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Influenza fusion peptides.

J J Skehel1, K Cross, D Steinhauer

  • 1Division of Virology, MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK. mbrenna@nimr.mrc.ac.uk

Biochemical Society Transactions
|August 11, 2001
PubMed
Summary

Viral fusion peptides, crucial for enveloped virus entry, change location and structure during activation. Specific residue changes in influenza hemagglutinin

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Enveloped viruses utilize viral fusion proteins for cell entry.
  • Fusion peptides are N-terminal regions of viral membrane fusion proteins.
  • These peptides are generated by precursor cleavage in viruses like influenza.

Purpose of the Study:

  • To investigate the structural dynamics of viral fusion peptides.
  • To determine the role of specific residues in membrane fusion activity.
  • To elucidate the structure of fusion peptides in their active state.

Main Methods:

  • Determined three-dimensional structures of influenza hemagglutinin (HA) in precursor, cleaved, and fusion-activated forms.
  • Analyzed mutant HAs with alterations in the fusion peptide sequence.
  • Correlated sequence changes with membrane-fusion activity.

Main Results:

  • Fusion peptides of influenza HA exhibit distinct positions and structures across different activation states.
  • Specific amino acid residues within the fusion peptide are critical for membrane-fusion activity.
  • A model for the fusion peptide structure in a fusion-active molecule was proposed.

Conclusions:

  • The conformational flexibility of viral fusion peptides is essential for their function.
  • Understanding fusion peptide structure-activity relationships can inform antiviral strategies.
  • This study provides insights into the molecular mechanisms of viral membrane fusion.

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