ISDA: 2G7C

Deposition Date 2006-02-28

Release Date 2006-04-18

Last Version Date 2023-09-20

Entry Detail

PDB ID:

2G7C

Keywords:

TOXIN

Title:

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

Biological Source:

Source Organism:

Clostridium difficile (Taxon ID: 1496)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.00 Å

R-Value Free:

0.23

R-Value Work:

0.19

R-Value Observed:

0.19

Space Group:

P 1 21 1

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Toxin A
Gene (Uniprot):tcdA
Chain IDs:A, B
Chain Length:255
Number of Molecules:2
Biological Source:Clostridium difficile

UniProt ID:P16154 Pfam ID:PF01473, PF19127 EC:2.4.1.B62

Ligand Molecules

GOL

Primary Citation

Carbohydrate recognition by Clostridium difficile toxin A.

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

Nat.Struct.Mol.Biol. 13 460 461 (2006)

PMID: 16622409 DOI: 10.1038/nsmb1084

Abstact

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.

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