Abstract
A new strain, Enterobacter sp. ECU1107, was identified among over 200 soil isolates using a two-step screening strategy for the enantioselective synthesis of (2S,3R)-3-phenylglycidate methyl ester (PGM), a key intermediate for production of a potent anticancer drug Taxol®. An organic–aqueous biphasic system was employed to reduce spontaneous hydrolysis of the substrate PGM and isooctane was found to be the most suitable organic solvent. The temperature and pH optima of the whole cell-mediated bioreaction were 40 °C and 6.0, respectively. Under these reaction conditions, the enantiomeric excess (ee s) of (2S,3R)-PGM recovered was greater than 99 % at approximately 50 % conversion. The total substrate loading in batch reaction could reach 600 mM. By using whole cells of Enterobacter sp. ECU1107, (2S,3R)-PGM was successfully prepared in decagram scale in a 1.0-l mechanically stirred reactor, affording the chiral epoxy ester in >99 % ee s and 43.5 % molar yield based on the initial load of racemic substrate.
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Acknowledgments
This research was financially supported by the National Natural Science Foundation of China (grant nos. 20902023 and 21276082), Ministry of Science and Technology (nos. 2011CB710800 and 2009ZX09501-016), and Fundamental Research Funds for the Central Universities from the Ministry of Education, China (no. 20090074120014).
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Zhou, DJ., Pan, J., Yu, HL. et al. Target-oriented discovery of a new esterase-producing strain Enterobacter sp. ECU1107 for whole cell-catalyzed production of (2S,3R)-3-phenylglycidate as a chiral synthon of Taxol. Appl Microbiol Biotechnol 97, 6293–6300 (2013). https://doi.org/10.1007/s00253-012-4435-z
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DOI: https://doi.org/10.1007/s00253-012-4435-z