Endoglucanase mutants and mutant hydrolytic depolymerizing enzymes and uses thereof
First Claim
1. A method for increasing the specific activity of a glycosyl hydrolase on a substrate, comprising replacing a hydrophobic surface binding amino acid of the hydrolase with a positively charged amino acid, to provide a mutant glycosyl hydrolase,
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Accused Products
Abstract
The invention provides a method for increasing the specific activity of a glycosyl hydrolase on a substrate, comprising replacing a hydrophobic surface binding amino acid of the hydrolase with a positively charged amino acid; and a method for increasing the specific activity of a glycosyl hydrolase on a substrate, comprising replacing an active site associated glycosyl-stabilizing amino acid of the hydrolase with an amino acid, the replacing amino acid not strongly retarding cellobiose from leaving the active site. The invention further provides mutant glycosyl hydrolases, which include Y245G, Y42R, and W82R.
5 Citations
26 Claims
- 1. A method for increasing the specific activity of a glycosyl hydrolase on a substrate, comprising replacing a hydrophobic surface binding amino acid of the hydrolase with a positively charged amino acid, to provide a mutant glycosyl hydrolase,
- 3. A method for increasing the specific activity of a glycosyl hydrolase on a substrate, comprising replacing an active site associated glycosyl-stabilizing amino acid of the hydrolase with an amino acid, the replacing amino acid not strongly retarding cellobiose from leaving the active site to provide a mutant glycosyl hydrolase.
- 9. A mutant glycosyl hydrolase having enhanced catalytic activity, said mutant glycosyl hydrolase comprising an amino having a positively charged amino acid at a position occupied by a hydrophobic surface binding amino acid in a wild-type glycosyl hydrolase amino acid sequence, wherein said mutant glycosyl hydrolase has an enhanced catalytic activity of 10% to 50% compared to catalytic activity of the wild-type glycosyl hydrolase.
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15. A method for converting a biomass into ethanol comprising:
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a. mixing a composition comprising biomass with a mutant glycosyl hydrolase having enhanced catalytic activity over a wild-type glycosyl hydrolase to provide a soluble fermentable sugar preparation; and
b. fermenting said soluble fermentable sugar preparation to provide a composition comprising ethanol. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method for converting a biomass to a lactic acid comprising:
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a. admixing a composition comprising a biomass with a glycosyl mutant hydrolase having enhanced catalytic activity over a wild-type glycosyl hydrolase to provide a soluble fermentable sugar preparation; and
b. fermenting said soluble fermentable sugar preparation to provide lactic acid. - View Dependent Claims (23, 24, 25)
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26. A method for increasing the specific activity of a hydrolytic depolymerizing enzyme, comprising replacing an extended-active site residue that binds strongly to the leaving group with another that binds much less strongly to the leaving group.
Specification