食品科学 ›› 2011, Vol. 32 ›› Issue (15): 182-185.doi: 10.7506/spkx1002-6630-201115041

• 生物工程 • 上一篇    下一篇

二硫键对Enterocin A抗李斯特菌LIN 3活性的影响

赵爱珍,徐兴然,韩文瑜   

  1. 1. 西南大学药学院
    2.吉林大学畜牧兽医学院
  • 收稿日期:2018-04-20 修回日期:2018-04-20 出版日期:2011-08-15 发布日期:2011-07-26

Effect of Disulfide Bond on Anti-Listeria innocua LIN3 Activity of Enterocin A

ZHAO Ai-zhen1,XU Xing-ran1,HAN Wen-yu2   

  1. (1. College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China; 2. College of Animal Science and Veterinary Medicine, Jilin University, Changchun 130062, China)
  • Received:2018-04-20 Revised:2018-04-20 Online:2011-08-15 Published:2011-07-26

摘要: 依据Enterocin A的氨基酸序列,设计半胱氨酸替换突变体Enterocin A(C14S)和Enterocin A(C47W),通过大肠杆菌表达系统获得重组突变体。用还原剂β-巯基乙醇处理MBP-Enterocin A。采用琼脂扩散实验检测重组Enterocin A、突变体及还原产物的抗无害李斯特菌LIN3活性。结果表明:N末端融合部分不含有半胱氨酸的MBP-Enterocin A或His tag-Enterocin A均表现强抗菌活性;而N末端融合部分含有半胱氨酸的GST-Enterocin A,表现很弱的抗菌活性;半胱氨酸替换突变体及MBP-Enterocin A还原产物均不显示抗菌活性。实验结果证明二硫键为Enterocin A活性的重要影响因素。

关键词: Enterocin A, 二硫键, 抗李斯特菌活性

Abstract: Based on the amino acid sequence of Enterocin A, two cysteine substitution mutants, Enterocin A (C14S) and Enterocin A (C47W) were designed and obtained in E. coli expression systems. The agar diffusion assay was used to test the anti-Listeria innocua LIN3 activity of the mutants, recombinant Enterocin A and β-mercaptoethanol-reduced recombinant Enterocin A. Recombinant Enterocin A with His-tag at N-terminus revealed stronger antibacterial activity, while GST-Enterocin A revealed a significant decrease in antibacterial activity. The two mutants andβ-mercaptoethanol-reduced recombinant Enterocin A with destroyed disulfide bonds exhibit no detectable antibacterial activity. Therefore, disulfide bonds are essential for the antibacterial activity of Enterocin A.

Key words: Enterocin A, disulfide bond, anti-Listeria activity

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