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一个小的周等离子体蛋白通过调节DbfRS双组分系统来控制Vibrio cholerae中广泛的生理适应

Emmy Nguyen¹, Charles Agbavor², Anjali Steenhaut³

¹Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

bioRxiv : the preprint server for biology

|April 8, 2025

概括

细菌使用两组系统来适应,但许多机制尚不清楚. 我们发现DbfQ调节了Vibrio cholerae中的DbfRS系统,控制了生物膜的分散,并为新的抗感染药物提供了潜在的目标.

科学领域:

微生物学微生物学
细菌生理学细菌生理学
信号转导信号转导

背景情况:

两个组成的信号系统使细菌能够适应环境刺激.
在 * Vibrio cholerae * 中的 DbfRS 系统对于生物膜的形成,持久性和宿主殖民是至关重要的.
许多细菌的两组系统的精确感官机制仍然不完全理解.

研究的目的:

在 *Vibrio cholerae* 中识别DbfRS双组分系统的新型调节剂.
阐明周等离子体蛋白在调节细菌信号通路中的作用.
探索DbfRS途径作为对抗细菌感染的治疗点的潜力.

主要方法:

蛋白质与蛋白质相互作用研究以确定DbfQ作为DbfS结合剂.
酶活性测试以确定DbfQ对DbfS酸酶活性的影响.
转录组分析 (RNA-seq) 来评估DbfR酸化诱导的基因表达变化.
在体内感染模型评估与构成性DbfR酸化相关的健康成本.

主要成果:

DbfQ是一种周等离子体蛋白,直接结合并激活基酶DbfS的酸酶活性,促进生物膜分散.
外膜扰动会触发DbfR酸化,导致显著的转录重编程.
DbfR酸化影响涉及生物膜动态,新陈代谢,细胞壁合成和应激反应的基因.
构成DbfR酸化严重损害了感染期间的细菌健康.
类似DbfQRS的模块在多种不同的细菌族群中保存着.

结论:

DbfQ代表了一种新型的周等离子调节器类,可以微调双组分信号传输.
DbfRS路径集成环境线索来控制细菌的适应和毒性.
针对DbfRS系统,特别是DbfQ的监管功能,有望开发新的抗感染策略.

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