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mscM基因对Cronobacter sakazakii干燥耐药性的影响

Dongdong Zhu¹, Zhengyang Zhang¹, Ping Li¹

¹State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China.

|January 8, 2025

概括

在Cronobacter sakazakii中,机械敏感通道MscM对于抗干燥性至关重要. 它的缺失增加了膜的透性,影响了离子平衡,影响了细菌的生存和生物膜的形成.

科学领域:

微生物学微生物学
食品安全食品安全
分子生物学分子生物学

背景情况:

克罗诺巴克特 (Cronobacter sakazakii) 是一种机会性食物传染病原体.
它对透应激和干燥应激的抗性尚未完全理解.
机械敏感通道MscM是对抗干燥的潜在贡献者.

研究的目的:

调查mscM基因在C. sakazakii干燥耐药性中的作用.
阐明MscM在调节细胞膜透性和离子稳态中的分子机制.
评估mscM删除对细菌表面特性和毒性因子的影响.

主要方法:

构建mscM突变 (ΔmscM) 和补充菌株.
对干燥生存率,膜透性和细胞内离子含量 (K+,Na+,Ca2+,Mg2+) 的分析.
评估细菌生长,运动性,表面水性,粘附/侵入性和生物膜的形成.

主要成果:

ΔmscM菌株在干燥应激后的无活化率下降了15.83%.
mscM删除增加了膜的透性和细胞内K+含量2.2倍.
在ΔmscM菌株中,表面疏水性,粘附/侵入性和生物膜形成显著降低.

结论:

MscM通过控制K+流出来调节细胞膜的透性,维持透性稳态和干燥耐受性.
mscM基因对于C. sakazakii的抗干燥能力,表面特性和生物膜形成至关重要.
这项研究提供了对MscM在C. sakazakii生存和毒性的作用的见解.

关键词:

克罗诺巴克特 (Cronobacter sakazakii) 已经被发现生物膜是一种生物膜.抗干燥的耐干燥性 mscMM 在线观看离子是一种离子.

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