Abstract
In order to produce enantiomerically pure epoxides for the synthesis of value-added chemicals, a novel putative epoxide hydrolase (EH) sgeh was cloned and overexpressed in pET28a/Escherichia coli BL21(DE3). The 1047 bp sgeh gene was mined from Streptomyces griseus NBRC 13350 genome sequence. The recombinant hexahistidyl-tagged SGEH was purified (16.6-fold) by immobilized metal-affinity chromatography, with 90% yield as a homodimer of 100 kDa. The recombinant E. coli whole cells overexpressing SGEH could kinetically resolve racemic phenyl glycidyl ether (PGE) into (R)-PGE with 98% ee, 40% yield, and enantiomeric ratio (E) of 20. This was achieved under the optimized reaction conditions i.e. cell/substrate ratio of 20:1 (w/w) at pH 7.5 and 20 °C in 10% (v/v) dimethylformamide (DMF) in a 10 h reaction. 99% enantiopure (R)-PGE was obtained when the reaction time was prolonged to 12 h with a yield of 34%. In conclusion, an economically viable and environment friendly green process for the production of enantiopure (R)-PGE was developed by using wet cells of E. coli expressing recombinant SGEH.
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Acknowledgements
Streptomyces griseus NBRC 13350 was a gift from Prof. Yasuo Ohnishi, The University of Tokyo, JAPAN. This work was financially supported by Department of Biotechnology (DBT) via Grant No. BT/PR/4694/PID/6/633/2012, Government of India, New Delhi. Authors PS and NK gratefully acknowledge DBT for the SRF and JRF, respectively. The financial assistance received from Department of Science and Technology-Promotion of University Research and Scientific Excellence (DST-PURSE) and University Grants Commission-Special Assistance Programme (UGC-SAP) (DRS Phase-I) is duly acknowledged. The author SIW (UGC-SAP Project fellow) acknowledges fellowship received under this scheme.
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Saini, P., Kumar, N., Wani, S.I. et al. Bioresolution of racemic phenyl glycidyl ether by a putative recombinant epoxide hydrolase from Streptomyces griseus NBRC 13350. World J Microbiol Biotechnol 33, 82 (2017). https://doi.org/10.1007/s11274-017-2248-z
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DOI: https://doi.org/10.1007/s11274-017-2248-z