1FGB

TOXIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 550-562

  • DOI: 10.1006/jmbi.1995.0455

  • PubMed Abstract: 
  • Cholera toxin, a heterohexameric AB5 enterotoxin released by Vibrio cholera, induces a profuse secretory diarrhea in susceptible hosts. Choleragenoid, the B subunit pentamer of cholera toxin, directs the enzymatic A subunit to its target by binding t ...

    Cholera toxin, a heterohexameric AB5 enterotoxin released by Vibrio cholera, induces a profuse secretory diarrhea in susceptible hosts. Choleragenoid, the B subunit pentamer of cholera toxin, directs the enzymatic A subunit to its target by binding the GM1 gangliosides exposed on the luminal surface of intestinal epithelial cells. The crystal structure of choleragenoid has been independently solved and refined at 2.4 A resolution by combining single isomorphous replacement with non-crystallographic symmetry averaging. The structure of the B subunits, and their pentameric arrangement, closely resembles that reported for the intact holotoxin, choleragen, the heat-labile enterotoxin from Escherichia coli, and for a choleragenoid-GM1 pentasaccharide complex. In the absence of the A subunit the central cavity of the B pentamer is a highly solvated channel. The binding of choleragenoid to the A subunit or to its receptor pentasaccharide modestly affects the local stereochemistry without perceptibly altering the subunit interface.


    Related Citations: 
    • 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


    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 B SUBUNIT PENTAMER
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: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 39.100α = 90.00
b = 94.500β = 96.10
c = 67.600γ = 90.00
Software Package:
Software NamePurpose
PROFFTrefinement
X-PLORphasing
XENGENdata collection
X-PLORrefinement
XENGENdata reduction
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-12-23
    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