2VRZ

Structural analysis of homodimeric staphylococcal aureus EsxA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 

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: https://doi.org/10.1016/j.jmb.2008.08.047
  • Primary Citation of Related Structures:  
    2VRZ, 2VS0

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
VIRULENCE FACTOR ESXA
A, B
99Staphylococcus aureusMutation(s): 0 
UniProt
Find proteins for Q99WU4 (Staphylococcus aureus (strain Mu50 / ATCC 700699))
Explore Q99WU4 
Go to UniProtKB:  Q99WU4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99WU4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.232α = 90
b = 27.636β = 105.43
c = 64.394γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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