MvaT binds to the P(exsC) promoter to repress the type III secretion system in Pseudomonas aeruginosa.

MvaT binds to the P(exsC) promoter to repress the type III secretion system in Pseudomonas aeruginosa.
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DOI:
10.3389/fcimb.2023.1267748
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发表时间:
2023
影响因子:
5.7
通讯作者:
--
中科院分区:
医学2区
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--
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铜绿假单胞菌是一种能够引起各种急性和慢性感染的机会性人类病原体。其III型分泌系统(T3SS)在急性感染发病过程中起关键作用。ExsA是激活所有T3SS基因表达的主调控因子。exsA的转录是由两个不同的启动子驱动的,它自己的启动子pexsa和它的操纵子启动子pexsc。在这里,结合DNA下拉试验和质谱分析,我们发现组蛋白样核结构(H-NS)家族蛋白MvaT可以结合到pexsc启动子上。通过EMSA和报告基因分析,我们进一步发现MvaT直接与pexsc启动子结合,抑制T3SS基因的表达。MvaT对P exsC的抑制不依赖于ExsA, MvaT结合在相对于exsC基因转录起始位点的-429至-380 bp区域。本研究进一步揭示了铜绿假单胞菌中T3SS的复杂调控网络。
Pseudomonas aeruginosa is an opportunistic human pathogen capable of causing a variety of acute and chronic infections. Its type III secretion system (T3SS) plays a critical role in pathogenesis during acute infection. ExsA is a master regulator that activates the expression of all T3SS genes. Transcription of exsA is driven by two distinct promoters, its own promoter P exsA and its operon promoter P exsC . Here, in combination with a DNA pull-down assay and mass spectrometric analysis, we found that a histone-like nucleoid-structuring (H-NS) family protein MvaT can bind to the P exsC promoter. Using EMSA and reporter assays, we further found that MvaT directly binds to the P exsC promoter to repress the expression of T3SS genes. The repression of MvaT on P exsC is independent of ExsA, with MvaT binding to the -429 to -380 bp region relative to the transcription start site of the exsC gene. The presented work further reveals the complex regulatory network of the T3SS in P. aeruginosa.
DOI: 10.3389/fcimb.2022.1064010
发表时间: 2022
影响因子: 5.7
作者:
通讯作者: --
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