Single mutations of ketoreductase ChKRED20 enhance the bioreductive production of (1S)-2-chloro-1-(3, 4-difluorophenyl) ethanol
| Autor: | Zhong-Liu Wu, Xiao-Qiong Pei, Chao Guo, Yan Liu, Feng-Jiao Zhao |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Ticagrelor Adenosine Ketone Stereochemistry Mutant Applied Microbiology and Biotechnology Substrate Specificity 2-Propanol 03 medical and health sciences Saturated mutagenesis Gene Library Chryseobacterium chemistry.chemical_classification Ethanol Substrate (chemistry) General Medicine Ketones NAD 030104 developmental biology Enantiopure drug chemistry Mutagenesis Yield (chemistry) Biocatalysis Specific activity Stereoselectivity Oxidoreductases Oxidation-Reduction Biotechnology |
| Zdroj: | Applied Microbiology and Biotechnology. 101:1945-1952 |
| ISSN: | 1432-0614 0175-7598 |
| Popis: | (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 k cat/K m increased 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 %. |
| Databáze: | OpenAIRE |
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