Isolation of a novel strain, Sphingorhabdus sp. YGSMI21 and characterization of its enantioselective epoxide hydrolase activity

Abstract

Sphingorhabdus sp. YGSMI21, a novel microbial strain with an enantioselective epoxide hydrolase activity, was isolated from tidal samples contaminated by accidental oil spills subjected to enriched culture with polycyclic aromatic hydrocarbon. This strain was able to optically decompose (R)-styrene oxide (SO) and showed 100% optical purity. In addition, it showed a good enantioselectivity for the derivatives of (S)-SO, (S)-2-chlorostyrene oxide (CSO), (S)-3-CSO and (S)-4-CSO. For (S)-2-CSO, (S)-3-CSO and (S)-4-CSO, 99.9%ee was obtained with the yield of 26.2%, 24.8%, and 11.0%, respectively, when using 10 mg cells of Sphingorhabdus sp. YGSMI21 at pH 8.0 with 4 mM racemic substrates at pH 8.0 and 25°C. The values obtained in this study for (S)-2-CSO, particularly the yield of 26.2%, is noteworthy, considering that obtaining an enantiomerically pure form is difficult. Taken together, Sphingorhabdus sp. YGSMI21 can be regarded as a whole-cell biocatalyst in the production of various (S)-CSO with the chlorine group at a different position.

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Acknowledgements

This work supported by Gyeongsangbuk-do R&D Program (to JHW) and the grants provided from the National Research Foundation of Korea and (2018R1D1A1A02086230; to HYS).

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Correspondence to Jung-Hee Woo or Ho Young Suk.

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Woo, JH., Kim, HS., Park, NH. et al. Isolation of a novel strain, Sphingorhabdus sp. YGSMI21 and characterization of its enantioselective epoxide hydrolase activity. J Microbiol. 59, 675–680 (2021). https://doi.org/10.1007/s12275-021-1023-x

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Keywords

  • enantioselective
  • epoxide hydrolase
  • styrene oxide
  • chlorostyrene oxide
  • Sphingorhabdus sp. YGSMI21