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 

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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 U S A 109: 19994-19999

  • DOI: 10.1073/pnas.1213801109
  • Primary Citation of Related Structures:  
    2LWA

  • 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 structure, stabilized by aliphatic hydrogen bonding and charge-dipole interactions ...

    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
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HEMAGGLUTININ FUSION PEPTIDE G8A MUTANTA, B, C30Influenza A virus (A/Hong Kong/1035/1998(H1N1))Mutation(s): 1 
Gene Names: HA
UniProt
Find proteins for Q91IJ0 (Influenza A virus)
Explore Q91IJ0 
Go to UniProtKB:  Q91IJ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ91IJ0
Protein Feature View
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  • Reference Sequence
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

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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