食品科学 ›› 2010, Vol. 31 ›› Issue (21): 254-257.doi: 10.7506/spkx1002-6630-201021057

• 生物工程 • 上一篇    下一篇

乳酸菌胞外蛋白水解酶基因的克隆及在大肠杆菌中的表达

杨桂连,秦守涛,刘 琼,王春凤*   

  1. 吉林农业大学动物科学技术学院
  • 收稿日期:2009-12-16 出版日期:2010-11-15 发布日期:2010-12-29
  • 通讯作者: 王春凤 E-mail:wangchunfeng@jlau.edu.cn
  • 基金资助:

    国家“863”计划项目(2007AA10Z322;2006AA10A205);
    国家自然科学基金项目(30671573;30700602;30870116);吉林省科技发展计划项目(20080104)

Cloning of Extracellular Protease Gene from Lactobacillus and Expression in Escherichia coli

YANG Gui-lian,QIN Shou-tao,LIU Qiong,WANG Chun-feng*   

  1. College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China
  • Received:2009-12-16 Online:2010-11-15 Published:2010-12-29
  • Contact: WANG Chun-feng E-mail:wangchunfeng@jlau.edu.cn

摘要:

目的:构建连接乳酸菌胞外蛋白水解酶基因的非抗性重组质粒。方法:以瑞士乳杆菌基因组DNA 为模板,克隆胞外蛋白水解酶基因,连接到以thyA 为选择压力的非抗性穿梭表达载体pW425et 上,构建重组质粒pW425et-R,转化入thyA 基因缺陷型E.coli X13 感受态细胞,SDS-PAGE 电泳检测显示该水解酶得到了表达。结果:成功构建了重组质粒pW425et-R,胞外蛋白水解酶基因在E.coli X13 中得到正确表达。结论:成功地表达了乳酸菌胞外蛋白水解酶基因,可为进一步制备具降血压功能基因工程乳酸菌提供参考。

关键词: 乳酸菌, 胞外蛋白水解酶, 降血压活性肽, 克隆, 表达

Abstract:

Objective: To construct a recombinant plasmid carrying extracellular protease gene from Lactobacillus. Methods: The extracellular protease gene was cloned from genomic DNA of L. helveticus and inserted into the expression vector pW425et. Then the recombination plasmid was transformed into the competence thyA gene-mutant E. coli X13. The expressed protein was analyzed by SDS-PAGE. Results: The recombinant shuttle plasmid pW425et-R was constructed successfully and the Lactobacillus extracellular proteinase gene was expressed in E. coli X13. Conclusion: Our research idea is feasible for the successful expression of Lactobacillus extracellular protease gene in E. coli X13, which will provide a basis for further preparation of recombinant Lactobacillus with anti-hypertensive function.

Key words: Lactobacillus, extracellular protease, anti-hypertensive peptide, cloning, expression

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