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Original Article |
Correspondence to: Yoshimi Takai, Department of Molecular Biology and Biochemistry, Osaka University Graduate School of Medicine/Faculty of Medicine, Suita 565-0871, Osaka, Japan. Tel:81-6-6879-3410 Fax:81-6-6879-3419 E-mail:ytakai{at}molbio.med.osaka-u.ac.
We have found a new cellcell adhesion system at cadherin-based cellcell adherens junctions (AJs) consisting of at least nectin and l-afadin. Nectin is a Ca2+-independent homophilic immunoglobulin-like adhesion molecule, and l-afadin is an actin filament-binding protein that connects the cytoplasmic region of nectin to the actin cytoskeleton. Both the trans-interaction of nectin and the interaction of nectin with l-afadin are necessary for their colocalization with E-cadherin and catenins at AJs. Here, we examined the mechanism of interaction between these two cellcell adhesion systems at AJs by the use of
-catenindeficient F9 cell lines and cadherin-deficient L cell lines stably expressing their various components. We showed here that nectin and E-cadherin were colocalized through l-afadin and the COOH-terminal half of
-catenin at AJs. Nectin trans-interacted independently of E-cadherin, and the complex of E-cadherin and
- and ß-catenins was recruited to nectin-based cellcell adhesion sites through l-afadin without the trans-interaction of E-cadherin. Our results indicate that nectin and cadherin interact through their cytoplasmic domainassociated proteins and suggest that these two cellcell adhesion systems cooperatively organize cellcell AJs.
Key Words: immunoglobulin superfamily, afadin, ponsin, catenin, cellcell adherens junctions
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