Significant expression of a Chinese scorpion peptide, BmK1, in Escherichia coli through promoter engineering and gene dosage strategy

Abstract

Heterologous expression is an efficient alternative to conventional extraction to produce a specific Buthus martensii Karsch (BmK) peptide. In this work, BmK1 was successfully expressed in Escherichia coli after genetic codon optimization, but BmK1 content was <6% of total cellular protein. To improve BmK1 expression, a trc promoter library with a wide relative strength was constructed, and three promoters, PpJF136 (0.55), PpJF325 (1.29), and PpJF288 (2.31), were selected to control BmK1 expression. A higher BmK1 expression (>13.9% of total protein) was obtained using a stronger promoter, PpJF325 . Furthermore, a maximum BmK1 content (>21.7% of total protein) was obtained by combining promoter PpJF325 and three copies of the BmK1 gene. The yield of the purified BmK1 achieved 196.74 mg L(-1) in E. coli BL21(DE3) pJF431, which was improved 2.09-fold compared with the control. This was the highest reported production of scorpion peptides in E. coli.

DOI: 10.1002/bab.1194

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@inproceedings{Wang2014SignificantEO, title={Significant expression of a Chinese scorpion peptide, BmK1, in Escherichia coli through promoter engineering and gene dosage strategy}, author={Jianfeng Wang and Zhiqiang Xiong and Yingying Yang and Na Zhao and Yong Wang}, booktitle={Biotechnology and applied biochemistry}, year={2014} }