Cited by 161Influenza Virus Research StudiesCellular transport and secretionVirology and Viral Diseases

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Structural transitions in influenza haemagglutinin at membrane fusion pH

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Benton, Donald J., Gamblin, Steven J., Rosenthal, Peter B., Skehel, John J.·2020·Nature

Abstract

Infection by enveloped viruses involves fusion of their lipid envelopes with cellular membranes to release the viral genome into cells. For HIV, Ebola, influenza and numerous other viruses, envelope glycoproteins bind the infecting virion to cell-surface receptors and mediate membrane fusion. In the case of influenza, the receptor-binding glycoprotein is the haemagglutinin (HA), and following receptor-mediated uptake of the bound virus by endocytosis 1, it is the HA that mediates fusion of the virus envelope with the membrane of the endosome 2. Each subunit of the trimeric HA consists of two disulfide-linked polypeptides, HA1 and HA2. The larger, virus-membrane-distal, HA1 mediates receptor binding; the smaller, membrane-proximal, HA2 anchors HA in the envelope and contains the fusion peptide, a region that is directly involved in membrane interaction 3. The low pH of endosomes activates fusion by facilitating irreversible conformational changes in the glycoprotein. The structures of the initial HA at neutral pH and the final HA at fusion pH have been investigated by electron microscopy 4,5 and X-ray crystallography 6-8. Here, to further study the process of fusion, we incubate HA for different times at pH 5.0 and directly image structural changes using single-particle cryo-electron microscopy. We describe three distinct, previously undescribed forms of HA, most notably a 150 Å-long triple-helical coil of HA2, which may bridge between the viral and endosomal membranes. Comparison of these structures reveals concerted conformational rearrangements through which the HA mediates membrane fusion.

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Metadata

Authors
Benton, D. J., Gamblin, S. J., Rosenthal, P. B., & Skehel, J. J.
Affiliations
The Francis Crick Institute (GB)
Corresponding author
  • Benton, Donald J.
  • Rosenthal, Peter B.
Venue
Nature
Published
2020-05-27
Volume
583
Issue
7814
Pages
150-153
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W3028703248
Cited by
161
References
38
Citations by year
2026: 31 · 2025: 26 · 2024: 29 · 2023: 24 · 2022: 19 · 2021: 23 · 2020: 9
FWCI
13.45
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Wellcome Trust (FC001078, FC001143)
  • Francis Crick Institute (10078, 10143)
  • Cancer Research UK (FC001143, FC001078)
Topics
  • Health Sciences › Medicine › Epidemiology › Influenza Virus Research Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Epidemiology › Virology and Viral Diseases
Keywords
influenza haemagglutinin, membrane fusion, low pH, endosomal membrane fusion, conformational change, fusion peptide, viral envelope glycoprotein, structural intermediates, receptor-mediated endocytosis
MeSH terms
Hydrogen-Ion Concentration, Membrane Fusion, Models, Molecular, Protein Conformation, Endosomes, Time Factors, Hemagglutinin Glycoproteins, Influenza Virus, Cryoelectron Microscopy, Influenza A Virus, H3N2 Subtype

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