4G7W

Crystal structure of the N-terminal domain of the minor coat protein pIII from CTXphi


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structures of a CTX{varphi} pIII Domain Unbound and in Complex with a Vibrio cholerae TolA Domain Reveal Novel Interaction Interfaces.

Ford, C.G.Kolappan, S.Phan, H.T.Waldor, M.K.Winther-Larsen, H.C.Craig, L.

(2012) J.Biol.Chem. 287: 36258-36272

  • DOI: 10.1074/jbc.M112.403386
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Vibrio cholerae colonize the small intestine where they secrete cholera toxin, an ADP-ribosylating enzyme that is responsible for the voluminous diarrhea characteristic of cholera disease. The genes encoding cholera toxin are located on the genome of ...

    Vibrio cholerae colonize the small intestine where they secrete cholera toxin, an ADP-ribosylating enzyme that is responsible for the voluminous diarrhea characteristic of cholera disease. The genes encoding cholera toxin are located on the genome of the filamentous bacteriophage, CTXϕ, that integrates as a prophage into the V. cholerae chromosome. CTXϕ infection of V. cholerae requires the toxin-coregulated pilus and the periplasmic protein TolA. This infection process parallels that of Escherichia coli infection by the Ff family of filamentous coliphage. Here we demonstrate a direct interaction between the N-terminal domain of the CTXϕ minor coat protein pIII (pIII-N1) and the C-terminal domain of TolA (TolA-C) and present x-ray crystal structures of pIII-N1 alone and in complex with TolA-C. The structures of CTXϕ pIII-N1 and V. cholerae TolA-C are similar to coliphage pIII-N1 and E. coli TolA-C, respectively, yet these proteins bind via a distinct interface that in E. coli TolA corresponds to a colicin binding site. Our data suggest that the TolA binding site on pIII-N1 of CTXϕ is accessible in the native pIII protein. This contrasts with the Ff family phage, where the TolA binding site on pIII is blocked and requires a pilus-induced unfolding event to become exposed. We propose that CTXϕ pIII accesses the periplasmic TolA through retraction of toxin-coregulated pilus, which brings the phage through the outer membrane pilus secretin channel. These data help to explain the process by which CTXϕ converts a harmless marine microbe into a deadly human pathogen.


    Organizational Affiliation

    Department of Molecular Biology and Biochemistry Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative uncharacterized protein
A, B, C
160N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.232 
  • Space Group: P 63 2 2
Unit Cell:
Length (Å)Angle (°)
a = 126.250α = 90.00
b = 126.250β = 90.00
c = 128.270γ = 120.00
Software Package:
Software NamePurpose
SOLVEphasing
REFMACrefinement
XDSdata reduction
Blu-Icedata collection
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-08-29
    Type: Initial release
  • Version 1.1: 2012-09-19
    Type: Database references
  • Version 1.2: 2012-11-07
    Type: Database references