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结合Hfq的小RNA PqsS调节了Pseudomonas aeruginosa pqs的定数感应系统和毒性

Tianyuan Jia^1,2, Xianbiao Bi^1,2, Menglu Li^1,2

¹Shenzhen National Clinical Research Center for Infectious Disease, Shenzhen Third People's Hospital, The Second Affiliated Hospital of Southern University of Science and Technology, Shenzhen, China.

NPJ biofilms and microbiomes

|September 11, 2024

概括

这项研究确定了PqsS,Pseudomonas aeruginosa中的一个小RNA,通过调节pqs QS系统来增强急性感染,同时减少慢性感染. 它为治疗P. aeruginosa感染提供了新的点.

科学领域:

微生物学微生物学
分子生物学分子生物学
细菌病原体的产生

背景情况:

Pseudomonas aeruginosa 是医院感染的主要原因,导致急性和慢性疾病.
由Hfq蛋白调节的小RNA (sRNA) 对细菌毒性和信号通路至关重要.
伪类昆龙信号 (PQS) 的定数感应系统调节了P. aeruginosa的病原性.

研究的目的:

在P. aeruginosa中识别和表征一种新的Hfq结合sRNA,PqsS.
调查PqsS在调节细菌致病性和PQS定数感应系统中的作用.
阐明PqsS影响P. aeruginosa感染的分子机制.

主要方法:

在P. aeruginosa PAO1.1.中识别Hfq结合的sRNA.
试验评估PqsS对急性感染特征 (宿主细胞死亡,蜂群运动) 的影响.
评估PqsS对慢性感染特征的影响 (生物膜形成,抗生素耐药性).
对pqsL转录和PQS水平的PqsS调节的分析.
研究了PqsS,pqsL mRNA和RNase E.之间的相互作用.

主要成果:

PqsS被确定为一种Hfq结合的sRNA,它促进了P. aeruginosa的致病性.
PqsS通过增加宿主细胞死亡和拉姆诺脂质介导的群流动性来增强急性感染.
PqsS可以降低慢性感染的特征,包括生物膜形成和抗生素耐药性.
PqsS抑制了pqsL转录水平,导致PQS产量增加和pqs QS系统的激活.
在PQS增强PqsS表达的地方观察到一个积极的反循环.
PqsS使用RNase E来破坏pqsLmRNA的稳定和降解.

结论:

PqsS是P. aeruginosa毒性的关键调节者,平衡了急性和慢性感染策略.
通过PqsS介导的pqs QS系统的调节对于P. aeruginosa的发病过程至关重要.
PqsS代表了控制P. aeruginosa感染的潜在治疗标.

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