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
中科院分区:
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
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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