Sorting nexin 5 mediates virus-induced autophagy and immunity.

Sorting nexin 5 mediates virus-induced autophagy and immunity.
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分类连接蛋白5介导病毒诱导的自噬和免疫。

DOI:
10.1038/s41586-020-03056-z
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发表时间:
2021-01
期刊:
影响因子:
64.8
通讯作者:
Levine B
Levine B
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Dong X;Yang Y;Zou Z;Zhao Y;Ci B;Zhong L;Bhave M;Wang L;Kuo YC;Zang X;Zhong R;Aguilera ER;Richardson RB;Simonetti B;Schoggins JW;Pfeiffer JK;Yu L;Zhang X;Xie Y;Schmid SL;Xiao G;Gleeson PA;Ktistakis NT;Cullen PJ;Xavier RJ;Levine B

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自噬是一种溶酶体降解途径,在免疫的多个方面发挥重要作用,包括免疫系统发育、先天性和适应性免疫和炎症反应的调节、细胞内微生物的选择性降解以及宿主对感染性疾病的保护。与营养剥夺和mTOR抑制等刺激诱导的自噬不同,对哺乳动物细胞中自噬体生物合成如何响应病毒感染知之甚少。我们进行了全基因组siRNA筛选,发现内体蛋白分选连接蛋白5(SNX 5)是病毒诱导的自噬所必需的,但不是基础的,应力或内体诱导的自噬。我们发现,SNX 5缺失增加了体外细胞对病毒感染的易感性,并且小鼠中的Snx 5敲除增强了多种人类病毒感染后的致死率。在机制上,SNX 5与beclin 1和含ATG 14的III类磷脂酰肌醇3-激酶(PI 3 KC 3)复合物1(PI 3 KC 3-C1)相互作用,增加纯化的PI 3 KC 3-C1的脂质激酶活性,并且是PI 3 P的内体生成和PI 3 P结合蛋白WIPI 2向含病毒体的内体募集所需的。这些发现确定了一种背景和细胞器特异性机制-SNX 5依赖性PI 3 KC 3-C1在内体激活-用于病毒感染期间的自噬启动。
Autophagy, a lysosomal degradation pathway, plays an essential role in multiple aspects of immunity, including immune system development, regulation of innate and adaptive immune and inflammatory responses, selective degradation of intracellular microbes, and host protection against infectious diseases. Unlike autophagy induction by stimuli such as nutrient deprivation and mTOR suppression, little is known about how autophagosomal biogenesis is initiated in mammalian cells in response to viral infection. We performed genome-wide siRNA screens and found that the endosomal protein sorting nexin 5 (SNX5) is essential for virus-induced, but not for basal, stress- or endosome-induced, autophagy. We showed that SNX5 deletion increases cellular susceptibility to viral infection in vitro, and that Snx5 knockout in mice enhances lethality after infection with multiple human viruses. Mechanistically, SNX5 interacts with beclin 1 and ATG14-containing Class III phosphatidylinositol 3-kinase (PI3KC3) complex 1 (PI3KC3-C1), increases the lipid kinase activity of purified PI3KC3-C1, and is required for endosomal generation of PI3P and recruitment of the PI3P-binding protein WIPI2 to virion-containing endosomes. These findings identify a context- and organelle-specific mechanism – SNX5-dependent PI3KC3-C1 activation at endosomes – for autophagy initiation during viral infection.
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影响因子: --
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