The second extracellular loop dictates Occludin-mediated HCV entry.

The second extracellular loop dictates Occludin-mediated HCV entry.
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DOI:
10.1016/j.virol.2010.08.009
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发表时间:
2010-11-10
期刊:
影响因子:
3.7
通讯作者:
Wang T
Wang T
中科院分区:
医学3区
文献类型:
--
作者:
Liu S;Kuo W;Yang W;Liu W;Gibson GA;Dorko K;Watkins SC;Strom SC;Wang T

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最近的研究发现,紧密连接(TJ)蛋白封闭蛋白(OCLN)是丙型肝炎病毒(HCV)进入人肝细胞的重要因子。为了深入了解OCLN介导的HCV进入,我们创建了一组OCLN缺失突变体,并发现在不损害OCLN的细胞表面定位的情况下,从OCLN中去除细胞外环2(EL 2)消除了其介导HIV-HCV假型(HCVpp)进入的能力以及其共沉淀HCV糖蛋白E2的能力。然而,重组OCLN EL 2在下拉测定中未能稳健地结合可溶性E2(sE 2)。随后的研究表明,OCLN与发动蛋白II形成复合物,发动蛋白II是一种重要的内吞作用的GT3,以EL 2依赖的方式。HCVpp以及细胞培养生长的HCV(HCVpp)对发动蛋白敲低或抑制敏感。我们的结论是OCLN EL 2决定了发动蛋白依赖性HCV的进入。此外,OCLN还能将病毒体与发动蛋白依赖的内吞机制连接起来.
Recent findings have implicated tight junction (TJ) protein Occludin (OCLN) as an essential factor for Hepatitis C Virus (HCV) to enter human hepatocytes. To gain insights into OCLN-mediated HCV entry, we created a panel of OCLN deletion mutants and found that without impairing OCLN’s cell surface localization, removal of the extracellular loop 2 (EL2) from OCLN abolished both its ability to mediate HIV-HCV pseudotypes’ (HCVpp) entry as well as its ability to coprecipitate HCV glycoprotein E2. Recombinant OCLN EL2, however, failed to robustly bind soluble E2 (sE2) in pull-down assays. Subsequent studies revealed that OCLN formed complex with Dynamin II, an important GTPase for endocytosis, in an EL2-dependent fashion. HCVpp, as well as cell culture grown HCV (HCVcc), was sensitive to Dynamin knockdown or inhibition. We conclude that OCLN EL2 dictates the Dynamin-dependent HCV entry. Furthermore, OCLN could function to bridge virions to Dynamin -dependent endocytic machineries.
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