Soluble Prokaryotic Expression, Fermentation Optimization<b> </b>and Purification of Recombinant Human DCD-1L

Wenjun MA; Xiaoyan GUO; Lin TENG; Peipei WANG; Hongyuan WEI; Chunyang ZHENG

doi:10.13386/j.issn1002-0306.2020080008

Volume 42 Issue 9

Apr. 2021

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Science and Technology of Food Industry > 2021 > 42(9): 114-121. > DOI: 10.13386/j.issn1002-0306.2020080008

MA Wenjun, GUO Xiaoyan, TENG Lin, et al. Soluble Prokaryotic Expression, Fermentation Optimization and Purification of Recombinant Human DCD-1L[J]. Science and Technology of Food Industry, 2021, 42(9): 114−121. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2020080008.

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Soluble Prokaryotic Expression, Fermentation Optimization and Purification of Recombinant Human DCD-1L

1.
Tianjin University, Tianjin 300350, China
2.
Robustnique Corporation Ltd., Tianjin 300384, China
3.
Staidson (Beijing) Biopharmaceuticals Co., Ltd. ,Beijing 101100, China
4.
Integribiotech Corporation Ltd., Tianjin 300384, China

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Received Date: August 02, 2020
Available Online: February 24, 2021

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Abstract

Abstract

Objective: The study aimed to realize the prokaryotic soluble expression of human sweat gland antibiotic DCD-1L, optimize its fermentation and purification conditions, and analyze its antibacterial properties. Methods: Firstly, the sequence of human DCD-1L was identified by searching NCBI, and the vector pET28a-DCD-1L was constructed. After transformed into E. coli ER2566, it was induced by IPTG and identified by SDS-PAGE. Secondly, through single factor experiment, the fermentation conditions of different temperature, rotation and feeding speed were studied and optimized to determine the optimal fermentation conditions for DCD-1L. Thirdly, according to the properties of the protein, a complete purification process was established, including ultrafiltration, Q-column elution and molecular sieve. Results: The optimal fermentation conditions of DCD-1L were obtained: 37 ℃, 400 r/min, and the peristaltic pump was 50 mL/30 min. The purity of DCD-1L was more than 96%, and the total recovery rate was 18.4%. The purified recombinant human DCD-1L had more significant antibacterial activity against Gram-positive bacteria such as Staphylococcus epidermidis than Escherichia coli. Conclusion: The recombinant human DCD-1L protein is expressed in prokaryotic cells, and the fermentation and purification processes is stable and reliable, which lays a foundation for the industrial production of recombinant human DCD-1L protein.

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