Single mutations of ketoreductase ChKRED20 enhance the bioreductive production of (1S)-2-chloro-1-(3, 4-difluorophenyl) ethanol.
(1S)-2-chloro-1-(3, 4-difluorophenyl) ethanol ((S)-CFPL) is an intermediate for the drug ticagrelor, and is manufactured via chemical approaches. To develop a biocatalytic solution to (S)-CFPL, an inventory of ketoreductases from Chryseobacterium sp. CA49 were rescreened, and ChKRED20 was found to catalyze the reduction of the ketone precursor with excellent stereoselectivity (>99 % ee). After screening an error-prone PCR library of the wild-type ChKRED20, two mutants, each bearing a single amino acid substitution of H145L or L205M, were identified with significantly increased activity. Then, the two critical positions were each randomized by constructing saturation mutagenesis libraries, which delivered several mutants with further enhanced activity. Among them, the mutant L205A was the best performer with a specific activity of 178 μmol/min/mg, ten times of that of the wild-type. Its kcat/Kmincreased by 15 times and half-life at 50 °C increased by 70 %. The mutant catalyzed the complete conversion of 150 and 200 g/l substrate within 6 and 20 h, respectively, to yield enantiopure (S)-CFPL with an isolated yield of 95 %.
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.|Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu, 610041, China.|Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China.
Feng-Jiao
FJ
Zhao
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.|Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu, 610041, China.|Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China.
Yan
Y
Liu
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.|Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu, 610041, China.|Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China.
Xiao-Qiong
XQ
Pei
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.|Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu, 610041, China.|Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China.
Chao
C
Guo
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China. wuzhl@cib.ac.cn.|Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu, 610041, China. wuzhl@cib.ac.cn.
Zhong-Liu
ZL
Wu
D019840:2-Propanol / Q000737:chemistry; D000241:Adenosine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D055162:Biocatalysis; D045247:Chryseobacterium / Q000201:enzymology* / Q000378:metabolism; D000431:Ethanol / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry; D015723:Gene Library; D007659:Ketones / Q000378:metabolism*; D016296:Mutagenesis; D009243:NAD / Q000737:chemistry; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism*; D013379:Substrate Specificity; D000077486:Ticagrelor
D007659:Ketones; D009243:NAD; D000431:Ethanol; D010088:Oxidoreductases; D000077486:Ticagrelor; D000241:Adenosine; D019840:2-Propanol
Bioreduction; Carbonyl reductase; Directed evolution; Ketoreductase; Ticagrelor