毒素基因tdh2可以保护Vibrio parahaemolyticus免受胃肠道压力
Qin Guo1, Jia-Er Liu1, Lin-Xue Liu1
1School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
Microorganisms
|August 28, 2025
概括
这种Vibrio parahaemolyticus tdh2毒素基因保护细菌免受胃酸和胆汁的影响. 删除tdh2会降低存活率,而其存在会增加对胃肠道疾病的耐受性.
科学领域:
- 微生物学
- 食品安全问题
- 细菌致病性
背景情况:
- 微生物是引起海鲜相关疾病的重要传染病原体.
- tdh2基因是V. parahaemolyticus的一个关键毒性因子.
研究的目的:
- 研究tdh2基因在胃肠道压力条件下的V. parahaemolyticus生存中的作用.
- 阐明底层的tdh2介导应力耐受性的分子机制.
主要方法:
- 对V. parahaemolyticus的tdh2删除和补充菌株的构建
- 在酸性 (pH 3,4) 和胆汁性 (2%) 压力下评估细菌生存率.
- 基因表达分析 (RT-qPCR) 和蛋白质组分析 (LC-MS/MS) 以确定差异表达的基因和代谢物.
主要成果:
- 与野生类型 (WT) 相比,tdh2删除突变 (VP: △tdh2) 对酸和胆压的敏感性增加.
- 在寒冷 (4°C) 和胆汁压力下,tdh2表达上调 (0.9%).
- 删除tdh2改变了参与膜传输 (ompU,ABC传输体) 和应激反应 (vtrA,vtrB,nhaR,rpoS) 的关键基因的表达.
- 在VP: △tdh2菌株中,代谢分析显示了脂 (脂,脂糖),黄素单核酸和核酸的显著变化.
结论:
- tdh2在增强V. parahaemolyticus对酸和胆压的耐受性方面发挥着至关重要的保护作用.
- 保护机制包括维护细胞膜完整性和提高电子传输效率.
- 了解tdh2的功能为控制由tdh2阳性V. parahaemolyticus引起的食物中毒提供了洞察力.
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