3.2.1.25 D199A low activity 680752 3.2.1.25 D206N catalytically active mutant enzyme, similar temperature optimum like wild-type enzyme. The high-catalytic turn-over rate by D206N for beta-glucosidase activity makes it a useful enzyme in cellulose degradation at high temperatures 750443 3.2.1.25 D206N in contrast to the wild-type enzyme which shows a catalytic efficiency for 4-nitrophenyl beta-D-mannopyranoside that is 5fold higher than that for 4-nitrophenyl beta-D-galactopyranoside and 4fold higher than that for 4-nitrophenyl beta-D-glucopyranoside, the mutant enzyme shows highest catalytic efficiency towards 4-nitrophenyl beta-D-glucopyranoside, 11fold higher than that for 4-nitrophenyl beta-D-galactopyranoside and 60fold higher than that for 4-nitrophenyl beta-D-mannopyranoside -, 654641 3.2.1.25 D206Q mutant enzyme shows less than 10% hydrolytic activity than the wild-type toward 4-nitrophenyl glycosides 750443 3.2.1.25 E206G complete loss of activity 695664 3.2.1.25 E207S no hydrolytic activity 750443 3.2.1.25 E314G complete loss of activity 695664 3.2.1.25 E330A mutant enzyme displays no activity against mannan or 4-nitrophenyl-beta-mannopyranoside 665524 3.2.1.25 E399S no hydrolytic activity 750443 3.2.1.25 E462A low activity 680752