GH61 glycoside hydrolase protein variants and cofactors that enhance GH61 activity
First Claim
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1. A glycoside hydrolase 61 (GH61) variant protein comprising an amino acid sequence that is at least at least 90%, identical to SEQ ID NO:
- 2 or a fragment of SEQ ID NO;
2 having GH61 activity, wherein the amino acid sequence of the variant protein has one or more amino acid substitutions with respect to SEQ ID NO;
2 or said fragment.
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Abstract
The present invention provides various GH61 protein variants comprising various amino acid substitutions. The GH61 protein variants have an improved ability to synergize with cellulase enzymes, thereby increasing the yield of fermentable sugars obtained by saccharification of biomass. In some embodiments, sugars obtained from saccharification are fermented to produce numerous end-products, including but not limited to alcohol.
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Citations
23 Claims
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1. A glycoside hydrolase 61 (GH61) variant protein comprising an amino acid sequence that is at least at least 90%, identical to SEQ ID NO:
- 2 or a fragment of SEQ ID NO;
2 having GH61 activity, wherein the amino acid sequence of the variant protein has one or more amino acid substitutions with respect to SEQ ID NO;
2 or said fragment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22)
- 2 or a fragment of SEQ ID NO;
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15. A GH61 variant protein comprising an amino acid sequence that is at least 90% identical to SEQ ID NO:
- 5, or a fragment of SEQ ID NO;
5, having GH61 activity, wherein the amino acid sequence of the variant protein has one or more amino acid substitutions with respect to SEQ ID NO;
2 or said fragment, and wherein the substitution(s) in the amino acid sequence result in the variant protein having increased GH61 activity in a reaction where crystalline cellulose undergoes saccharification by cellulase enzymes that are contained in culture broth from M. thermophile cells, compared with a reference protein comprising SEQ ID NO;
2, or said fragment, without any of said substitutions.
- 5, or a fragment of SEQ ID NO;
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23. A GH61 variant protein encoded by a polynucleotide, wherein the protein comprises an amino acid sequence that is at least or about 85% identical to any of SEQ ID NO:
- 5, or a fragment of SEQ ID NO;
5, having GH61 activity, wherein the amino acid sequence of the variant protein has one or more amino acid substitutions with respect to SEQ ID NO;
2, or said fragment, and wherein the polynucleotide encoding the GH61 variant protein comprises at least one mutation set comprising t60c/c573g, wherein the nucleotide positions are numbered with reference to SEQ ID NO;
1.
- 5, or a fragment of SEQ ID NO;
Specification