YjbH mediates the oxidative stress response and infection by regulating SpxA1 and the phosphoenolpyruvate-carbohydrate phosphotransferase system (PTS) in Listeria monocytogenes.

YjbH mediates the oxidative stress response and infection by regulating SpxA1 and the phosphoenolpyruvate-carbohydrate phosphotransferase system (PTS) in Listeria monocytogenes.
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YjbH 通过调节单核细胞增生李斯特菌中的 SpxA1 和磷酸烯醇丙酮酸-碳水化合物磷酸转移酶系统 (PTS) 介导氧化应激反应和感染

DOI:
10.1080/19490976.2021.1884517
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发表时间:
2021-01
期刊:
影响因子:
12.2
通讯作者:
Song H
Song H
中科院分区:
医学2区
文献类型:
--
作者:
Cheng C;Han X;Xu J;Sun J;Li K;Han Y;Chen M;Song H

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摘要食源性病原体单核细胞增生李斯特菌依赖于其对快速变化的环境做出反应的能力来微调毒力因子和应激调节剂的表达。在这里,我们揭示了YjbH,一个假定的硫氧还蛋白家族氧化还原酶,在细菌适应氧化应激和宿主感染中起着关键作用。YjbH直接与SpxA 1相互作用,SpxA 1是ArsC家族的氧化应激反应调节因子,YjbH的缺失降低了L.单核细胞增多症此外,YjbH是细菌在宿主细胞中传播和在小鼠器官中增殖所必需的,从而有助于毒力。转录组学分析表明,在没有YjbH的情况下,大多数毒力基因和磷酸烯醇化酸-碳水化合物磷酸转移酶系统(PTS)基因表达显著下调。然而,当细菌在培养基中生长时,YjbH抑制PrfA表达,表明YjbH通过涉及PrfA和PTS的复杂调控网络参与调控毒力基因。总的来说,这些研究结果提供了一个有价值的模型,澄清作用的硫氧还蛋白从食源性病原体提高生存在外部环境中,更重要的是,成功地建立感染内的主机。
ABSTRACT The foodborne pathogen Listeria monocytogenes relies on its ability to fine-tune the expression of virulence factors and stress regulators in response to rapidly changing environments. Here, we reveal that YjbH, a putative thioredoxin family oxidoreductase, plays a pivotal role in bacterial adaption to oxidative stress and host infection. YjbH directly interacts with SpxA1, an ArsC family oxidative stress response regulator, and the deletion of YjbH compromised the oxidative stress tolerance of L. monocytogenes. Also, YjbH is required for the bacterial spread in host cells and proliferation in mouse organs, thereby contributing to virulence. Transcriptomic analysis of strains treated with Cd2+ revealed that most virulence genes and phosphoenolpyruvate-carbohydrate phosphotransferase system (PTS) genes were significantly downregulated in the absence of YjbH. However, YjbH inhibits PrfA expression when bacteria were grown in the media, suggesting that YjbH participates in regulating the virulence genes via a complicated regulatory network involving PrfA and PTS. Collectively, these findings provide a valuable model for clarifying the roles of thioredoxins from foodborne pathogens regarding improving survival in the external environment and, more importantly, successfully establishing infection within the host.
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