Abstract
Cephalosporin C acylase (CCA), an important industrial enzyme for the production of 7-aminocephalosporanic acid, has very limited and scattered surface lysine residues. A mutant of cephalosporin C acylase (mCCA) has been designed to fuse a poly-lysine tag to the C-terminal of the β-subunit, which is far away from the active site. The free mCCA showed a near equal specific activity with the wild-type CCA, while a much higher activity recovery was obtained for the mCCA than its wild-type counterpart after immobilization on glyoxyl agarose support (73.3 versus 53.3 %). The mCCA’s oriented immobilization enables it to obtain a higher substrate affinity and even a higher thermal stability than the wild-type enzyme. The improvement of stability might be attributed to the multipoint covalent attachment by the oriented enzyme immobilization via the adhered poly-lysine tag, which prevents the dissociation of the β-subunit of CCA from the support.
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Acknowledgments
This work was supported by the National Science Foundation of China (21276023; 21476025), Beijing Natural Science foundation (2143041), and the Fundamental Research Funds for the Central Universities of China (FRF-BR-11-002A; FRF-SD-12-007A). The authors thank North China Pharmaceutical Co., Ltd. for the generous supply of CPC and 7-ACA.
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Luo, H., Zhao, H., Chang, Y. et al. Oriented Immobilization and Characterization of a Poly-Lysine-Tagged Cephalosporin C Acylase on Glyoxyl Agarose Support. Appl Biochem Biotechnol 175, 2114–2123 (2015). https://doi.org/10.1007/s12010-014-1411-3
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DOI: https://doi.org/10.1007/s12010-014-1411-3