4G2K

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.1021/bi300976m

  • 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 ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
General control protein GCN4, Envelope glycoprotein GP2 chimera
A, B, C
125Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Lake Victoria marburgvirus (strain Popp-67)
This entity is chimeric
Mutation(s): 10 
Gene Names: GCN4 (AAS3, ARG9), GP
Find proteins for P03069 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P03069
Find proteins for P35254 (Lake Victoria marburgvirus (strain Popp-67))
Go to UniProtKB:  P35254
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, C
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 52.574α = 90.00
b = 147.529β = 90.00
c = 42.198γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
CBASSdata collection
SCALEPACKdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
DMphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-09-12
    Type: Initial release
  • Version 1.1: 2012-10-17
    Type: Database references
  • Version 1.2: 2017-07-26
    Type: Refinement description, Source and taxonomy