A bacterial autotransporter impairs innate immune responses by targeting the transcription factor TFE3.

A bacterial autotransporter impairs innate immune responses by targeting the transcription factor TFE3.
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DOI:
10.1038/s41467-023-37812-2
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发表时间:
2023-04-11
影响因子:
16.6
通讯作者:
Vanaja, Sivapriya Kailasan
Vanaja, Sivapriya Kailasan
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ta, Atri;Ricci-Azevedo, Rafael;Vasudevan, Swathy O.;Wright, Skylar S.;Kumari, Puja;Havira, Morena S.;Surendran Nair, Meera;Rathinam, Vijay A.;Vanaja, Sivapriya Kailasan

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I型干扰素(IFN)是抗菌防御中的重要细胞因子。细菌病原体是否以及如何抑制先天免疫受体驱动的I型IFN表达仍然是未知的。通过筛选肠出血性大肠杆菌(EHEC)突变体库,我们发现EhaF,一种未表征的蛋白质,作为包括IFN在内的先天免疫反应的抑制剂。进一步的分析确定EhaF作为一种分泌型自身转运蛋白--一种没有已知先天免疫调节功能的细菌分泌系统--可转位到宿主细胞胞质溶胶中并抑制IFN对EHEC的应答。从机制上讲,EhaF与MiT/TFE家族转录因子TFE 3相互作用并抑制TFE 3,导致TANK磷酸化受损,从而降低IRF 3活化和I型IFN表达。值得注意的是,EhaF介导的先天性免疫抑制促进EHEC在体内的定植和发病。总的来说,这项研究揭示了一种以前未知的基于自动转运蛋白的细菌策略,该策略靶向特定的转录因子以破坏先天宿主防御。先天免疫逃避是细菌致病的一个关键方面。在这里,Ta等人鉴定并鉴定了EhaF,一种细菌自身转运蛋白,其功能是抑制宿主先天免疫并促进肠出血性大肠杆菌的定殖和发病。
Type I interferons (IFNs) are consequential cytokines in antibacterial defense. Whether and how bacterial pathogens inhibit innate immune receptor-driven type I IFN expression remains mostly unknown. By screening a library of enterohemorrhagic Escherichia coli (EHEC) mutants, we uncovered EhaF, an uncharacterized protein, as an inhibitor of innate immune responses including IFNs. Further analyses identified EhaF as a secreted autotransporter—a type of bacterial secretion system with no known innate immune-modulatory function—that translocates into host cell cytosol and inhibit IFN response to EHEC. Mechanistically, EhaF interacts with and inhibits the MiT/TFE family transcription factor TFE3 resulting in impaired TANK phosphorylation and consequently, reduced IRF3 activation and type I IFN expression. Notably, EhaF-mediated innate immune suppression promotes EHEC colonization and pathogenesis in vivo. Overall, this study has uncovered a previously unknown autotransporter-based bacterial strategy that targets a specific transcription factor to subvert innate host defense. Innate immune evasion is a key aspect of bacterial pathogenesis. Here, Ta et al identify and characterise EhaF, a bacterial autotransporter that functions to inhibit host innate immunity and promote the colonisation and pathogenesis of enterohemorrhagic Escherichia coli.
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