4P5H image
Entry Detail
PDB ID:
4P5H
Title:
Structure of Clostridium perfringens Enterotoxin with a peptide derived from a modified version of ECL-2 of Claudin 2
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2014-03-17
Release Date:
2014-07-16
Method Details:
Experimental Method:
Resolution:
3.38 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Claudin-2
Mutations:S149N, S155A
Chain IDs:A (auth: 1), B (auth: 2), C (auth: 3), D (auth: 4), T (auth: P), U (auth: Q), V (auth: R), W (auth: S), X (auth: T), Y (auth: U), Z (auth: V), AA (auth: W), BA (auth: X), CA (auth: Y), DA (auth: Z)
Chain Length:20
Number of Molecules:15
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Heat-labile enterotoxin B chain
Chain IDs:E (auth: A), F (auth: B), G (auth: C), H (auth: D), I (auth: E), J (auth: F), K (auth: G), L (auth: H), M (auth: I), N (auth: J), O (auth: K), P (auth: L), Q (auth: M), R (auth: N), S (auth: O)
Chain Length:286
Number of Molecules:15
Biological Source:Clostridium perfringens
Ligand Molecules
Primary Citation
Structure of a C. perfringens Enterotoxin Mutant in Complex with a Modified Claudin-2 Extracellular Loop 2.
J.Mol.Biol. 426 3134 3147 (2014)
PMID: 25020226 DOI: 10.1016/j.jmb.2014.07.001

Abstact

CPE (Clostridium perfringens enterotoxin) is the major virulence determinant for C. perfringens type-A food poisoning, the second most common bacterial food-borne illness in the UK and USA. After binding to its receptors, which include particular human claudins, the toxin forms pores in the cell membrane. The mature pore apparently contains a hexamer of CPE, claudin and, possibly, occludin. The combination of high binding specificity with cytotoxicity has resulted in CPE being investigated, with some success, as a targeted cytotoxic agent for oncotherapy. In this paper, we present the X-ray crystallographic structure of CPE in complex with a peptide derived from extracellular loop 2 of a modified, CPE-binding Claudin-2, together with high-resolution native and pore-formation mutant structures. Our structure provides the first atomic-resolution data on any part of a claudin molecule and reveals that claudin's CPE-binding fingerprint (NPLVP) is in a tight turn conformation and binds, as expected, in CPE's C-terminal claudin-binding groove. The leucine and valine residues insert into the binding groove while the first residue, asparagine, tethers the peptide via an interaction with CPE's aspartate 225 and the two prolines are required to maintain the tight turn conformation. Understanding the structural basis of the contribution these residues make to binding will aid in engineering CPE to target tumor cells.

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