4HJI

Structure of the CooA pilin subunit from enterotoxigenic Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.224 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The Structure of the CS1 Pilus of Enterotoxigenic Escherichia coli Reveals Structural Polymorphism.

Galkin, V.E.Kolappan, S.Ng, D.Zong, Z.Li, J.Yu, X.Egelman, E.H.Craig, L.

(2013) J Bacteriol 195: 1360-1370

  • DOI: https://doi.org/10.1128/JB.01989-12
  • Primary Citation of Related Structures:  
    4HJI

  • PubMed Abstract: 

    Enterotoxigenic Escherichia coli (ETEC) is a bacterial pathogen that causes diarrhea in children and travelers in developing countries. ETEC adheres to host epithelial cells in the small intestine via a variety of different pili. The CS1 pilus is a prototype for a family of related pili, including the CFA/I pili, present on ETEC and other Gram-negative bacterial pathogens. These pili are assembled by an outer membrane usher protein that catalyzes subunit polymerization via donor strand complementation, in which the N terminus of each incoming pilin subunit fits into a hydrophobic groove in the terminal subunit, completing a β-sheet in the Ig fold. Here we determined a crystal structure of the CS1 major pilin subunit, CooA, to a 1.6-Å resolution. CooA is a globular protein with an Ig fold and is similar in structure to the CFA/I major pilin CfaB. We determined three distinct negative-stain electron microscopic reconstructions of the CS1 pilus and generated pseudoatomic-resolution pilus structures using the CooA crystal structure. CS1 pili adopt multiple structural states with differences in subunit orientations and packing. We propose that the structural perturbations are accommodated by flexibility in the N-terminal donor strand of CooA and by plasticity in interactions between exposed flexible loops on adjacent subunits. Our results suggest that CS1 and other pili of this class are extensible filaments that can be stretched in response to mechanical stress encountered during colonization.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Genetics, University of Virginia Medical Center, Charlottesville, VA, USA. galkin@virginia.edu


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CS1 fimbrial subunit A
A, B
175Escherichia coliMutation(s): 0 
Gene Names: csoAcooA
UniProt
Find proteins for P0ABW7 (Escherichia coli)
Explore P0ABW7 
Go to UniProtKB:  P0ABW7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ABW7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.224 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 29.99α = 83.72
b = 46.87β = 89.95
c = 51.27γ = 74.58
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-12-19
    Type: Initial release
  • Version 1.1: 2013-04-17
    Changes: Database references
  • Version 1.2: 2015-02-18
    Changes: Derived calculations
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description