Glycoprotein B switches conformation during murid herpesvirus 4 entry.

Glycoprotein B switches conformation during murid herpesvirus 4 entry.
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DOI:
10.1099/vir.0.83519-0
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发表时间:
2008-06
期刊:
The Journal of general virology
影响因子:
--
通讯作者:
Stevenson PG
Stevenson PG
中科院分区:
其他
文献类型:
--
作者:
Gillet L;Colaco S;Stevenson PG

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疱疹病毒是感染所有脊椎动物的古老病原体。其进入机制中最保守的成分是糖蛋白B(gB),但gB的功能尚不清楚。鼠疱疹病毒4型(MuHV-4)gB的一个显着特征是其对中和的抵抗力。在这里,我们通过感染细胞的直接可视化显示,MuHV-4 gB改变了细胞外病毒体和晚期内体中的病毒体之间的构象,其中衣壳被释放。具体而言,其N-末端细胞结合结构域上的表位变得不可接近,而非N-末端表位被揭示,与报道的水泡性口炎病毒糖蛋白G的结构变化一致。内体酸化抑制剂阻断了gB构象转换。它们还阻断了衣壳释放和感染的建立,这意味着gB开关是进入的关键步骤。中和抗体只能部分抑制这种转换。他们需要参与一种不太脆弱的gB上游形式,因为它的融合形式仅在核内体中显示,这有助于解释为什么gB定向的MuHV-4中和如此困难。
Herpesviruses are ancient pathogens that infect all vertebrates. The most conserved component of their entry machinery is glycoprotein B (gB), yet how gB functions is unclear. A striking feature of the murid herpesvirus 4 (MuHV-4) gB is its resistance to neutralization. Here, we show by direct visualization of infected cells that the MuHV-4 gB changes its conformation between extracellular virions and those in late endosomes, where capsids are released. Specifically, epitopes on its N-terminal cell-binding domain become inaccessible, whilst non-N-terminal epitopes are revealed, consistent with structural changes reported for the vesicular stomatitis virus glycoprotein G. Inhibitors of endosomal acidification blocked the gB conformation switch. They also blocked capsid release and the establishment of infection, implying that the gB switch is a key step in entry. Neutralizing antibodies could only partially inhibit the switch. Their need to engage a less vulnerable, upstream form of gB, because its fusion form is revealed only in endosomes, helps to explain why gB-directed MuHV-4 neutralization is so difficult.
DOI: 10.1128/jvi.78.23.13370-13375.2004
发表时间: 2004-12-01
影响因子: 5.4
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发表时间: 2000-08-01
影响因子: 5.4
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