Structure and function of Salmonella SifA indicate that its interactions with SKIP, SseJ, and RhoA family GTPases induce endosomal tubulation.

Structure and function of Salmonella SifA indicate that its interactions with SKIP, SseJ, and RhoA family GTPases induce endosomal tubulation.
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DOI:
10.1016/j.chom.2008.08.012
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发表时间:
2008-11-13
影响因子:
30.3
通讯作者:
Miller SI
Miller SI
中科院分区:
医学1区
文献类型:
--
作者:
Ohlson MB;Huang Z;Alto NM;Blanc MP;Dixon JE;Chai J;Miller SI

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鼠伤寒沙门氏菌III型分泌效应蛋白SifA对于诱导沙门氏菌吞噬体的管状化至关重要,并与哺乳动物驱动蛋白结合蛋白SKIP结合。SifA与效应蛋白SseJ共表达可诱导哺乳动物细胞内体的管状化,这与沙门氏菌感染所诱导的情况相似。有趣的是,结合GTP的RhoA、RhoB和RhoC在与SseJ共表达时也可诱导内体管状化(ET),这表明SifA可能模拟或激活一种RhoA家族的GTP酶。SifA与SKIP的PH结构域复合物的结构显示,SifA具有两个不同的结构域;其氨基末端与SKIP结合,羧基末端具有与SopE相似的折叠结构,SopE是一种具有Rho GTP酶鸟嘌呤核苷酸交换因子活性(GEF)的沙门氏菌效应蛋白。与GEF类似,SifA与结合GDP的RhoA相互作用,并且纯化的SseJ和RhoA形成一种蛋白质复合物,这表明SifA、SKIP、SseJ和RhoA家族的GTP酶协同促进宿主细胞膜的管状化。
The Salmonella typhimurium type III secretion effector protein SifA is essential for inducing tubulation of the Salmonella phagosome and binds the mammalian kinesin-binding protein SKIP. Co-expression of SifA with the effector SseJ induced tubulation of mammalian cell endosomes, similar to that induced by Salmonella infection. Interestingly, GTP bound RhoA, RhoB, and RhoC also induced endosomal tubulation (ET) when co-expressed with SseJ, indicating that SifA likely mimics or activates a RhoA-family GTPase. The structure of SifA in complex with the PH domain of SKIP revealed that SifA has two distinct domains; the amino-terminus binds SKIP and the carboxyl-terminus has a fold similar to SopE, a Salmonella effector with Rho GTPase guanine nucleotide exchange factor activity (GEF). Similar to GEFs, SifA interacted with GDP-bound RhoA, and purifed SseJ and RhoA formed a protein complex, suggesting that SifA, SKIP, SseJ, and RhoA family GTPases cooperatively promote host membrane tubulation.
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