Coevolving stability and activity of LsCR by a single point mutation and constructing neat substrate bioreaction system.

Carbonyl reductase (CR)-catalyzed bioreduction in the organic phase and the neat substrate reaction system is a lasting challenge, placing higher requirements on the performance of enzymes. Protein engineering is an effective method to enhance the properties of enzymes for industrial applications. In the present work, a single point mutation E145A on our previously constructed CR mutant LsCR , coevolved thermostability, and activity. Compared with LsCR , the catalytic efficiency k /K of LsCR -E145A (LsCR ) was increased from 6.6 to 21.9 s  mM . Moreover, E145A prolonged the half-life t at 40°C from 4.1 to 117 h, was increased by 5°C, was increased by 14.6°C, and T was increased by 15°C. Only 1 g/L of lyophilized Escherichia coli cells expressing LsCR completely reduced up to 600 g/L 2-chloro-1-(3,4-difluorophenyl)ethanone (CFPO) within 13 h at 45°C, yielding the corresponding (1S)-2-chloro-1-(3,4-difluorophenyl)ethanol ((S)-CFPL) in 99.5% ee , with a space-time yield of 1.0 kg/L d, the substrate to catalyst ratios (S/C) of 600 g/g. Compared with LsCR , the substrate loading was increased by 50%, with the S/C increased by 14 times. Compared with LsCR , the substrate loading was increased by 6.5 times. In contrast, LsCR completely converted 600 g/L CFPO within 12 h in the neat substrate bioreaction system.