4G7X

Crystal structure of a complex between the CTXphi pIII N-terminal domain and the Vibrio cholerae TolA C-terminal domain

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.44 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 

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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:  
    4G7W, 4G7X

  • 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 the filamentous bacteriophage, CTXϕ, that integrates as a prophage into the V ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Putative uncharacterized proteinA105Vibrio cholerae CIRS101Mutation(s): 0 
Gene Names: orfU, VCH_002198
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Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TolA proteinB138Vibrio cholerae O395Mutation(s): 0 
Gene Names: tolA, VC0395_A1430, VC395_1952
UniProt
Find proteins for A0A0H3AIH3 (Vibrio cholerae serotype O1 (strain ATCC 39541 / Classical Ogawa 395 / O395))
Explore A0A0H3AIH3 
Go to UniProtKB:  A0A0H3AIH3
Entity Groups  
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UniProt GroupA0A0H3AIH3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.44 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.38α = 90
b = 46.16β = 90
c = 101.63γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

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