1.2.1.89 guanidine-HCl the stability of the enzyme is ca. 28 kJ/mol both at 25°C and 40°C -, 726348 1.2.1.89 isobutanol the stability of the enzyme is ca. 28 kJ/mol both at 25°C and 40°C -, 726348 1.2.1.89 isobutanol wild-type, 50% residual activity at 3.1%, mutant F34M/S405N at 3.6%, mutant F34M/Y399C/S405N at 3.5%, respectively 736023