2G7C

Clostridium difficile Toxin A Fragment Bound to aGal(1,3)bGal(1,4)bGlcNAc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Carbohydrate recognition by Clostridium difficile toxin A.

Greco, A.Ho, J.G.Lin, S.J.Palcic, M.M.Rupnik, M.Ng, K.K.

(2006) Nat Struct Mol Biol 13: 460-461

  • DOI: 10.1038/nsmb1084
  • Primary Citation of Related Structures:  
    2G7C

  • PubMed Abstract: 
  • Clostridium difficile TcdA is a large toxin that binds carbohydrates on intestinal epithelial cells. A 2-A resolution cocrystal structure reveals two molecules of alpha-Gal-(1,3)-beta-Gal-(1,4)-beta-GlcNAcO(CH(2))(8)CO(2)CH(3) binding in an extended conformation to TcdA ...

    Clostridium difficile TcdA is a large toxin that binds carbohydrates on intestinal epithelial cells. A 2-A resolution cocrystal structure reveals two molecules of alpha-Gal-(1,3)-beta-Gal-(1,4)-beta-GlcNAcO(CH(2))(8)CO(2)CH(3) binding in an extended conformation to TcdA. Residues forming key contacts with the trisaccharides are conserved in all seven putative binding sites in TcdA, suggesting a mode of multivalent binding that may be exploited for the rational design of novel therapeutics.


    Organizational Affiliation

    Alberta Ingenuity Centre for Carbohydrate Science, University of Calgary, Calgary, Canada T2N 1N4.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Toxin AA, B255Clostridioides difficileMutation(s): 0 
Gene Names: toxAtcdA
EC: 3.4.22 (UniProt), 2.4.1 (UniProt)
UniProt
Find proteins for P16154 (Clostridioides difficile)
Explore P16154 
Go to UniProtKB:  P16154
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16154
Protein Feature View
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-galactopyranose-(1-3)-beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseC, D, E, F 3N/A Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G03499BP
GlyCosmos:  G03499BP
GlyGen:  G03499BP
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.682α = 90
b = 132.825β = 100.29
c = 65.917γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
CNSrefinement

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-18
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary