Distribution of surface glycoproteins on influenza A virus determined by electron cryotomography.

Distribution of surface glycoproteins on influenza A virus determined by electron cryotomography.
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DOI:
10.1016/j.vaccine.2012.09.082
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发表时间:
2012-12-07
期刊:
影响因子:
5.5
通讯作者:
Rosenthal, Peter B.
Rosenthal, Peter B.
中科院分区:
医学3区
文献类型:
--
作者:
Wasilewski, Sebastian;Calder, Lesley J.;Grant, Tim;Rosenthal, Peter B.

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► Cryotomography of influenza A virus reveals a polarized structure. ► 3D models for the virus envelope are built using glycoprotein X-ray structures. ► Inter-glycoprotein distances and fractional surface volumes are calculated. ► Accessibility of the HA stem domain to neutralizing antibodies is assessed. ► Viral membrane curvature may constrain interaction with a surface of receptors. We use electron cryotomography to reconstruct virions of two influenza A H3N2 virus strains. The maps reveal the structure of the viral envelope containing hemagglutinin (HA) and neuraminidase (NA) glycoproteins and the virus interior containing a matrix layer and an assembly of ribonucleoprotein particles (RNPs) that package the genome. We build a structural model for the viral surface by locating copies of the X-ray structure of the HA ectodomain into density peaks on the virus surface. We calculate inter-glycoprotein distances and the fractional volume occupied by glycoproteins. The models suggest that for typical HA densities on virus, Fabs can bind to epitopes on the HA stem domain. The models also show how membrane curvature may influence the number of glycoproteins that can simultaneously interact with a target surface of receptors.
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发表时间: 2010-06-08
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