1.20.1.1 D13E/M26I/E332N/C336D mutant obtained by directed evolution, round 3 673144 1.20.1.1 D13E/M26I/V71I/E130K/Q132R/Q137R/I150F/E175A/Q215L/R275Q/L276Q/I313L/V315A/A319E/A325V/E332N/C336D thermostable mutant TS-PTDH which contains 12 mutations that result in considerably increased thermostability with minimal change in activity, and four additional mutations that increase its activity. Mutation E175A leads to relaxation of cofactor specificity 726982 1.20.1.1 D79A significant differences in its kinetic constants compared to the wild-type enzyme. 2600fold decrease in catalytic efficiency. Pre-steady-state rates are approximately the same as the steady-state rates -, 690884 1.20.1.1 D79N has kinetic parameters more similar to those of wild-type 690884 1.20.1.1 E130K increases the half-life of thermal inactivation at 45°C from around 1 min to 12.5 min 691424 1.20.1.1 E130Q increases the half-life of thermal inactivation at 45°C from around 1 min to 7 min 691424 1.20.1.1 E130R increases the half-life of thermal inactivation at 45°C from around 1 min to 9 min 691424 1.20.1.1 E175A increases solubility and activity, thermostability almost identical to that of the wild-type enzyme 691424 1.20.1.1 E175A mutant with significantly increased kcat value for NADP+ 673144 1.20.1.1 E175A strongly decreased Km for NADP+ 657956