Abstract
Methyl (R)-o-chloromandelate (R-CMM) is an intermediate for the platelet aggregation inhibitor clopidogrel. Its preparation through enzymatic resolution of the corresponding ester has been hindered by the lack of an enzyme with satisfying enantioselectivity and activity. In the present work, we aimed to improve the enzymatic enantioselectivity towards methyl (S)-o-chloromandelate (S-CMM) by rational design, using esterase BioH as a model enzyme. Based on the differences in the binding mode of S- and R-enantiomers at the active cavity of the enzyme, the steric and electronic interactions between the key amino acids of BioH and the enantiomers were finely tuned. The enantioselectivity of esterase BioH towards S-CMM was improved from 3.3 (the wild type) to 73.4 (L123V/L181A/L207F). Synergistic interaction was observed between point mutations, and insight into the source of enzymatic enantioselectivity was gained by molecular dynamics simulations. The results can provide a reference for the enzyme design of other enzymes towards S-CMM for the enhancement of enantioselectivity.
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Acknowledgments
This work was financially supported by the Natural Science Foundation of China (Grant No. 21176215), the Program for Zhejiang Leading Team of S&T Innovation (Grant No. 2011R50007), the Fundamental Research Funds for the Central Universities (Grant No. 2014QNA4025), and Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ14B060005).
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ESM 1
Synthetic primers used for site-directed mutagenesis, geometry of the hydrogen bonds between the mutants and R- or S-CMM, the catalytic activities of the wild-type BioH and mutants towards S- and R-CMM, energy contribution (kcal/mol) of key amino acids at the active cavity for the designed mutants and the wild type in R-complex and S-complex, geometry of the hydrogen bonds formed between the R-CMM or S-CMM and residue H233 for mutants L207C and L207S are shown in the supporting information. (PDF 616 kb)
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Gu, J., Ye, L., Guo, F. et al. Rational design of esterase BioH with enhanced enantioselectivity towards methyl (S)-o-chloromandelate. Appl Microbiol Biotechnol 99, 1709–1718 (2015). https://doi.org/10.1007/s00253-014-5995-x
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DOI: https://doi.org/10.1007/s00253-014-5995-x