食品科学 ›› 2022, Vol. 43 ›› Issue (18): 105-112.doi: 10.7506/spkx1002-6630-20211002-006

• 生物工程 • 上一篇    

群体感应系统对单增李斯特菌生物被膜形成的影响

张心怡,陆兆新,郑丽平,吕紫岩,周立邦,孟凡强,别小妹   

  1. (南京农业大学食品科学与技术学院,江苏 南京 210095)
  • 发布日期:2022-09-28
  • 基金资助:
    “十三五”国家重点研发计划重点专项(2018YFC1602500);国家自然科学基金面上项目(31972174)

Effect of Quorum Sensing Systems on Biofilm Formation by Listeria monocytogenes

ZHANG Xinyi, LU Zhaoxin, ZHENG Liping, LÜ Ziyan, ZHOU Libang, MENG Fanqiang, BIE Xiaomei   

  1. (College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China)
  • Published:2022-09-28

摘要: 以单增李斯特菌(Listeria monocytogenes)为研究对象,分析Agr群体感应系统和LuxS/AI-2系统对其生物被膜形成的调控作用。通过同源重组对LMB33426菌株进行agrD基因以及luxS基因的无痕敲除,比较野生菌株与agrD、luxS基因缺失菌株的生物被膜特性差异。结果表明,与野生株相比,ΔagrD突变株和ΔluxS突变株的生物被膜形成能力下降;ΔagrD突变株的疏水性显著下降,在37 ℃下的泳动能力较野生株增强;群体感应系统基因敲除对菌株的耐药性没有产生较大影响。基因缺失株的构建为进一步研究群体感应系统对单增李斯特菌生物被膜形成的调控机制提供参考,同时为单增李斯特菌的预防控制奠定了基础。

关键词: 单增李斯特菌;生物被膜;agrD基因;luxS基因;同源重组

Abstract: This work was undertaken to study the regulatory effects of the Agr and LuxS/AI-2 quorum sensing systems on biofilm formation by Listeria monocytogenes (Lm). The agrD and luxS genes of LMB33426 were knocked out by homologous recombination, and the biofilm formation characteristics of the wild-type and mutant strains were investigated comparatively. The results showed that the biofilm formation ability of ΔagrD and ΔluxS was reduced compared with that of the wild-type strain. The hydrophobicity of ΔagrD decreased significantly, and its swimming mobility was higher than that of the wild-type strain at 37 ℃. However, no significant difference was found in drug resistance between the wild-type and mutant strains. This study provides a basis for further research on the regulatory mechanism of quorum sensing systems on biofilm formation by Lm and more broadly, for the development of novel strategies for the prevention and control of Lm infections.

Key words: Listeria monocytogenes; biofilm; agrD gene; luxS gene; homologous recombination

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