Format

Send to

Choose Destination
J Gen Virol. 2008 Jun;89(Pt 6):1352-63. doi: 10.1099/vir.0.83519-0.

Glycoprotein B switches conformation during murid herpesvirus 4 entry.

Author information

1
Division of Virology, Department of Pathology, University of Cambridge, UK.

Abstract

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.

PMID:
18474550
PMCID:
PMC2886948
DOI:
10.1099/vir.0.83519-0
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Ingenta plc Icon for PubMed Central
Loading ...
Support Center