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• W1987642133 abstract "Mandelate racemase (MR) is a promising candidate for the dynamic kinetic resolution of racemates. However, the poor activity of MR towards most of its non-natural substrates limits its widespread application. In this work, a virtual screening method based on the binding energy in the transition state was established to assist in the screening of MR mutants with enhanced catalytic efficiency. Using R-3-chloromandelic acid as a model substrate, a total of 53 mutants were constructed based on rational design in the two rounds of screening. The number of mutants for experimental validation was brought down to 17 by the virtual screening method, among which 14 variants turned out to possess improved catalytic efficiency. The variant V26I/Y54V showed 5.2-fold higher catalytic efficiency (kcat/Km) towards R-3-chloromandelic acid than that observed for the wild-type enzyme. Using this strategy, mutants were successfully obtained for two other substrates, R-mandelamide and R-2-naphthylglycolate (V26I and V29L, respectively), both with a 2-fold improvement in catalytic efficiency. These results demonstrated that this method could effectively predict the trend of mutational effects on catalysis. Analysis from the energetic and structural assays indicated that the enhanced interactions between the active sites and the substrate in the transition state led to improved catalytic efficiency. It was concluded that this virtual screening method based on the binding energy in the transition state was beneficial in enzyme rational redesign and helped to better understand the catalytic properties of the enzyme." @default.
• W1987642133 created "2016-06-24" @default.
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• W1987642133 date "2014-02-01" @default.
• W1987642133 modified "2023-10-14" @default.
• W1987642133 title "Virtual screening of mandelate racemase mutants with enhanced activity based on binding energy in the transition state" @default.
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• W1987642133 doi "https://doi.org/10.1016/j.enzmictec.2013.10.008" @default.
• W1987642133 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24411454" @default.
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