Salmonella SipA mimics a cognate SNARE for host Syntaxin8 to promote fusion with early endosomes.

Salmonella SipA mimics a cognate SNARE for host Syntaxin8 to promote fusion with early endosomes.
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DOI:
10.1083/jcb.201802155
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发表时间:
2018-12-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Mukhopadhyay A
Mukhopadhyay A
中科院分区:
其他
文献类型:
--
作者:
Singh PK;Kapoor A;Lomash RM;Kumar K;Kamerkar SC;Pucadyil TJ;Mukhopadhyay A

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细胞内病原体可以调节宿主 Rab 和 SNARE,以支持其复制和免疫逃避。辛格等人。表明沙门氏菌效应器 SipA 在功能上模仿 R-SNARE 并招募宿主 Q-SNARE 以促进膜融合。因此,这种细胞内病原体效应子的 SNARE 模拟调节了沙门氏菌存活的宿主运输机制。 SipA 是沙门氏菌的主要效应子,可引起胃肠炎和肠热病。 Caspase-3 将 SipA 切割成两个结构域:C 端结构域调节肌动蛋白聚合,而 N 端的功能未知。我们发现,切割的 SipA N 末端与宿主 Syntaxin8 (Syn8) 结合并招募到含有沙门氏菌的液泡 (SCV) 上。 SipA N 末端包含一个 SNARE 基序,该基序具有保守的精氨酸残基,类似于哺乳动物的 R-SNARE。 SipAR204Q 和 SipA1–435R204Q 不结合 Syn8,表明 SipA 模拟 Syn8 的同源 R-SNARE。因此,缺乏 SipA 或表达 SipA1-435R204Q SNARE 突变体的沙门氏菌无法将 Syn8 招募到 SCV。最后,我们表明 SipA 模仿 R-SNARE 将 Syn8、Syn13 和 Syn7 招募到 SCV 并促进其与早期内体的融合,从而有可能阻止其成熟。我们的结果表明,SipA 在功能上替代了内源性 SNARE,以劫持宿主贩运途径并促进沙门氏菌存活。
Intracellular pathogens can modulate host Rabs and SNAREs to support their replication and immune evasion. Singh et al. show that the Salmonella effector SipA functionally mimics an R-SNARE and recruits host Q-SNAREs to promote membrane fusion. Thus, SNARE mimicry by this intracellular pathogen effector modulates the host trafficking machinery for Salmonella survival. SipA is a major effector of Salmonella, which causes gastroenteritis and enteric fever. Caspase-3 cleaves SipA into two domains: the C-terminal domain regulates actin polymerization, whereas the function of the N terminus is unknown. We show that the cleaved SipA N terminus binds and recruits host Syntaxin8 (Syn8) to Salmonella-containing vacuoles (SCVs). The SipA N terminus contains a SNARE motif with a conserved arginine residue like mammalian R-SNAREs. SipAR204Q and SipA1–435R204Q do not bind Syn8, demonstrating that SipA mimics a cognate R-SNARE for Syn8. Consequently, Salmonella lacking SipA or that express the SipA1–435R204Q SNARE mutant are unable to recruit Syn8 to SCVs. Finally, we show that SipA mimicking an R-SNARE recruits Syn8, Syn13, and Syn7 to the SCV and promotes its fusion with early endosomes to potentially arrest its maturation. Our results reveal that SipA functionally substitutes endogenous SNAREs in order to hijack the host trafficking pathway and promote Salmonella survival.
将鼠伤寒沙门氏菌靶向含有溶酶体膜糖蛋白的囊泡,绕过带有甘露糖6-磷酸受体的室。
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