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
中科院分区:
文献类型:
--
作者:
Liu S;Kuo W;Yang W;Liu W;Gibson GA;Dorko K;Watkins SC;Strom SC;Wang T
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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