Abstract
Lipase (EC 3.1.1.3) is a popular enzyme used as an ingredient in detergents and biocatalyst in many biochemical reactions. Lipase is usually expressed in Escherichia coli as an inactive inclusion body and at a low level. In this study, Candida antarctica lipase B (CalB) was fused with various polycationic amino acid tags and expressed in E. coli in order to increase a soluble expression level. By induction with 1.0 mM IPTG, the authentic and fused CalBs were expressed at 27–56% of total protein. The 10-arginine and 10-lysine tags fused at the C-terminal of CalB significantly increased the solubility of CalB by five- to ninefold, relative to the case of the authentic CalB expressed in a recombinant E. coli Origami 2TM (DE3) strain. Among a series of the C-terminal poly-arginine tags, the recombinant CalB combined with the 10-arginine tag (CalB-R10) possessed the highest lipase specific activity of 9.5 ± 0.03 U/mg protein, corresponding to a fourfold enhancement compared with the authentic CalB.
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Acknowledgments
This research was supported by Basic Science Research Program (2010-0015928) through the National Research Foundation of Korea (NRF), and the Advanced Biomass R&D Center (ABC) of Korea Grant (2010-0029799) funded by the Ministry of Education, Science and Technology, and in part by the new faculty research program 2009 of Kookmin University in Korea.
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Jung, HJ., Kim, SK., Min, WK. et al. Polycationic amino acid tags enhance soluble expression of Candida antarctica lipase B in recombinant Escherichia coli . Bioprocess Biosyst Eng 34, 833–839 (2011). https://doi.org/10.1007/s00449-011-0533-z
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DOI: https://doi.org/10.1007/s00449-011-0533-z