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Zheng Y, Luo W, Yang J, Wang H, Hu Q, Zeng Z, Li X, Wang S. Controlled co-immobilisation of proteins via 4'-phosphopantetheine-mediated site-selective covalent linkage. N Biotechnol 2022; 72:114-121. [PMID: 36307012 DOI: 10.1016/j.nbt.2022.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 07/12/2022] [Accepted: 10/22/2022] [Indexed: 11/05/2022]
Abstract
In Escherichia coli, acyl carrier protein (ACP) is posttranslationally converted into its active holo-ACP form via covalent linkage of 4'-phosphopantetheine (4'-PP) to residue serine-36. We found that the long flexible 4'-PP arm could react chemoselectively with the iodoacetyl group introduced on solid supports with high efficiency under mild conditions. Based on this finding, we developed site-selective immobilisation of proteins via the active holo-ACP fusion tag, independently of the physicochemical properties of the protein of interest. Furthermore, the molecular ratios of co-immobilised proteins can be manipulated because the tethering process is predominantly directed by the molar concentrations of diverse holo-ACP fusions during co-immobilisation. Conveniently tuning the molecular ratios of co-immobilised proteins allows their cooperation, leading to a highly productive multi-protein co-immobilisation system. Kinetic studies of enzymes demonstrated that α-amylase (Amy) and methyl parathion hydrolase (MPH) immobilised via active tag holo-ACP had higher catalytic efficiency (kcat/Km) in comparison with their corresponding counterparts immobilised via the sulfhydryl groups (-SH) of these proteins. The immobilised holo-ACP-Amy also presented higher thermostability compared with free Amy. The enhanced α-amylase thermostability upon immobilisation via holo-ACP renders it more suitable for industrial application.
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Affiliation(s)
- Yujiao Zheng
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 541642, PR China; College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, PR China
| | - Wenshi Luo
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 541642, PR China; College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, PR China
| | - Jia Yang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 541642, PR China; College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, PR China
| | - Huazhen Wang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 541642, PR China; College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, PR China
| | - Quan Hu
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 541642, PR China; College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, PR China
| | - Zaohai Zeng
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 541642, PR China; College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, PR China
| | - Xuefeng Li
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 541642, PR China; College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, PR China
| | - Shengbin Wang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, Guangzhou 541642, PR China; College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong, PR China.
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