2LWA

Conformational ensemble for the G8A mutant of the influenza hemagglutinin fusion peptide


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 480 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

pH-triggered, activated-state conformations of the influenza hemagglutinin fusion peptide revealed by NMR.

Lorieau, J.L.Louis, J.M.Schwieters, C.D.Bax, A.

(2012) Proc.Natl.Acad.Sci.USA 109: 19994-19999

  • DOI: 10.1073/pnas.1213801109

  • PubMed Abstract: 
  • The highly conserved first 23 residues of the influenza hemagglutinin HA2 subunit constitute the fusion domain, which plays a pivotal role in fusing viral and host-cell membranes. At neutral pH, this peptide adopts a tight helical hairpin wedge struc ...

    The highly conserved first 23 residues of the influenza hemagglutinin HA2 subunit constitute the fusion domain, which plays a pivotal role in fusing viral and host-cell membranes. At neutral pH, this peptide adopts a tight helical hairpin wedge structure, stabilized by aliphatic hydrogen bonding and charge-dipole interactions. We demonstrate that at low pH, where the fusion process is triggered, the native peptide transiently visits activated states that are very similar to those sampled by a G8A mutant. This mutant retains a small fraction of helical hairpin conformation, in rapid equilibrium with at least two open structures. The exchange rate between the closed and open conformations of the wild-type fusion peptide is ~40 kHz, with a total open-state population of ~20%. Transitions to these activated states are likely to play a crucial role in formation of the fusion pore, an essential structure required in the final stage of membrane fusion.


    Organizational Affiliation

    Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEMAGGLUTININ FUSION PEPTIDE G8A MUTANT
A, B, C
30Influenza A virusMutation(s): 1 
Gene Names: HA
Find proteins for Q91IJ0 (Influenza A virus)
Go to UniProtKB:  Q91IJ0
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 480 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2LWA Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-12-05
    Type: Initial release
  • Version 1.1: 2012-12-19
    Type: Database references
  • Version 1.2: 2013-02-20
    Type: Refinement description