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Chemical modification with functionalized ionic liquids: a novel method to improve the enzymatic properties of Candida rugosa lipase

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Abstract

Chemical modification of lysine residues in Candida rugosa lipase (CRL) was carried out using five different functional ionic liquids, and about 15.4–25.0 % of the primary amino groups of lysine were modified. Enzymatic properties of the native and modified CRLs were investigated in olive oil hydrolysis reaction. Improved thermal stability, catalytic activity in organic solvents, and adaptability to temperature and pH changes were achieved compared with the native enzyme. CRL modified by [choline][H2PO4] showed the best results, bearing a maximum improvement of 16.7 % in terms of relative activity, 5.2-fold increase in thermostability (after incubation at 45 °C for 5 h), and 2.3-fold increase in activity in strong polar organic solvent (80 % dimethyl sulfoxide) compared with the native enzyme. The results of ultraviolet, circular dichroism and fluorescence spectroscopy suggested that the change of the secondary and tertiary structures of CRL caused by the chemical modification resulted in the enhancement of enzymatic performance. The modification of CRL with functional ionic liquids was proved to be a novel and efficient method for improving the enzymatic properties of CRL.

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Acknowledgments

This research was supported by the National Science Foundation for Distinguished Young Scholars of China (No. 21225626), the National Natural Science Foundation of China for Young Scholars (Grant No. 20906049), the National Basic Research Program of China (Grant No. 2011CB710800), the Hi-Tech Research and Development Program of China (863 Program, 2011AA02A209).

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Authors and Affiliations

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing, 210009, China

    Yi Hu, Jiao Yang, Ru Jia, Yan Ding, Shuang Li & He Huang

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  1. Yi Hu
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  2. Jiao Yang
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  3. Ru Jia
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  4. Yan Ding
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  5. Shuang Li
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  6. He Huang
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Correspondence to He Huang.

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Hu, Y., Yang, J., Jia, R. et al. Chemical modification with functionalized ionic liquids: a novel method to improve the enzymatic properties of Candida rugosa lipase. Bioprocess Biosyst Eng 37, 1617–1626 (2014). https://doi.org/10.1007/s00449-014-1134-4

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  • DOI: https://doi.org/10.1007/s00449-014-1134-4

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