4FG0

Structure of the St. Louis Encephalitis Virus envelope protein in the fusogenic trimer conformation.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.899 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of the st. Louis encephalitis virus postfusion envelope trimer.

Luca, V.C.Nelson, C.A.Fremont, D.H.

(2013) J.Virol. 87: 818-828

  • DOI: 10.1128/JVI.01950-12

  • PubMed Abstract: 
  • St. Louis encephalitis virus (SLEV) is a mosquito-borne flavivirus responsible for several human encephalitis outbreaks over the last 80 years. Mature flavivirus virions are coated with dimeric envelope (E) proteins that mediate attachment and fusion ...

    St. Louis encephalitis virus (SLEV) is a mosquito-borne flavivirus responsible for several human encephalitis outbreaks over the last 80 years. Mature flavivirus virions are coated with dimeric envelope (E) proteins that mediate attachment and fusion with host cells. E is a class II fusion protein, the hallmark of which is a distinct dimer-to-trimer rearrangement that occurs upon endosomal acidification and insertion of hydrophobic fusion peptides into the endosomal membrane. Herein, we report the crystal structure of SLEV E in the posfusion trimer conformation. The structure revealed specific features that differentiate SLEV E from trimers of related flavi- and alphaviruses. SLEV E fusion loops have distinct intermediate spacing such that they are positioned further apart than previously observed in flaviviruses but closer together than Semliki Forest virus, an alphavirus. Domains II and III (DII and DIII) of SLEV E also adopt different angles relative to DI, which suggests that the DI-DII joint may accommodate spheroidal motions. However, trimer interfaces are well conserved among flaviviruses, so it is likely the differences observed represent structural features specific to SLEV function. Analysis of surface potentials revealed a basic platform underneath flavivirus fusion loops that may interact with the anionic lipid head groups found in membranes. Taken together, these results highlight variations in E structure and assembly that may direct virus-specific interactions with host determinants to influence pathogenesis.


    Organizational Affiliation

    Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Polyprotein
A
407St. louis encephalitis virus (strain MS1-7)Mutation(s): 0 
Find proteins for P09732 (St. louis encephalitis virus (strain MS1-7))
Go to UniProtKB:  P09732
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.899 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.222 
  • Space Group: I 2 3
Unit Cell:
Length (Å)Angle (°)
a = 177.485α = 90.00
b = 177.485β = 90.00
c = 177.485γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-3000data collection
DENZOdata reduction
PHASERphasing
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-27
    Type: Initial release
  • Version 1.1: 2012-12-12
    Type: Database references
  • Version 1.2: 2013-01-16
    Type: Database references
  • Version 1.3: 2017-11-15
    Type: Refinement description