Crystal structure of the Marburg Virus GP2 ectodomain in its post-fusion conformation

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Crystal Structure of the Marburg Virus GP2 Core Domain in Its Postfusion Conformation.

Koellhoffer, J.F.Malashkevich, V.N.Harrison, J.S.Toro, R.Bhosle, R.C.Chandran, K.Almo, S.C.Lai, J.R.

(2012) Biochemistry 51: 7665-7675

  • DOI: https://doi.org/10.1021/bi300976m
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Marburg virus (MARV) and Ebola virus (EBOV) are members of the family Filoviridae ("filoviruses") and cause severe hemorrhagic fever with human case fatality rates of up to 90%. Filovirus infection requires fusion of the host cell and virus membranes, a process that is mediated by the envelope glycoprotein (GP). GP contains two subunits, the surface subunit (GP1), which is responsible for cell attachment, and the transmembrane subunit (GP2), which catalyzes membrane fusion. The GP2 ectodomain contains two heptad repeat regions, N-terminal and C-terminal (NHR and CHR, respectively), that adopt a six-helix bundle during the fusion process. The refolding of this six-helix bundle provides the thermodynamic driving force to overcome barriers associated with membrane fusion. Here we report the crystal structure of the MARV GP2 core domain in its postfusion (six-helix bundle) conformation at 1.9 Å resolution. The MARV GP2 core domain backbone conformation is virtually identical to that of EBOV GP2 (reported previously), and consists of a central NHR core trimeric coiled coil packed against peripheral CHR α-helices and an intervening loop and helix-turn-helix segments. We previously reported that the stability of the MARV GP2 postfusion structure is highly pH-dependent, with increasing stability at lower pH [Harrison, J. S., Koellhoffer, J. K., Chandran, K., and Lai, J. R. (2012) Biochemistry51, 2515-2525]. We hypothesized that this pH-dependent stability provides a mechanism for conformational control such that the postfusion six-helix bundle is promoted in the environments of appropriately mature endosomes. In this report, a structural rationale for this pH-dependent stability is described and involves a high-density array of core and surface acidic side chains at the midsection of the structure, termed the "anion stripe". In addition, many surface-exposed salt bridges likely contribute to the stabilization of the postfusion structure at low pH. These results provide structural insights into the mechanism of MARV GP2-mediated membrane fusion.

  • Organizational Affiliation

    Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
General control protein GCN4, Envelope glycoprotein GP2 chimera
A, B, C
125Saccharomyces cerevisiaeLake Victoria marburgvirus - Popp
This entity is chimeric
Mutation(s): 10 
Gene Names: GCN4GPGP2
Find proteins for P03069 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P03069 
Go to UniProtKB:  P03069
Find proteins for P35254 (Lake Victoria marburgvirus (strain Popp-67))
Explore P35254 
Go to UniProtKB:  P35254
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP03069P35254
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.574α = 90
b = 147.529β = 90
c = 42.198γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
CBASSdata collection
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-09-12
    Type: Initial release
  • Version 1.1: 2012-10-17
    Changes: Database references
  • Version 1.2: 2017-07-26
    Changes: Refinement description, Source and taxonomy
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description