Clostridium perfringens enterotoxin binds to the second extracellular loop of claudin-3, a tight junction integral membrane protein

Claudins (claudin-1 to -18) with four transmembrane domains and two extracellular loops constitute tight junction strands. The peptide toxin Clostridium perfringens enterotoxin (CPE) has been shown to bind to claudin-3 and -4, but not to claudin-1 or -2, We constructed claudin-1/claudin-3 chimeric molecules and found that the second extracellular loop of claudin-3 conferred CPE sensitivity on L fibroblasts, Furthermore, overlay analyses revealed that the second extracellular loop of claudin-3 specifically bound to CPE at the K-a value of 1.0 X 10(8) M-1. We concluded that the second extracellular loop is the site through which claudin-3 interacts with CPE on the cell surface. (C) 2000 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.