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Characterization of a novel halotolerant esterase from Chromohalobacter canadensis isolated from salt well mine

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Abstract

A esterase gene was characterized from a halophilic bacterium Chromohalobacter canadensis which was originally isolated from a salt well mine. Sequence analysis showed that the esterase, named as EstSHJ2, contained active site serine encompassed by a conserved pentapeptide motif (GSSMG). The EstSHJ2 was classified into a new lipase/esterase family by phylogenetic association analysis. Molecular weight of EstSHJ2 was 26 kDa and the preferred substrate was p-NP butyrate. The EstSHJ2 exhibited a maximum activity at 2.5 M NaCl concentration. Intriguingly, the optimum temperature, pH and stability of EstSHJ2 were related to NaCl concentration. At 2.5 M NaCl concentration, the optimum temperature and pH of EstSHJ2 were 65 ℃ and pH 9.0, and enzyme remained 81% active after 80 ℃ treatment for 2 h. Additionally, the EstSHJ2 showed strong tolerance to metal ions and organic solvents. Among these, 10 mM K+, Ca2+ , Mg2+ and 30% hexane, benzene, toluene has significantly improved activity of EstSHJ2. The EstSHJ2 was the first reported esterase from Chromohalobacter canadensis, and may carry considerable potential for industrial applications under extreme conditions.

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Acknowledgements

This research was supported by Liquor Making Biological Technology and Application of Key Laboratory of Sichuan Province (NJ2018-07).

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All authors contributed to the study conception and design. MW, LA, MPZ, and CW conceived and designed the experiments. MW, LA and MPZ performed the experiments and analyzed the data. MW, CW wrote the manuscript. CW and FQW critically revised manuscript.

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Correspondence to Chuan Wang.

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Wang, M., Ai, L., Zhang, M. et al. Characterization of a novel halotolerant esterase from Chromohalobacter canadensis isolated from salt well mine. 3 Biotech 10, 430 (2020). https://doi.org/10.1007/s13205-020-02420-0

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  • DOI: https://doi.org/10.1007/s13205-020-02420-0

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