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Recombinant Expression and Detection of Antimicrobial Activity of Cec4a |
CHEN Su-fang1,XIA Ming-yin1,ZENG Li-yan1,AN Xiao-qin1,TIAN Min-fang1,PENG Jian1,2,**() |
1 School of Biology and Medical Engineering/Basic Medical College,Guizhou Medical University,Guiyang 550025,China 2 Key Laboratory of Environmental Pollution and Disease Control of Ministry of Education, Guiyang 550025,China |
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Abstract Objective: To construct the recombinant expression system of Cec4a, and to obtain the recombinant protein by induced expression and detect the antibacterial activity of the product. Methods: Based on the primers designed according to the sequence of Cec4a, the mature peptide part of Cec4a gene was amplified by PCR. Recombinant prokaryotic expression plasmid was constructed using prokaryotic expression vector (pCold-SUMO) and transformed into E. coli C41 (DE3) competent cells, which were induced by IPTG. His-SUMO labeled recombinant Cec4a fusion protein was purified by Ni-NTA affinity chromatography. The target protein was purified by Ni-NTA affinity chromatography after SUMO protease digestion. Acinetobacter baumannii (ATCC19606) was used to detect the antibacterial activity of the product. Results: pCold-SUMO-Cec4a prokaryotic expression plasmid was successfully constructed, and the sequencing analysis was consistent with the expected results. The expression level of Cec4a fusion protein was 42.8mg/L, and the MIC of purified Cec4a recombinant protein against Acinetobacter baumannii was 4 μg/mL. Conclusion: The recombinant Cec4a protein with antibacterial activity was successfully constructed and purified by Ni-NTA affinity chromatography. It lays a foundation for further study on the biological activity, the relationship between the structure and function of Cec4a.
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Received: 25 May 2021
Published: 08 November 2021
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Corresponding Authors:
Jian PENG
E-mail: pjf66666@126.com
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