/S), NOVOZYM™ 188 (Novozymes A/S), CELLUZYME™ (Novozymes A/S), CEREFLO™ (Novozymes A/S), and ULTRAFLO™ (Novozymes A/S), ACCELERASE™ (Genencor Int.), LAMINEX™ (Genencor Int.), SPEZYME™ CP (Genencor Int.), FILTRASE® NL (DSM); METHAPLUS® S/L 100 (DSM). ROHAMENT™ 7069 W (Röhm GmbH), FIBREZYME® LDI (Dyadic International, Inc.), FIBREZYME® LBR (Dyadic International, Inc.), or VISCOSTAR® 150 L (Dyadic International, Inc.). The cellulase enzymes are added in amounts effective from about 0.001 to about 5.0 wt. % of solids, e.g., about 0.025 to about 4.0 wt. % of solids or about 0.005 to about 2.0 wt. % of solids.
Examples of bacterial endoglucanases that can be used in the processes of the present invention, include, but are not limited to, an Acidothermus cellulolyticus endoglucanase (WO 91/05039; WO 93/15186; U.S. Pat. No. 5,275,944; WO 96/02551; U.S. Pat. No. 5,536,655, WO 00/70031, WO 05/093050); Thermobifida fusca endoglucanase III (WO 05/093050); and Thermobifida fusca endoglucanase V (WO 05/093050).
Examples of fungal endoglucanases that can be used in the present invention, include, but are not limited to, a Trichoderma reesei endoglucanase I (Penttila et al., 1986 , Gene 45: 253-263, Trichoderma reesei Cel7B endoglucanase I (GENBANK™ accession no. M15665), Trichoderma reesei endoglucanase II (Saloheimo, et al., 1988 , Gene 63:11-22), Trichoderma reesei Cel5A endoglucanase II (GENBANK™ accession no. M19373), Trichoderma reesei endoglucanase III (Okada et al., 1988 , Appl. Environ. Microbiol. 64: 555-563, GENBANK™ accession no. AB003694), Trichoderma reesei endoglucanase V (Saloheimo et al., 1994 , Molecular Microbiology 13: 219-228, GENBANK™ accession no. Z33381), Aspergillus aculeatus endoglucanase (Ooi et al., 1990 , Nucleic Acids Research 18: 5884), Aspergillus kawachii endoglucanase (Sakamoto et al., 1995 , Current Genetics 27: 435-439), Erwinia carotovara endoglucanase (Saarilahti et al., 1990 , Gene 90: 9-14), Fusarium oxysporum endoglucanase (GENBANK™ accession no. L29381), Humicola grisea var. thermoidea endoglucanase (GENBANK™ accession no. AB003107), Melanocarpus albomyces endoglucanase (GENBANK™ accession no. MAL515703), Neurospora crassa endoglucanase (GENBANK™ accession no. XM — 324477), Humicola insolens endoglucanase V, Myceliophthora thermophila CBS 117.65 endoglucanase, basidiomycete CBS 495.95 endoglucanase, basidiomycete CBS 494.95 endoglucanase, Thielavia terrestris NRRL 8126 CEL6B endoglucanase, Thielavia terrestris NRRL 8126 CEL6C endoglucanase, Thielavia terrestris NRRL 8126 CEL7C endoglucanase, Thielavia terrestris NRRL 8126 CEL7E endoglucanase, Thielavia terrestris NRRL 8126 CEL7F endoglucanase, Cladorrhinum foecundissimum ATCC 62373 CEL7A endoglucanase, and Trichoderma reesei strain No. VTT-D-80133 endoglucanase (GENBANK™ accession no. M15665).
Examples of cellobiohydrolases useful in the present invention include, but are not limited to, Aspergillus aculeatus cellobiohydrolase II (WO 2011/059740), Chaetomium thermophilum cellobiohydrolase I, Chaetomium thermophilum cellobiohydrolase II, Humicola insolens cellobiohydrolase I, Myceliophthora thermophila cellobiohydrolase II (WO 2009/042871), Thielavia hyrcanie cellobiohydrolase II (WO 2010/141325), Thielavia terrestris cellobiohydrolase II (CEL6A, WO 2006/074435), Trichoderma reesei cellobiohydrolase I, Trichoderma reesei cellobiohydrolase II, and Trichophaea saccata cellobiohydralase II (WO 2010/057086).
Examples of beta-glucosidases useful in the present invention include, but are not limited to, beta-glucosidases from Aspergillus aculeatus (Kawaguchi et al., 1996 , Gene 173: 287-288), Aspergillus fumigatus (WO 2005/047499), Aspergillus niger (Dan et al., 2000 , J. Biol. Chem. 275: 4973-4980), Aspergillus oryzae (WO 2002/095014), Penicillium brasilianum IBT 20888 (WO 2007/019442 and WO 2010/088387), Thielavia terrestris (WO 2011/035029), and Trichophaea saccata (WO 2007/019442).
The beta-glucosidase may be a fusion protein. In one aspect, the beta-glucosidase is an Aspergillus oryzae beta-glucosidase variant BG fusion protein (WO 2008/057637) or an Aspergillus oryzae beta-glucosidase fusion protein (WO 2008/057637.
Other useful endoglucanases, cellobiohydrolases, and beta-glucosidases are disclosed in numerous Glycosyl Hydrolase families using the classification according to Henrissat, 1991, A classification of glycosyl hydrolases based on amino-acid sequence similarities, Biochem. J. 280: 309-316, and Henrissat and Bairoch, 1996, Updating the sequence-based classification of glycosyl hydrolases, Biochem. J. 316: 695-696.
Other cellulolytic enzymes that may be used in the present invention are described in WO 98/13465, WO 98/015619, WO 98/015633, WO 99/06574, WO 99/10481, WO 99/025847, WO 99/031255, WO 2002/101078, WO 2003/027306, WO 2003/052054, WO 2003/052055, WO 2003/052056, WO 2003/052057, WO 2003/052118, WO 2004/016760, WO 2004/043980, WO 2004/048592, WO 2005/001065, WO 2005/028636, WO 2005/093050, WO 2005/093073, WO 2006/074005, WO 2006/117432, WO 2007/071818, WO 2007/071820, WO 2008/008070, WO 2008/008793, U.S. Pat. No. 5,457,046, U.S. Pat. No. 5,648,263, and U.S. Pat. No. 5,686,593.
In the processes of the present invention, any GH61 polypeptide having cellulolytic enhancing activity can be used.
Examples of GH61 polypeptides having cellulolytic enhancing activity useful in the processes of the present invention include, but are not limited to, GH61 polypeptides from Thielavia terrestris (WO 2005/074647, WO 2008/148131, and WO 2011/035027), Thermoascus aurantiacus (WO 2005/074656 and WO 2010/065830), Trichoderma reesei (WO 2007/089290), Myceliophthora thermophila (WO 2009/085935, WO 2009/085859, WO 2009/085864, WO 2009/085868), Aspergillus fumigatus (WO 2010/138754), GH61 polypeptides from Penicillium pinophilum (WO 2011/005867), Thermoascus sp. (WO 2011/039319), Penicillium sp. (WO 2011/041397), and Thermoascus crustaceous (WO 2011/041504).
In one aspect, the GH61 polypeptide having cellulolytic enhancing activity is used in the presence of a soluble activating divalent metal cation according to WO 2008/151043, e.g., manganese sulfate.
In one aspect, the GH61 polypeptide having cellulolytic enhancing activity is used in the presence of a dioxy compound, a bicylic compound, a heterocyclic compound, a nitrogen-containing compound, a quinone compound, a sulfur-containing compound, or a liquor obtained from a pretreated cellulosic material or xylan-containing material such as pretreated corn stover (PCS).
The dioxy compound may include any suitable compound containing two or more oxygen atoms. In some aspects, the dioxy compounds contain a substituted aryl moiety as described herein. The dioxy compounds may comprise one or more (e.g., several) hydroxyl and/or hydroxyl derivatives, but also include substituted aryl moieties lacking hydroxyl and hydroxyl derivatives. Non-limiting examples of the dioxy compounds include pyrocatechol or catechol; caffeic acid; 3,4-dihydroxybenzoic acid; 4-tert-butyl-5-methoxy-1,2-benzenediol; pyrogallol; gallic acid; methyl-3,4,5-trihydroxybenzoate; 2,3,4-trihydroxybenzophenone; 2,6-dimethoxyphenol; sinapinic acid; 3,5-dihydroxybenzoic acid; 4-chloro-1,2-benzenediol; 4-nitro-1,2-benzenediol; tannic acid; ethyl gallate; methyl glycolate; dihydroxyfumaric acid; 2-butyne-1,4-diol; (croconic acid; 1,3-propanediol; tartaric acid; 2,4-pentanediol; 3-ethyoxy-1,2-propanediol; 2,4,4′-trihydroxybenzophenone; cis-2-butene-1,4-diol; 3,4-dihydroxy-3-cyclobutene-1,2-dione; dihydroxyacetone; acrolein acetal; methyl-4-hydroxybenzoate; 4-hydroxybenzoic acid; and methyl-3,5-dimethoxy-4-hydroxybenzoate; or a salt or solvate thereof.
The bicyclic compound may include any suitable substituted fused ring system as described herein. The compounds may comprise one or more (e.g., several) additional rings, and are not limited to a specific number of rings unless otherwise stated. In one aspect, the bicyclic compound is a flavonoid. In another aspect, the bicyclic compound is an optionally substituted isoflavonoid. In another aspect, the bicyclic compound is an optionally substituted flavylium ion, such as an optionally substituted anthocyanidin or optionally substituted anthocyanin, or derivative thereof. Non-limiting examples of the bicyclic compounds include epicatechin; quercetin; myricetin; taxifolin; kaempferol; morin; acacetin; naringenin; isorhamnetin; apigenin; cyanidin; cyanin; kuromanin; keracyanin; or a salt or solvate thereof.
The heterocyclic compound may be any suitable compound, such as an optionally substituted aromatic or non-aromatic ring comprising a heteroatom, as described herein. In one aspect, the heterocyclic is a compound comprising an optionally substituted heterocycloalkyl moiety or an optionally substituted heteroaryl moiety. In another aspect, the optionally substituted heterocycloalkyl moiety or optionally substituted heteroaryl moiety is an optionally substituted 5-membered heterocycloalkyl or an optionally substituted 5-membered heteroaryl moiety. In another aspect, the optionally substituted heterocycloalkyl or optionally substituted heteroaryl moiety is an optionally substituted moiety selected from pyrazolyl, furanyl, imidazolyl, isoxazolyl, oxadiazolyl, oxazolyl, pyrrolyl, pyridyl, pyrimidyl, pyridazinyl, thiazolyl, triazolyl, thienyl, dihydrothieno-pyrazolyl, thianaphthenyl, carbazolyl, benzimidazolyl, benzothienyl, benzofuranyl, indolyl, quinolinyl, benzotriazolyl, benzothiazolyl, benzooxazolyl, benzimidazolyl, isoquinolinyl, isoindolyl, acridinyl, benzoisazolyl, dimethylhydantoin, pyrazinyl, tetrahydrofuranyl, pyrrolinyl, pyrrolidinyl, morpholinyl, indolyl, diazepinyl, azepinyl, thiepinyl, piperidinyl, and oxepinyl. In another aspect, the optionally substituted heterocycloalkyl moiety or optionally substituted heteroaryl moiety is an optionally substituted furanyl. Non-limiting examples of the heterocyclic compounds include (1,2-dihydroxyethyl)-3,4-dihydroxyfuran-2(5H)-one; 4-hydroxy-5-methyl-3-furanone; 5-hydroxy-2(5H)-furanone; [1,2-dihydroxyethyl]furan-2,3,4(5H)-trione; α-hydroxy-γ-butyrolactone; ribonic γ-lactone; aldohexuronicaldohexuronic acid γ-lactone; gluconic acid δ-lactone; 4-hydroxycoumarin; dihydrobenzofuran; 5-(hydroxymethyl)furfural; furoin; 2(5H)-furanone; 5,6-dihydro-2H-pyran-2-one; and 5,6-dihydro-4-hydroxy-6-methyl-2H-pyran-2-one; or a salt or solvate thereof.
The nitrogen-containing compound may be any suitable compound with one or more nitrogen atoms. In one aspect, the nitrogen-containing compound comprises an amine, imine, hydroxylamine, or nitroxide moiety. Non-limiting examples of the nitrogen-containing compounds include acetone oxime; violuric acid; pyridine-2-aldoxime; 2-aminophenol; 1,2-benzenediamine; 2,2,6,6-tetramethyl-1-piperidinyloxy; 5,6,7,8-tetrahydrobiopterin; 6,7-dimethyl-5,6,7,8-tetrahydropterine; and maleamic acid; or a salt or solvate thereof.
The quinone compound may be any suitable compound comprising a quinone moiety as described herein. Non-limiting examples of the quinone compounds include 1,4-benzoquinone; 1,4-naphthoquinone; 2-hydroxy-1,4-naphthoquinone; 2,3-dimethoxy-5-methyl-1,4-benzoquinone or coenzyme Q 0 ; 2,3,5,6-tetramethyl-1,4-benzoquinone or duroquinone; 1,4-dihydroxyanthraquinone; 3-hydroxy-1-methyl-5,6-indolinedione or adrenochrome; 4-tert-butyl-5-methoxy-1,2-benzoquinone; pyrroloquinoline quinone; or a salt or solvate thereof.
The sulfur-containing compound may be any suitable compound comprising one or more sulfur atoms. In one aspect, the sulfur-containing comprises a moiety selected from thionyl, thioether, sulfinyl, sulfonyl, sulfamide, sulfonamide, sulfonic acid, and sulfonic ester. Non-limiting examples of the sulfur-containing compounds include ethanethiol; 2-propanethiol; 2-propene-1-thiol; 2-mercaptoethanesulfonic acid; benzenethiol; benzene-1,2-dithiol; cysteine; methionine; glutathione; cystine; or a salt or solvate thereof.
In one aspect, an effective amount of such a compound described above to cellulosic material or xylan-containing material as a molar ratio to glucosyl units of cellulose is about 10 −6 to about 10, e.g., about 10 −6 to about 7.5, about 10 −6 to about 5, about 10 −6 to about 2.5, about 10 −6 to about 1, about 10 −5 to about 1, about 10 −5 to about 10 −1 , about 10 −4 to about 10 −1 , about 10 −3 to about 10 −1 , or about 10 −3 to about 10 −2 . In another aspect, an effective amount of such a compound described above is about 0.1 μM to about 1 M, e.g., about 0.5 μM to about 0.75 M, about 0.75 μM to about 0.5 M, about 1 μM to about 0.25 M, about 1 μM to about 0.1 M, about 5 μM to about 50 mM, about 10 μM to about 25 mM, about 50 μM to about 25 mM, about 10 μM to about 10 mM, about 5 μM to about 5 mM, or about 0.1 mM to about 1 mM.
The term “liquor” means the solution phase, either aqueous, organic, or a combination thereof, arising from treatment of a lignocellulose and/or hemicellulose material in a slurry, or monosaccharides thereof, e.g., xylose, arabinose, mannose, etc., under conditions as described herein, and the soluble contents thereof. A liquor for cellulolytic enhancement of a GH61 polypeptide can be produced by treating a lignocellulose or hemicellulose material (or feedstock) by applying heat and/or pressure, optionally in the presence of a catalyst, e.g., acid, optionally in the presence of an organic solvent, and optionally in combination with physical disruption of the material, and then separating the solution from the residual solids. Such conditions determine the degree of cellulolytic enhancement obtainable through the combination of liquor and a GH61 polypeptide during hydrolysis of a cellulosic substrate by a cellulase preparation. The liquor can be separated from the treated material using a method standard in the art, such as filtration, sedimentation, or centrifugation.
In one aspect, an effective amount of the liquor to cellulose is about 10 −6 to about 10 g per g of cellulose, e.g., about 10 −6 to about 7.5 g, about 10 −6 to about 5, about 10 −6 to about 2.5 g, about 10 −6 to about 1 g, about 10 −5 to about 1 g, about 10 −5 to about 10 −1 g, about 10 −4 to about 10 −1 g, about 10 −3 to about 10 −1 g, or about 10 −3 to about 10 −2 g per g of cellulose.
In one aspect, the one or more (e.g., several) hemicellulolytic enzymes comprise a commercial hemicellulolytic enzyme preparation. Examples of commercial hemicellulolytic enzyme preparations suitable for use in the present invention include, for example, SHEARZYME™ (Novozymes A/S), CELLIC™ HTec (Novozymes A/S), CELLIC™ HTec2 (Novozymes A/S), VISCOZYME® (Novozymes A/S), ULTRAFLO® (Novozymes A/S), PULPZYME® HC (Novozymes A/S), MULTIFECT® Xylanase (Genencor), ACCELLERASE® XY (Genencor), ACCELLERASE® XC (Genencor), ECOPULP® TX-200A (AB Enzymes), HSP 6000 Xylanase (DSM), DEPOL™ 333P (Biocatalysts Limit, Wales, UK), DEPOL™ 740 L. (Biocatalysts Limit, Wales, UK), and DEPOL™ 762P (Biocatalysts Limit, Wales, UK).
Examples of xylanases useful in the processes of the present invention include, but are not limited to, xylanases from Aspergillus aculeatus (GeneSeqP:AAR63790; WO 94/21785), Aspergillus fumigatus (WO 2006/078256), Penicillium pinophilum (WO 2011/041405), Penicillium sp. (WO 2010/126772), Thielavia terrestris NRRL 8126 (WO 2009/079210), and Trichophaea saccata GH10 (WO 2011/057083).
Examples of beta-xylosidases useful in the processes of the present invention include, but are not limited to, beta-xylosidases from Neurospora crassa (SwissProt accession number Q7SOW4), Trichoderma reesei (UniProtKB/TrEMBL accession number Q92458), and Talaromyces emersonii (SwissProt accession number Q8X212).
Examples of acetylxylan esterases useful in the processes of the present invention include, but are not limited to, acetylxylan esterases from Aspergillus aculeatus (WO 2010/108918), Chaetomium globosum (Uniprot accession number Q2GWX4), Chaetomium gracile (GeneSeqP accession number AAB82124), Humicola insolens DSM 1800 (WO 2009/073709), Hypocrea jecorina (WO 2005/001036), Myceliophtera thermophila (WO 2010/014880), Neurospora crassa (UniProt accession number q7s259), Phaeosphaeria nodorum (Uniprot accession number Q0UHJ1), and Thielavia terrestris NRRL 8126 (WO 2009/042846).
Examples of feruloyl esterases (ferulic acid esterases) useful in the processes of the present invention include, but are not limited to, feruloyl esterases form Humicola insolens DSM 1800 (WO 2009/076122), Neosartorya fischeri (UniProt Accession number A1D9T4), Neurospora crassa (UniProt accession number Q9HGR3), Penicillium aurantiogriseum (WO 2009/127729), and Thielavia terrestris (WO 2010/053838 and WO 2010/065448).
Examples of arabinofuranosidases useful in the processes of the present invention include, but are not limited to, arabinofuranosidases from Aspergillus niger (GeneSeqP accession number AAR94170), Humicola insolens DSM 1800 (WO 2006/114094 and WO 2009/073383), and M. giganteus (WO 2006/114094).
Examples of alpha-glucuronidases useful in the processes of the present invention include, but are not limited to, alpha-glucuronidases from Aspergillus clavatus (UniProt accession number alcc12), Aspergillus fumigatus (SwissProt accession number Q4WW45), Aspergillus niger (Uniprot accession number Q96WX9), Aspergillus terreus (SwissProt accession number Q0CJP9), Humicola insolens (WO 2010/014706), Penicillium aurantiogriseum (WO 2009/068565), Talaromyces emersonii (UniProt accession number Q8×211), and Trichoderma reesei (Uniprot accession number Q99024).
The polypeptides having enzyme activity used in the processes of the present invention may be produced by fermentation of the above-noted microbial strains on a nutrient medium containing suitable carbon and nitrogen sources and inorganic salts, using procedures known in the art (see, e.g., Bennett, J. W. and LaSure, L. (eds.), More Gene Manipulations in Fungi , Academic Press, CA, 1991). Suitable media are available from commercial suppliers or may be prepared according to published compositions (e.g., in catalogues of the American Type Culture Collection). Temperature ranges and other conditions suitable for growth and enzyme production are known in the art (see, e.g., Bailey, J. E., and Ollis, D. F., Biochemical Engineering Fundamentals , McGraw-Hill Book Company, NY, 1986).
The fermentation can be any method of cultivation of a cell resulting in the expression or isolation of an enzyme or protein. Fermentation may, therefore, be understood as comprising shake flask cultivation, or small- or large-scale fermentation (including continuous, batch, fed-batch, or solid state fermentations) in laboratory or industrial fermentors performed in a suitable medium and under conditions allowing the enzyme to be expressed or isolated. The resulting enzymes produced by the methods described above may be recovered from the fermentation medium and purified by conventional procedures.
Fermentation.
The fermentable sugars obtained from the hydrolyzed cellulosic material or xylan-containing material can be fermented by one or more (e.g., several) fermenting microorganisms capable of fermenting the sugars directly or indirectly into a desired fermentation product. “Fermentation” or “fermentation process” refers to any fermentation process or any process comprising a fermentation step. Fermentation processes also include fermentation processes used in the consumable alcohol industry (e.g., beer and wine), dairy industry (e.g., fermented dairy products), leather industry, and tobacco industry. The fermentation conditions depend on the desired fermentation product and fermenting organism and can easily be determined by one skilled in the art.
In the fermentation step, sugars, released from the cellulosic material or xylan-containing material as a result of the pretreatment and enzymatic hydrolysis steps, are fermented to a product, e.g., ethanol, by a fermenting organism, such as yeast. Hydrolysis (saccharification) and fermentation can be separate or simultaneous, as described herein.
Any suitable hydrolyzed cellulosic material or xylan-containing material can be used in the fermentation step in practicing the present invention. The material is generally selected based on the desired fermentation product, i.e., the substance to be obtained from the fermentation, and the process employed, as is well known in the art.
The term “fermentation medium” is understood herein to refer to a medium before the fermenting microorganism(s) is(are) added, such as, a medium resulting from a saccharification process, as well as a medium used in a simultaneous saccharification and fermentation process (SSF).
“Fermenting microorganism” refers to any microorganism, including bacterial and fungal organisms, suitable for use in a desired fermentation process to produce a fermentation product. The fermenting organism can be hexose and/or pentose fermenting organisms, or a combination thereof. Both hexose and pentose fermenting organisms are well known in the art. Suitable fermenting microorganisms are able to ferment, i.e., convert, sugars, such as glucose, xylose, xylulose, arabinose, maltose, mannose, galactose, and/or oligosaccharides, directly or indirectly into the desired fermentation product. Examples of bacterial and fungal fermenting organisms producing ethanol are described by Lin et al., 2006 , Appl. Microbiol. Biotechnol. 69: 627-642.
Examples of fermenting microorganisms that can ferment hexose sugars include bacterial and fungal organisms, such as yeast. Preferred yeast includes strains of Candida, Kluyveromyces , and Saccharomyces , e.g., Candida sonorensis, Kluyveromyces marxianus , and Saccharomyces cerevisiae.
Examples of fermenting organisms that can ferment pentose sugars in their native state include bacterial and fungal organisms, such as some yeast. Preferred xylose fermenting yeast include strains of Candida , preferably C. sheatae or C. sonorensis ; and strains of Pichia , preferably P. stipitis , such as P. stipitis CBS 5773. Preferred pentose fermenting yeast include strains of Pachysolen , preferably P. tannophilus . Organisms not capable of fermenting pentose sugars, such as xylose and arabinose, may be genetically modified to do so by methods known in the art.
Examples of bacteria that can efficiently ferment hexose and pentose to ethanol include, for example, Bacillus coagulans, Clostridium acetobutylicum, Clostridium thermocellum, Clostridium phytofermentans, Geobacillus sp., Thermoanaerobacter saccharolyticum, and Zymomonas mobilis (Philippidis, 1996, supra).
Other fermenting organisms include strains of Bacillus , such as Bacillus coagulans; Candida , such as C. sonorensis, C. methanosorbosa, C. diddensiae, C. parapsilosis, C. naedodendra, C. blankii, C. entomophilia, C. brassicae, C. pseudotropicalis, C. boidinii, C. utilis , and C. scehatae; Clostridium , such as C. acetobutylicum, C. thermocellum , and C. phytofermentans; E. coli , especially E. coli strains that have been genetically modified to improve the yield of ethanol; Geobacillus sp.; Hansenula , such as Hansenula anomala; Klebsiella , such as K. oxytoca; Kluyveromyces , such as K. marxianus, K. lactis, K thermotolerans , and K. fragilis; Schizosaccharomyces , such as S. pombe; Thermoanaerobacter , such as Thermoanaerobacter saccharolyticum ; and Zymomonas , such as Zymomonas mobilis.
In a preferred aspect, the yeast is a Bretannomyces . In a more preferred aspect, the yeast is Bretannomyces clausenii . In another preferred aspect, the yeast is a Candida . In another more preferred aspect, the yeast is Candida sonorensis . In another more preferred aspect, the yeast is Candida boidinii . In another more preferred aspect, the yeast is Candida blankii . In another more preferred aspect, the yeast is Candida brassicae . In another more preferred aspect, the yeast is Candida diddensii . In another more preferred aspect, the yeast is Candida entomophiliia . In another more preferred aspect, the yeast is Candida pseudotropicalis . In another more preferred aspect, the yeast is Candida scehatae . In another more preferred aspect, the yeast is Candida utilis . In another preferred aspect, the yeast is a Clavispora . In another more preferred aspect, the yeast is Clavispora lusitaniae . In another more preferred aspect, the yeast is Clavispora opuntiae . In another preferred aspect, the yeast is a Kluyveromyces . In another more preferred aspect, the yeast is Kluyveromyces fragilis . In another more preferred aspect, the yeast is Kluyveromyces marxianus . In another more preferred aspect, the yeast is Kluyveromyces thermotolerans . In another preferred aspect, the yeast is a Pachysolen . In another more preferred aspect, the yeast is Pachysolen tannophilus . In another preferred aspect, the yeast is a Pichia . In another more preferred aspect, the yeast is a Pichia stipitis . In another preferred aspect, the yeast is a Saccharomyces spp. In a more preferred aspect, the yeast is Saccharomyces cerevisiae . In another more preferred aspect, the yeast is Saccharomyces distaticus . In another more preferred aspect, the yeast is Saccharomyces uvarum.
In a preferred aspect, the bacterium is a Bacillus . In a more preferred aspect, the bacterium is Bacillus coagulans . In another preferred aspect, the bacterium is a Clostridium . In another more preferred aspect, the bacterium is Clostridium acetobutylicum . In another more preferred aspect, the bacterium is Clostridium phytofermentans . In another more preferred aspect, the bacterium is Clostridium thermocellum . In another more preferred aspect, the bacterium is Geobacilus sp. In another more preferred aspect, the bacterium is a Thermoanaerobacter . In another more preferred aspect, the bacterium is Thermoanaerobacter saccharolyticum . In another preferred aspect, the bacterium is a Zymomonas . In another more preferred aspect, the bacterium is Zymomonas mobilis.
Commercially available yeast suitable for ethanol production include, e.g., BIOFERM™ AFT and XR (NABC—North American Bioproducts Corporation, GA, USA), ETHANOL RED™ yeast (Fermentis/Lesaffre, USA), FALI™ (Fleischmann's Yeast, USA), FERMIOL™ (DSM Specialties), GERT STRAND™ (Gert Strand AB, Sweden), and SUPERSTART™ and THERMOSACC™ fresh yeast (Ethanol Technology, WI, USA).
In a preferred aspect, the fermenting microorganism has been genetically modified to provide the ability to ferment pentose sugars, such as xylose utilizing, arabinose utilizing, and xylose and arabinose co-utilizing microorganisms.
The cloning of heterologous genes into various fermenting microorganisms has led to the construction of organisms capable of converting hexoses and pentoses to ethanol (co-fermentation) (Chen and Ho, 1993, Cloning and improving the expression of Pichia stipitis xylose reductase gene in Saccharomyces cerevisiae, Appl. Biochem. Biotechnol. 39-40: 135-147; Ho et al., 1998, Genetically engineered Saccharomyces yeast capable of effectively cofermenting glucose and xylose, Appl. Environ. Microbiol. 64: 1852-1859; Kotter and Ciriacy, 1993, Xylose fermentation by Saccharomyces cerevisiae, Appl. Microbiol. Biotechnol. 38: 776-783; Walfridsson et al., 1995, Xylose-metabolizing Saccharomyces cerevisiae strains overexpressing the TKL1 and TAL1 genes encoding the pentose phosphate pathway enzymes transketolase and transaldolase, Appl. Environ. Microbiol. 61: 4184-4190; Kuyper et al., 2004, Minimal metabolic engineering of Saccharomyces cerevisiae for efficient anaerobic xylose fermentation: a proof of principle, FEMS Yeast Research 4: 655-664; Beall et al., 1991, Parametric studies of ethanol production from xylose and other sugars by recombinant Escherichia coli, Biotech. Bioeng. 38: 296-303; Ingram et al., 1998, Metabolic engineering of bacteria for ethanol production, Biotechnol. Bioeng. 58: 204-214; Zhang et al., 1995, Metabolic engineering of a pentose metabolism pathway in ethanologenic Zymomonas mobilis, Science 267: 240-243; Deanda et al., 1996, Development of an arabinose-fermenting Zymomonas mobilis strain by metabolic pathway engineering, Appl. Environ. Microbiol. 62: 4465-4470; WO 2003/062430, xylose isomerase).
In a preferred aspect, the genetically modified fermenting microorganism is Candida sonorensis. In another preferred aspect, the genetically modified fermenting microorganism is Escherichia coli . In another preferred aspect, the genetically modified fermenting microorganism is Klebsiella oxytoca . In another preferred aspect, the genetically modified fermenting microorganism is Kluyveromyces marxianus . In another preferred aspect, the genetically modified fermenting microorganism is Saccharomyces cerevisiae . In another preferred aspect, the genetically modified fermenting microorganism is Zymomonas mobilis.
It is well known in the art that the organisms described above can also be used to produce other substances, as described herein.
The fermenting microorganism is typically added to the degraded cellulosic material or xylan-containing material or hydrolysate and the fermentation is performed for about 8 to about 96 hours, e.g., about 24 to about 60 hours. The temperature is typically between about 26° C. to about 60° C., e.g., about 32° C. or 50° C., and about pH 3 to about pH 8, e.g., pH 4-5, 6, or 7.
In one aspect, the yeast and/or another microorganism are applied to the degraded cellulosic material or xylan-containing material and the fermentation is performed for about 12 to about 96 hours, such as typically 24-60 hours. In another aspect, the temperature is preferably between about 20° C. to about 60° C., e.g., about 25° C. to about 50° C., about 32° C. to about 50° C., or about 32° C. to about 50° C., and the pH is generally from about pH 3 to about pH 7, e.g., about pH 4 to about pH 7. However, some fermenting organisms, e.g., bacteria, have higher fermentation temperature optima. Yeast or another microorganism is preferably applied in amounts of approximately 10 5 to 10 12 , preferably from approximately 10 7 to 10 10 , especially approximately 2×10 8 viable cell count per ml of fermentation broth. Further guidance in respect of using yeast for fermentation can be found in, e.g., “The Alcohol Textbook” (Editors K. Jacques, T. P. Lyons and D. R. Kelsall, Nottingham University Press, United Kingdom 1999), which is hereby incorporated by reference.
For ethanol production, following the fermentation the fermented slurry is distilled to extract the ethanol. The ethanol obtained according to the processes of the invention can be used as, e.g., fuel ethanol, drinking ethanol, i.e., potable neutral spirits, or industrial ethanol.
A fermentation stimulator can be used in combination with any of the processes described herein to further improve the fermentation process, and in particular, the performance of the fermenting microorganism, such as, rate enhancement and ethanol yield. A “fermentation stimulator” refers to stimulators for growth of the fermenting microorganisms, in particular, yeast. Preferred fermentation stimulators for growth include vitamins and minerals. Examples of vitamins include multivitamins, biotin, pantothenate, nicotinic acid, meso-inositol, thiamine, pyridoxine, para-aminobenzoic acid, folic acid, riboflavin, and Vitamins A, B, C, D, and E. See, for example, Alfenore et al., Improving ethanol production and viability of Saccharomyces cerevisiae by a vitamin feeding strategy during fed-batch process, Springer-Verlag (2002), which is hereby incorporated by reference. Examples of minerals include minerals and mineral salts that can supply nutrients comprising P, K, Mg, S, Ca, Fe, Zn, Mn, and Cu.
Fermentation Products:
A fermentation product can be any substance derived from the fermentation. The fermentation product can be, without limitation, an alcohol (e.g., arabinitol, n-butanol, isobutanol, ethanol, glycerol, methanol, ethylene glycol, 1,3-propanediol [propylene glycol], butanediol, glycerin, sorbitol, and xylitol); an alkane (e.g., pentane, hexane, heptane, octane, nonane, decane, undecane, and dodecane), a cycloalkane (e.g., cyclopentane, cyclohexane, cycloheptane, and cyclooctane), an alkene (e.g. pentene, hexene, heptene, and octene); an amino acid (e.g., aspartic acid, glutamic acid, glycine, lysine, serine, and threonine); a gas (e.g., methane, hydrogen (H 2 ), carbon dioxide (CO 2 ), and carbon monoxide (CO)); isoprene; a ketone (e.g., acetone); an organic acid (e.g., acetic acid, acetonic acid, adipic acid, ascorbic acid, citric acid, 2,5-diketo-D-gluconic acid, formic acid, fumaric acid, glucaric acid, gluconic acid, glucuronic acid, glutaric acid, 3-hydroxypropionic acid, itaconic acid, lactic acid, malic acid, malonic acid, oxalic acid, oxaloacetic acid, propionic acid, succinic acid, and xylonic acid); and polyketide. The fermentation product can also be protein as a high value product.
In a preferred aspect, the fermentation product is an alcohol. It will be understood that the term “alcohol” encompasses a substance that contains one or more hydroxyl moieties. In a more preferred aspect, the alcohol is n-butanol. In another more preferred aspect, the alcohol is isobutanol. In another more preferred aspect, the alcohol is ethanol. In another more preferred aspect, the alcohol is methanol. In another more preferred aspect, the alcohol is arabinitol. In another more preferred aspect, the alcohol is butanediol. In another more preferred aspect, the alcohol is ethylene glycol. In another more preferred aspect, the alcohol is glycerin. In another more preferred aspect, the alcohol is glycerol. In another more preferred aspect, the alcohol is 1,3-propanediol. In another more preferred aspect, the alcohol is sorbitol. In another more preferred aspect, the alcohol is xylitol. See, for example, Gong, C. S., Cao, N. J., Du, J., and Tsao, G. T., 1999, Ethanol production from renewable resources, in Advances in Biochemical Engineering/Biotechnology , Scheper, T., ed., Springer-Verlag Berlin Heidelberg, Germany, 65: 207-241; Silveira and Jonas, 2002, The biotechnological production of sorbitol, Appl. Microbiol. Biotechnol. 59: 400-408; Nigam and Singh, 1995, Processes for fermentative production of xylitol—a sugar substitute, Process Biochemistry 30(2): 117-124; Ezeji et al., 2003, Production of acetone, butanol and ethanol by Clostridium beijerinckii BA101 and in situ recovery by gas stripping, World Journal of Microbiology and Biotechnology 19(6): 595-603.
In another preferred aspect, the fermentation product is an alkane. The alkane can be an unbranched or a branched alkane. In another more preferred aspect, the alkane is pentane. In another more preferred aspect, the alkane is hexane. In another more preferred aspect, the alkane is heptane. In another more preferred aspect, the alkane is octane. In another more preferred aspect, the alkane is nonane. In another more preferred aspect, the alkane is decane. In another more preferred aspect, the alkane is undecane. In another more preferred aspect, the alkane is dodecane.
In another preferred aspect, the fermentation product is a cycloalkane. In another more preferred aspect, the cycloalkane is cyclopentane. In another more preferred aspect, the cycloalkane is cyclohexane. In another more preferred aspect, the cycloalkane is cycloheptane. In another more preferred aspect, the cycloalkane is cyclooctane.
In another preferred aspect, the fermentation product is an alkene. The alkene can be an unbranched or a branched alkene. In another more preferred aspect, the alkene is pentene. In another more preferred aspect, the alkene is hexene. In another more preferred aspect, the alkene is heptene. In another more preferred aspect, the alkene is octene.
In another preferred aspect, the fermentation product is an amino acid. In another more preferred aspect, the organic acid is aspartic acid. In another more preferred aspect, the amino acid is glutamic acid. In another more preferred aspect, the amino acid is glycine. In another more preferred aspect, the amino acid is lysine. In another more preferred aspect, the amino acid is serine. In another more preferred aspect, the amino acid is threonine. See, for example, Richard and Margaritis, 2004, Empirical modeling of batch fermentation kinetics for poly(glutamic acid) production and other microbial biopolymers, Biotechnology and Bioengineering 87(4): 501-515.
In another preferred aspect, the fermentation product is a gas. In another more preferred aspect, the gas is methane. In another more preferred aspect, the gas is H 2 . In another more preferred aspect, the gas is CO 2 . In another more preferred aspect, the gas is CO. See, for example, Kataoka et al., 1997, Studies on hydrogen production by continuous culture system of hydrogen-producing anaerobic bacteria, Water Science and Technology 36(6-7): 41-47; and Gunaseelan, 1997, Anaerobic digestion of biomass for methane production: A review, Biomass and Bioenergy 13(1-2): 83-114.
In another preferred aspect, the fermentation product is isoprene.
In another preferred aspect, the fermentation product is a ketone. It will be understood that the term “ketone” encompasses a substance that contains one or more ketone moieties. In another more preferred aspect, the ketone is acetone. See, for example, Qureshi and Blaschek, 2003, supra.
In another preferred aspect, the fermentation product is an organic acid. In another more preferred aspect, the organic acid is acetic acid. In another more preferred aspect, the organic acid is acetonic acid. In another more preferred aspect, the organic acid is adipic acid. In another more preferred aspect, the organic acid is ascorbic acid. In another more preferred aspect, the organic acid is citric acid. In another more preferred aspect, the organic acid is 2,5-diketo-D-gluconic acid. In another more preferred aspect, the organic acid is formic acid. In another more preferred aspect, the organic acid is fumaric acid. In another more preferred aspect, the organic acid is glucaric acid. In another more preferred aspect, the organic acid is gluconic acid. In another more preferred aspect, the organic acid is glucuronic acid. In another more preferred aspect, the organic acid is glutaric acid. In another preferred aspect, the organic acid is 3-hydroxypropionic acid. In another more preferred aspect, the organic acid is itaconic acid. In another more preferred aspect, the organic acid is lactic acid. In another more preferred aspect, the organic acid is malic acid. In another more preferred aspect, the organic acid is malonic acid. In another more preferred aspect, the organic acid is oxalic acid. In another more preferred aspect, the organic acid is propionic acid. In another more preferred aspect, the organic acid is succinic acid. In another more preferred aspect, the organic acid is xylonic acid. See, for example, Chen and Lee, 1997, Membrane-mediated extractive fermentation for lactic acid production from cellulosic biomass, Appl. Biochem. Biotechnol. 63-65: 435-448.
In another preferred aspect, the fermentation product is polyketide.
Recovery.
The fermentation product(s) can be optionally recovered from the fermentation medium using any method known in the art including, but not limited to, chromatography, electrophoretic procedures, differential solubility, distillation, or extraction. For example, alcohol is separated from the fermented cellulosic material or xylan-containing material and purified by conventional methods of distillation. Ethanol with a purity of up to about 96 vol. % can be obtained, which can be used as, for example, fuel ethanol, drinking ethanol, i.e., potable neutral spirits, or industrial ethanol.
Signal Peptide
The present invention also relates to an isolated polynucleotide encoding a signal peptide comprising or consisting of amino acids 1 to 17 of SEQ ID NO: 2, amino acids 1 to 20 of SEQ ID NO: 4, amino acids 1 to 20 of SEQ ID NO: 6, amino acids 1 to 19 of SEQ ID NO: 8, or amino acids 1 to 19 of SEQ ID NO: 10. The polynucleotide may further comprise a gene encoding a protein, which is operably linked to the signal peptide. The protein is preferably foreign to the signal peptide. In one aspect, the polynucleotide encoding the signal peptide is nucleotides 1 to 51 of SEQ ID NO: 1. In another aspect, the polynucleotide encoding the signal peptide is nucleotides 1 to 60 of SEQ ID NO: 3. In another aspect, the polynucleotide encoding the signal peptide is nucleotides 1 to 60 of SEQ ID NO: 5. In another aspect, the polynucleotide encoding the signal peptide is nucleotides 1 to 57 of SEQ ID NO: 7. In another aspect, the polynucleotide encoding the signal peptide is nucleotides 1 to 57 of SEQ ID NO: 9.
The present invention also relates to nucleic acid constructs, expression vectors and recombinant host cells comprising such polynucleotides.
The present invention also relates to methods of producing a protein, comprising (a) cultivating a recombinant host cell comprising such polynucleotide; and (b) recovering the protein.
The protein may be native or heterologous to a host cell. The term “protein” is not meant herein to refer to a specific length of the encoded product and, therefore, encompasses peptides, oligopeptides, and polypeptides. The term “protein” also encompasses two or more polypeptides combined to form the encoded product. The proteins also include hybrid polypeptides and fused polypeptides.
Preferably, the protein is a hormone, enzyme, receptor or portion thereof, antibody or portion thereof, or reporter. For example, the protein may be a hydrolase, isomerase, ligase, lyase, oxidoreductase, or transferase, e.g., an aminopeptidase, amylase, carbohydrase, carboxypeptidase, catalase, cellobiohydrolase, cellulase, chitinase, cutinase, cyclodextrin glycosyltransferase, deoxyribonuclease, endoglucanase, esterase, alpha-galactosidase, beta-galactosidase, glucoamylase, alpha-glucosidase, beta-glucosidase, invertase, laccase, lipase, mannosidase, mutanase, oxidase, pectinolytic enzyme, peroxidase, phytase, polyphenoloxidase, proteolytic enzyme, ribonuclease, transglutaminase, xylanase, or beta-xylosidase.
The gene may be obtained from any prokaryotic, eukaryotic, or other source.
The invention described and claimed herein is not to be limited in scope by the specific aspects herein disclosed, since these aspects are intended as illustrations of several aspects of the invention. Any equivalent aspects are intended to be within the scope of this invention. Indeed, various modifications of the invention in addition to those shown and described herein will become apparent to those skilled in the art from the foregoing description. Such modifications are also intended to fall within the scope of the appended claims. In the case of conflict, the present disclosure including definitions will control.