1XTC

CHOLERA TOXIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The three-dimensional crystal structure of cholera toxin.

Zhang, R.G.Scott, D.L.Westbrook, M.L.Nance, S.Spangler, B.D.Shipley, G.G.Westbrook, E.M.

(1995) J.Mol.Biol. 251: 563-573

  • DOI: 10.1006/jmbi.1995.0456

  • PubMed Abstract: 
  • The clinical manifestations of cholera are largely attributable to the actions of a secreted hexameric AB5 enterotoxin (choleragen). We have independently solved and refined the three-dimensional structure of choleragen at 2.5 A resolution. The struc ...

    The clinical manifestations of cholera are largely attributable to the actions of a secreted hexameric AB5 enterotoxin (choleragen). We have independently solved and refined the three-dimensional structure of choleragen at 2.5 A resolution. The structure of the crystalline toxin closely resembles that described for the heat-labile enterotoxin from Escherichia coli (LT) with which it shares 80% sequence homology. In both cases, the wedge-shaped A subunit is loosely held high above the plane of the pentameric B subunits by the tethering A2 chain. The most striking difference between the two toxins occurs at the carboxyl terminus of the A2 chain. Whereas the last 14 residues of the A2 chain of LT threading through the central pore of the B5 assembly form an extended chain with a terminal loop, the A2 chain of choleragen remains a nearly continuous alpha-helix throughout its length. The four carboxyl-terminal residues of the A2 chain (KDEL sequence), disordered in the crystal structure of LT, are clearly visible in choleragen's electron-density map. In the accompanying article we describe the three-dimensional structure of the isolated B pentamer of cholera toxin (choleragenoid). Comparison of the crystalline coordinates of choleragen, choleragenoid, and LT provides a solid three-dimensional foundation for further experimental investigation. These structures, along with those of related toxins from Shigella dysenteria and Bordetella pertussis, offer a first step towards the rational design of new vaccines and anti-microbial agents.


    Related Citations: 
    • The 2.4 A Crystal Structure of Cholera Toxin B Subunit Pentamer: Choleragenoid
      Zhang, R.G.,Westbrook, M.L.,Westbrook, E.M.,Scott, D.L.,Otwinowski, Z.,Maulik, P.R.,Reed, R.A.,Shipley, G.G.
      (1995) J.Mol.Biol. 251: 550


    Organizational Affiliation

    Center for Mechanistic Biology and Biotechnology, Argonne National Laboratory, IL 60439, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHOLERA TOXIN
A
194Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)Mutation(s): 0 
Gene Names: ctxA (toxA)
Find proteins for P01555 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Go to UniProtKB:  P01555
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CHOLERA TOXIN
C
46Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)Mutation(s): 0 
Gene Names: ctxA (toxA)
Find proteins for P01555 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Go to UniProtKB:  P01555
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
CHOLERA TOXIN
D, E, F, G, H
103Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)Mutation(s): 0 
Gene Names: ctxB (toxB)
Find proteins for P01556 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Go to UniProtKB:  P01556
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 73.000α = 90.00
b = 92.200β = 106.40
c = 60.600γ = 90.00
Software Package:
Software NamePurpose
PROFFTrefinement
XENGENdata reduction
X-PLORrefinement
XENGENdata collection
X-PLORphasing
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-08-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance