1XOU

Crystal structure of the CesA-EspA complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural characterization of a type III secretion system filament protein in complex with its chaperone.

Yip, C.K.Finlay, B.B.Strynadka, N.C.J.

(2005) Nat.Struct.Mol.Biol. 12: 75-81

  • DOI: 10.1038/nsmb879

  • PubMed Abstract: 
  • The type III secretion system (TTSS) mediates the specific translocation of bacterial proteins into the cytoplasm of eukaryotic cells, a process essential for the virulence of many Gram-negative pathogens. The enteropathogenic Escherichia coli TTSS p ...

    The type III secretion system (TTSS) mediates the specific translocation of bacterial proteins into the cytoplasm of eukaryotic cells, a process essential for the virulence of many Gram-negative pathogens. The enteropathogenic Escherichia coli TTSS protein EspA forms a hollow extracellular filament believed to be a molecular conduit for type III protein translocation. Structural analysis of EspA has been hampered by its polymeric nature. We show that EspA alone is sufficient to form filamentous structures in the absence of other pathogenicity island-encoded proteins. CesA is the recently proposed chaperone of EspA, and we demonstrate that CesA traps EspA in a monomeric state and inhibits its polymerization. Crystallographic analysis of the heterodimeric CesA-EspA complex at a resolution of 2.8 A reveals that EspA contains two long a-helices, which are involved in extensive coiled-coil interactions with CesA.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of British Columbia, 2146 Health Sciences Mall, Vancouver, British Columbia, Canada V6T 1Z3.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EspA
A
192Escherichia coliMutation(s): 0 
Gene Names: espA
Find proteins for Q47184 (Escherichia coli)
Go to UniProtKB:  Q47184
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Z5138 gene product
B
95Escherichia coliMutation(s): 1 
Gene Names: cesAB (orf3)
Find proteins for O52124 (Escherichia coli)
Go to UniProtKB:  O52124
Small Molecules
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: 2.8 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.236 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 35.422α = 90.00
b = 72.383β = 90.00
c = 95.679γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
SOLVEphasing
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-12-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance