2VS0

Structural analysis of homodimeric staphylococcal aureus virulence factor EsxA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of Staphylococcus Aureus Esxa Suggests a Contribution to Virulence by Action as a Transport Chaperone and/or Adaptor Protein.

Sundaramoorthy, R.Fyfe, P.K.Hunter, W.N.

(2008) J.Mol.Biol. 383: 603

  • DOI: 10.1016/j.jmb.2008.08.047
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Staphylococcus aureus pathogenesis depends on a specialized protein secretion system (ESX-1) that delivers a range of virulence factors to assist infectivity. We report the characterization of two such factors, EsxA and EsxB, small acidic dimeric pro ...

    Staphylococcus aureus pathogenesis depends on a specialized protein secretion system (ESX-1) that delivers a range of virulence factors to assist infectivity. We report the characterization of two such factors, EsxA and EsxB, small acidic dimeric proteins carrying a distinctive WXG motif. EsxA crystallized in triclinic and monoclinic forms and high-resolution structures were determined. The asymmetric unit of each crystal form is a dimer. The EsxA subunit forms an elongated cylindrical structure created from side-by-side alpha-helices linked with a hairpin bend formed by the WXG motif. Approximately 25% of the solvent accessible surface area of each subunit is involved in interactions, predominantly hydrophobic, with the partner subunit. Secondary-structure predictions suggest that EsxB displays a similar structure. The WXG motif helps to create a shallow cleft at each end of the dimer, forming a short beta-sheet-like feature with an N-terminal segment of the partner subunit. Structural and sequence comparisons, exploiting biological data on related proteins found in Mycobacterium tuberculosis, suggest that this family of proteins may contribute to pathogenesis by transporting protein cargo through the ESX-1 system exploiting a C-terminal secretion signal and/or are capable of acting as adaptor proteins to facilitate interactions with host receptor proteins.


    Organizational Affiliation

    Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
VIRULENCE FACTOR ESXA
A, B
97Staphylococcus aureus (strain Mu50 / ATCC 700699)Mutation(s): 0 
Gene Names: esxA
Find proteins for Q99WU4 (Staphylococcus aureus (strain Mu50 / ATCC 700699))
Go to UniProtKB:  Q99WU4
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CAC
Query on CAC

Download SDF File 
Download CCD File 
B
CACODYLATE ION
dimethylarsinate
C2 H6 As O2
OGGXGZAMXPVRFZ-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.166 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 25.773α = 67.41
b = 39.069β = 84.51
c = 43.029γ = 88.76
Software Package:
Software NamePurpose
SCALAdata scaling
MOSFLMdata reduction
REFMACrefinement
SHELXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-08-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance