FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (7): 144-147.doi: 10.7506/spkx1002-6630-201307030

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Expression of Bile Salt Hydrolase Genes from Two Different Origins in Escherichia coli Rosetta

YANG Shi-qin1,MAN Chao-xin2,QU Xing-guang1,LI Bin1,XIE Kun-hao1,JIANG Yu-jun1,2,*   

  1. 1. Key Dairy Science Laboratory, Ministry of Education, Northeast Agricultural University, Harbin 150030, China; 2. National Dairy Engineering and Technical Research Center, Harbin 150086, China
  • Received:2011-12-26 Revised:2013-02-02 Online:2013-04-15 Published:2013-03-20
  • Contact: JIANG Yu-jun E-mail:yujun_jiang@163.com

Abstract: Bile salt hydrolase (BSH) gene of Bifidobacterium bifidum ATCC 29521 and Lactobacillus acidophilus NCFM was amplified by gradient PCR using genome DNA as template and cloned into pET28a (+) expression vector. The expression vector was then transfected into E. coli Rosetta and expression of BSH was induced by IPTG. SDS-PAGE analysis showed the presence of three target proteins estimated to be 40, 43 kD and 45 kD, respectively. Ninhydrin analysis revealed that the recombinant BSH hydrolyzed sodium glycocholate to glycine, showing its hydrolysis activity on conjugated bile salts.

Key words: bile salt hydrolase, cloning and expression, activity analysis

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