Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 23.25 kDa 
• Atom Count: 1642 
• Residue Count: 183 
• Unique protein chains: 1

2VRZ

Structural analysis of homodimeric staphylococcal aureus EsxA

• DOI: 10.2210/pdb2VRZ/pdb

• Classification: CELL INVASION
• Organism(s): Staphylococcus aureus
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2008-04-17 Released: 2008-08-26 
• Deposition Author(s): Sundaramoorthy, R., Hunter, W.N.

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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 

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

• PubMed: 18773907 
• DOI: 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
VIRULENCE FACTOR ESXA	A, B	99	Staphylococcus aureus	Mutation(s): 0
Find proteins for Q99WU4 (Staphylococcus aureus (strain Mu50 / ATCC 700699)) Explore Q99WU4  Go to UniProtKB:  Q99WU4

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	A, B	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A,B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

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 = 46.232	α = 90
b = 27.636	β = 105.43
c = 64.394	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-04-17 
• Released Date: 2008-08-26 
Deposition Author(s): Sundaramoorthy, R., Hunter, W.N.

Revision History 

• 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