NMR Structure of the Complete Internal Fusion Loop mutant I544A from Ebolavirus GP2 at pH 5.5

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Ebolavirus Entry Requires a Compact Hydrophobic Fist at the Tip of the Fusion Loop.

Gregory, S.M.Larsson, P.Nelson, E.A.Kasson, P.M.White, J.M.Tamm, L.K.

(2014) J Virol 88: 6636-6649

  • DOI: https://doi.org/10.1128/JVI.00396-14
  • Primary Citation of Related Structures:  
    2M5F, 2MB1

  • PubMed Abstract: 

    Ebolavirus is an enveloped virus causing severe hemorrhagic fever. Its surface glycoproteins undergo proteolytic cleavage and rearrangements to permit membrane fusion and cell entry. Here we focus on the glycoprotein's internal fusion loop (FL), critical for low-pH-triggered fusion in the endosome. Alanine mutations at L529 and I544 and particularly the L529 I544 double mutation compromised viral entry and fusion. The nuclear magnetic resonance (NMR) structures of the I544A and L529A I544A mutants in lipid environments showed significant disruption of a three-residue scaffold that is required for the formation of a consolidated fusogenic hydrophobic surface at the tip of the FL. Biophysical experiments and molecular simulation revealed the position of the wild-type (WT) FL in membranes and showed the inability of the inactive double mutant to reach this position. Consolidation of hydrophobic residues at the tip of FLs may be a common requirement for internal FLs of class I, II, and III fusion proteins.

  • Organizational Affiliation

    Center for Membrane Biology and Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Virion spike glycoprotein54Zaire ebolavirusMutation(s): 1 
Gene Names: GP
Membrane Entity: Yes 
Find proteins for L7QI57 (Zaire ebolavirus)
Explore L7QI57 
Go to UniProtKB:  L7QI57
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupL7QI57
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-09
    Type: Initial release
  • Version 1.1: 2014-05-07
    Changes: Database references
  • Version 1.2: 2014-06-04
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 1.4: 2023-12-27
    Changes: Data collection, Derived calculations