Directed evolution of a carbonyl reductase LsCR for the enantioselective synthesis of (1S)-2-chloro-1-(3,4-difluorophenyl) ethanol

化学 定向进化 对映选择合成 突变体 催化作用 酶动力学 饱和突变 基质(水族馆) 生物催化 乙醇 活动站点 立体化学 组合化学 生物化学 反应机理 地质学 海洋学 基因
作者
Hua‐Tao Liu,Chun‐Yue Weng,Shenyuan Xu,Shufang Li,Yajun Wang,Yu‐Guo Zheng
出处
期刊:Bioorganic Chemistry [Elsevier]
卷期号:127: 105991-105991 被引量:8
标识
DOI:10.1016/j.bioorg.2022.105991
摘要

Traditional screening methods of enzyme engineering often require building large mutant libraries to screen for potentially beneficial sites, which are often time-consuming and labor-intensive with low mining efficiency. In this study, a novel enzyme engineering strategy was established to modify carbonyl reductase LsCR for the synthesis of (1S)-2-chloro-1-(3,4-difluorophenyl) ethanol ((S)-CFPL), which is a key intermediate of anticoagulant drug ticagrelor. The strategy was developed by combining HotSpot, FireProt and multiple sequence alignment, resulting in the construction of a "small and smart" mutant library including 10 mutations. Among them, 5 mutations were positive, resulting in a 50% mining accuracy of beneficial sites. Finally, a highly active mutant LsCRM3 (N101D/A117G/F147L) was obtained by further screening through saturation mutation and iterative mutation. Compared with wild type (WT) LsCR, the catalytic activity of LsCRM3 was increased by 4.7 times, the catalytic efficiency kcat/KM value was increased by 2.9 times, and the half-life t1/2 at 40 °C was increased by 1.3 times. Due to the low aqueous solubility of the substrate 2-chloro-1-(3,4-difluorophenyl) ethanone (CFPO), isopropanol was used as not only the co-substrate but also co-solvent. In the presence of 40% (v/v) isopropanol, LsCRM3 completely reduced 400 g/L CFPO to enantiomerically pure CFPL (99.9%, e.e.) in 11 h with a space-time yield (STY) as high as 809 g/L∙d.
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