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Chemcial Industry and Engineering 2014, Vol. 31 Issue (6) :75-79    DOI: doi: 10.13353/j.issn.1004.9533.2014.06.014
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Fusion Expression of Human Trypsin-1 with DsbA in E. coli
ZHANG  Wen-Yong1, WANG  Da-Mei1,2, GAN  Yi-Ru1, HUANG  He1
1Key Laboratory of System Bioengineering of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; 2Gan & Lee Pharmaceutical Co. Ltd., Beijing 100026, China

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Abstract The trypsin obtained from animal sources may contain infectious agents, currently it is in urgent need of production of recombinant trypsin. According to the codon usage frequency table, the bases of human trypsin-1 were changed by degenerate codon, and then the sequences were fused with the DsbA fragment C-terminal in the vector pET-39b(+). The cloned E. coli with recombinant vector achieved expression. Recombinant proteins mainly existed in the form of inclusion bodies, accounting for about 40% of the total bacteria proteins. By washing the pellet proteins, denaturation, renaturation and thrombin activation, we got 1.6 mg activated trypsin per liter fermented liquid with the commercial porcine trypsin as a standard, and achieved efficient human trypsin expression in prokaryotes.
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ZHANG Wen-Yong
WANG Da-Mei
GAN Yi-Ru
HUANG He
Keywordshuman trypsin-1;   inclusion bodies;   DsbA     
Received 2013-04-02;
Fund:

国家自然科学基金赞助项目(31470967);国家科技重大专项资助项目(2011ZX09201-301-05和2014ZX09508006-002-002)。

Corresponding Authors: 黄鹤,电话:(022)27409598,E-mail: huang@tju.edu.cn。     Email: huang@tju.edu.cn
About author: 张文勇(1988-),男,现从事生物化工方面的研究。
Cite this article:   
ZHANG Wen-Yong, WANG Da-Mei, GAN Yi-Ru, HUANG He.Fusion Expression of Human Trypsin-1 with DsbA in E. coli[J]  Chemcial Industry and Engineering, 2014,V31(6): 75-79
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