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Purification and bio-chemical characterization of a solvent-tolerant and highly thermostable lipase of Bacillus licheniformis strain SCD11501

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Proceedings of the National Academy of Sciences, India Section B: Biological Sciences Aims and scope Submit manuscript

Abstract

The lipase of Bacillus licheniformis SCD11501 was purified with a fold purification of 10.6 and a yield of 8.4 % by ion-exchange chromatography on a DEAE-cellulose column. The purified enzyme was found to be electrophoretically pure by denaturing SDS-PAGE and possessed a Mr of approximately 35 kDa. A single band ~70 kDa was observed in native-PAGE confirming that the lipase of B. licheniformis appeared to be a holozyme that comprises two identical subunits of ~35 kDa in SDS-PAGE. Thus the lipase appeared to be a homodimeric protein which was an interesting observation. The purified lipase was optimally active at 55 °C and pH 9.5 and showed maximum hydrolytic activity towards a relatively longer C-chain length p-NPP substrate. The lipase was stimulated only in the presence of Fe2+ while the presence of the chelating agent(s) inhibited its activity. All surfactants (Triton X-100, Tween 20, Tween 40, Tween 60, Tween 80 and SDS) had an inhibitory effect on lipase activity. The purified lipase also retained good activity in the presence of both hydrophobic (n-hexane) as well as hydrophilic (DMSO) solvents that indicated its usefulness in promoting both hydrolytic as well as synthetic reactions. The extracellular lipase was highly thermostable as it showed a half-life of 150 min at 55 °C and 60 min at 75 °C. The K m and V max of purified lipase of B. licheniformis SCD11501 was found to be 0.43 mM and 2.27 µmol/ml/min, respectively for hydrolysis of p-NPP.

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Acknowledgments

This work is financially supported by an annual grant sanctioned by Department of Biotechnology, Ministry of Science and Technology, Government of India to Department of Biotechnology, Himachal Pradesh University, Shimla, India. Further, the authors have no conflict of interest among themselves or with the parent institution.

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Correspondence to Shivika Sharma.

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Sharma, S., Kanwar, S.S. Purification and bio-chemical characterization of a solvent-tolerant and highly thermostable lipase of Bacillus licheniformis strain SCD11501. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 87, 411–419 (2017). https://doi.org/10.1007/s40011-015-0612-z

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  • DOI: https://doi.org/10.1007/s40011-015-0612-z

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