Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Cyclic - C5  (3D View)
Global Stoichiometry: Homo 5-mer - A5 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 57.91 kDa 
• Atom Count: 4115 
• Modelled Residue Count: 515 
• Deposited Residue Count: 515 
• Unique protein chains: 1

1CHQ

SURPRISING LEADS FOR A CHOLERA TOXIN RECEPTOR BINDING ANTAGONIST; CRYSTALLOGRAPHIC STUDIES OF CTB MUTANTS

• PDB DOI: 10.2210/pdb1CHQ/pdb

• Classification: TOXIN
• Organism(s): Vibrio cholerae
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1995-02-15 Released: 1996-03-08 
• Deposition Author(s): Merritt, E.A., Hol, W.G.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Work: 0.208 

Literature

Surprising leads for a cholera toxin receptor-binding antagonist: crystallographic studies of CTB mutants.

Merritt, E.A., Sarfaty, S., Chang, T.T., Palmer, L.M., Jobling, M.G., Holmes, R.K., Hol, W.G.

(1995) Structure 3: 561-570

• PubMed: 8590017 
• DOI: 10.1016/s0969-2126(01)00190-3
• Primary Citation of Related Structures:  
  1CHP, 1CHQ


• PubMed Abstract: 
  

Because agents which inhibit the receptor binding of cholera toxin constitute possible lead compounds for the structure-based design of anti-cholera drugs, detailed investigation of the toxin's receptor-binding site is of key importance. The substitution Gly-->Asp at residue 33 of the cholera toxin B subunit (CTB) has been reported to abolish receptor-binding ability. The substitution Arg35-->Asp has been reported to result in deficient assembly of the AB5 holotoxin. The molecular basis for these effects was not readily apparent from analysis of an earlier crystal structure of the wild-type toxin B pentamer in a complex with the receptor pentasaccharide.

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Related Citations: 

• 2.2 Angstroms Crystal Structure of Cholera Toxin B5 Pentamer Bound to Receptor GM1 Pentasaccharide
  Merritt, E.A., Sarfaty, S., Van Den Akker, F., L'Hoir, C., Martial, J.A., Hol, W.G.J.
  (1994) Protein Sci 3: 166

• Analysis of Structure and Function of the B Subunit of Cholera Toxin by the Use of Site-Directed Mutagenesis
  Jobling, M.G., Holmes, R.K.
  (1991) Mol Microbiol 5: 1755

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Organizational Affiliation: 

Department of Biological Structure, University of Washington, Seattle 98195, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CHOLERA TOXIN B PENTAMER	A [auth D], B [auth E], C [auth F], D [auth G], E [auth H]	103	Vibrio cholerae	Mutation(s): 1
UniProt
Find proteins for P01556 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)) Explore P01556  Go to UniProtKB:  P01556

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Work: 0.208 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 102.6	α = 90
b = 67.39	β = 131.63
c = 98.81	γ = 90

Software Package:

Software Name	Purpose
XENGEN	data collection
X-PLOR	model building
X-PLOR	refinement
XENGEN	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-02-15 
• Released Date: 1996-03-08 
Deposition Author(s): Merritt, E.A., Hol, W.G.J.

Revision History  

• Version 1.0: 1996-03-08
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2014-02-12
  Changes: Refinement description
• Version 1.4: 2017-06-21
  Changes: Refinement description
• Version 1.5: 2021-11-03
  Changes: Database references, Other