Autophagy protein ATG5 interacts transiently with the hepatitis C virus RNA polymerase (NS5B) early during infection.

Autophagy protein ATG5 interacts transiently with the hepatitis C virus RNA polymerase (NS5B) early during infection.
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DOI:
10.1016/j.virol.2010.05.032
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发表时间:
2010-09-15
期刊:
影响因子:
3.7
通讯作者:
Labonté P
Labonté P
中科院分区:
医学3区
文献类型:
--
作者:
Guévin C;Manna D;Bélanger C;Konan KV;Mak P;Labonté P

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自噬是ATG 5启动双膜囊泡(DMV)形成的重要细胞过程。在感染后,DMV已被证明携带正链RNA病毒(如MHV、脊髓灰质炎病毒和马动脉炎病毒)的复制酶复合物。最近的研究表明,自噬蛋白是前病毒因子,有利于启动丙型肝炎病毒(HCV)感染。在这里,我们确定了ATG 5作为HCV NS 5 B的相互作用蛋白。通过co-IP和代谢标记研究证实了ATG 5/NS 5 B相互作用。此外,ATG 5蛋白与NS 4 B共定位,NS 4 B是膜网的组成部分。重要的是,免疫荧光染色表明,在感染后2天,ATG 5和NS 5 B在感染细胞的核周区域内强烈共定位。然而,共定位是完全缺乏在5 DPI,这表明HCV利用ATG 5作为病毒感染的发病过程中的前病毒因子。最后,通过ATG 5沉默抑制自噬阻断HCV复制。
Autophagy is an important cellular process by which ATG5 initiates the formation of double membrane vesicles (DMVs). Upon infection, DMVs have been shown to harbor the replicase complex of positive-strand RNA viruses such as MHV, poliovirus, and equine arteritis virus. Recently, it has been shown that autophagy proteins are proviral factors that favor initiation of hepatitis C virus (HCV) infection. Here, we identified ATG5 as an interacting protein for the HCV NS5B. ATG5/NS5B interaction was confirmed by co-IP and metabolic labeling studies. Furthermore, ATG5 protein colocalizes with NS4B, a constituent of the membranous web. Importantly, immunofluorescence staining demonstrated a strong colocalization of ATG5 and NS5B within perinuclear regions of infected cells at 2 days postinfection. However, colocalization was completely lacking at 5 DPI, suggesting that HCV utilizes ATG5 as a proviral factor during the onset of viral infection. Finally, inhibition of autophagy through ATG5 silencing blocks HCV replication.
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