Abstract
In this study, a high (R)-enantioselective nitrilase gene from Sphingomonas wittichii RW1 was cloned and overexpressed in Escherichia coli BL21 (DE3). The recombinant nitrilase was purified to homogeneity with a molecular weight of 40 kDa. The pH and temperature optima were shown to be pH 8.0 and 40 °C, respectively. The purified nitrilase was most active toward succinonitrile, approximately 30-fold higher than that for phenylglycinonitrile. Using the E. coli BL21/ReSWRW1 whole cells as biocatalysts, the kinetic resolution for asymmetric synthesis of (R)-phenylglycine was investigated at pH 6.0. A yield of 46 % was obtained with 95 % enantiomeric excess (ee), which made it a promising biocatalyst for synthesis of (R)-phenylglycine.
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This work was supported by the National Basic Research Program of China (No. 2012CB721003) and the Fundamental Research Funds for the Central Universities.
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Qiu, J., Su, EZ., Wang, HL. et al. Cloning, Overexpression, and Characterization of a High Enantioselective Nitrilase from Sphingomonas wittichii RW1 for Asymmetric Synthesis of (R)-Phenylglycine. Appl Biochem Biotechnol 173, 365–377 (2014). https://doi.org/10.1007/s12010-014-0845-y
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DOI: https://doi.org/10.1007/s12010-014-0845-y