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.
复制标题
DOI:
10.1083/jcb.201802155
复制
发表时间:
2018-12-03
期刊:
影响因子:
--
通讯作者:
Mukhopadhyay A
中科院分区:
文献类型:
--
作者:
Singh PK;Kapoor A;Lomash RM;Kumar K;Kamerkar SC;Pucadyil TJ;Mukhopadhyay A
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.
登录
查看更多内容
影响因子:
7.8
作者:
GARCIADELPORTILLO, F;FINLAY, BB
通讯作者:
FINLAY, BB
影响因子:
30.3
作者:
Arasaki K;Toomre DK;Roy CR
通讯作者:
Roy CR
影响因子:
8.8
作者:
D'Costa, Vanessa M.;Braun, Virginie;Brumell, John H.
通讯作者:
Brumell, John H.
影响因子:
4.8
作者:
Fasshauer, D;Margittai, M
通讯作者:
Margittai, M
影响因子:
3.2
作者:
Bronstein, PA;Miao, EA;Miller, SI
通讯作者:
Miller, SI