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FEBS Lett. 2000 Jul 7;476(3):258-61.

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

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Department of Cell Biology, Kyoto University, Kyoto, Japan.


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 1.0x10(8) M(-1). We concluded that the second extracellular loop is the site through which claudin-3 interacts with CPE on the cell surface.

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