食品科学 ›› 2012, Vol. 33 ›› Issue (17): 165-168.

• 生物工程 • 上一篇    下一篇

植物乳杆菌ST-III胆盐水解酶的表达及其酶活分析

任 婧1,姚 晶1,2   

  1. 1.光明乳业研究院 乳业生物技术国家重点实验室 2.上海海洋大学食品学院
  • 收稿日期:2011-09-05 修回日期:2012-07-23 出版日期:2012-09-15 发布日期:2012-11-09
  • 通讯作者: 任婧 E-mail:renjing@brightdairy.com
  • 基金资助:

    乳品安全控制和新型乳品加工关键技术研究;上海乳业生物工程技术研究中心课题

Expression and Activity Analysis of Bile Salt Hydrolases from Lactobacillus plantarum ST-Ⅲ

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  • Received:2011-09-05 Revised:2012-07-23 Online:2012-09-15 Published:2012-11-09

摘要: 以植物乳杆菌(Lactobacillus plantarum)ST-Ⅲ 4种胆盐水解酶(BSHs)的编码序列(bsh 1~4),将其克隆至表达载体pET-28b(+)上,在原核系统进行表达,并对其酶活力进行测定,结果发现4种BSHs的酶活力分别为29.00、20.49、24.90、21.13U/mL。同时BSH1比其他3种BSHs表现出更高的水解能力。

关键词: 植物乳杆菌, 胆盐水解酶, 表达, 酶活力

Abstract: In vertebrates, bile salt hydrolysis plays an essential role in fat metabolism. Bile salts are synthesized in the liver. In the small intestine, glycine or taurine are de-conjugated from bile salts by the enzyme bile salt hydrolase (BSH, EC 3.5.1.24) from intestinal microbes, which reduces the serum cholesterol level. In this study, four predicted bile salt hydrolase (bsh) genes from Lactobacillus plantarum ST-III were cloned into pET-28b(+) vector and expressed in Escherichia coli. The hydrolysis activity of these enzymes was 29.00, 20.49, 24.90 U/mL and 21.13 U/mL, respectively.

Key words: Lactobacillus plantarum, bile salt hydrolase, expression, enzyme activity

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