Molecular mechanisms of master regulator VqsM mediating quorum-sensing and antibiotic resistance in Pseudomonas aeruginosa.

Molecular mechanisms of master regulator VqsM mediating quorum-sensing and antibiotic resistance in Pseudomonas aeruginosa.
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DOI:
10.1093/nar/gku586
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发表时间:
2014
影响因子:
14.9
通讯作者:
Wu M
Wu M
中科院分区:
生物学2区
文献类型:
--
作者:
Liang H;Deng X;Li X;Ye Y;Wu M

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铜绿假单胞菌的群体感应(QS)系统有助于细菌的稳态和致病性。虽然AraC家族转录因子VqsM已被表征为控制毒力因子和QS信号分子的产生,但其详细的调控机制仍然是难以捉摸的。在这里,我们报告说,VqsM直接结合到lasI启动子区,从而调节其表达。为了鉴定铜绿假单胞菌PAO 1中VqsM的其他靶点,我们进行了染色质免疫沉淀(ChIP),然后进行了高通量DNA测序(ChIP-seq),并在铜绿假单胞菌基因组中检测到48个富含VqsM结合峰的基因座。这些基因的直接调控VqsM已被证实的电泳迁移率变动分析和定量实时聚合酶链反应。通过使用MEME套件鉴定VqsM结合基序,并通过体外足迹测定进行验证。此外,VqsM直接结合到抗生素抗性调节因子NfxB和主III型分泌系统(T3 SS)调节因子ExsA的启动子区。值得注意的是,与野生型PAO 1相比,vqsM突变体对两种类型的抗生素表现出更强的耐药性,并促进了小鼠模型中的细菌存活。总的来说,这项工作提供了新的线索,以更好地了解QS系统,T3 SS和抗生素耐药性的详细调控网络。
The Pseudomonas aeruginosa quorum-sensing (QS) systems contribute to bacterial homeostasis and pathogenicity. Although the AraC-family transcription factor VqsM has been characterized to control the production of virulence factors and QS signaling molecules, its detailed regulatory mechanisms still remain elusive. Here, we report that VqsM directly binds to the lasI promoter region, and thus regulates its expression. To identify additional targets of VqsM in P. aeruginosa PAO1, we performed chromatin immunoprecipitation (ChIP) followed by high-throughput DNA sequencing (ChIP-seq) and detected 48 enriched loci harboring VqsM-binding peaks in the P. aeruginosa genome. The direct regulation of these genes by VqsM has been confirmed by electrophoretic mobility shift assays and quantitative real-time polymerase chain reactions. A VqsM-binding motif was identified by using the MEME suite and verified by footprint assays in vitro. In addition, VqsM directly bound to the promoter regions of the antibiotic resistance regulator NfxB and the master type III secretion system (T3SS) regulator ExsA. Notably, the vqsM mutant displayed more resistance to two types of antibiotics and promoted bacterial survival in a mouse model, compared to wild-type PAO1. Collectively, this work provides new cues to better understand the detailed regulatory networks of QS systems, T3SS, and antibiotic resistance.
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