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J. Cell Biol., Volume 142, Number 3, August 10, 1998 847-857

alpha -Catenin-Vinculin Interaction Functions to Organize the Apical Junctional Complex in Epithelial Cells

Mitsuko Watabe-Uchida,* Naoshige Uchida,* Yuzo Imamura,Dagger Akira Nagafuchi,Dagger Kazushi Fujimoto,§ Tadashi Uemura,* Stefan Vermeulen,parallel Frans van Roy, Eileen D. Adamson,** and Masatoshi Takeichi*

* Department of Biophysics, Faculty of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502; Dagger  Department of Cell Biology and § Department of Anatomy, Faculty of Medicine, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8507, Japan; parallel  University Hospital of Ghent and  Department of Molecular Biology, VIB-University of Ghent, B-9000 Ghent, Belgium; and ** The Burnham Institute, La Jolla, California

alpha E-catenin, a cadherin-associated protein, is required for tight junction (TJ) organization, but its role is poorly understood. We transfected an alpha E-catenin-deficient colon carcinoma line with a series of alpha E-catenin mutant constructs. The results showed that the amino acid 326-509 domain of this catenin was required to organize TJs, and its COOH-terminal domain was not essential for this process. The 326-509 internal domain was found to bind vinculin. When an NH2-terminal alpha E-catenin fragment, which is by itself unable to organize the TJ, was fused with the vinculin tail, this chimeric molecule could induce TJ assembly in the alpha E-catenin-deficient cells. In vinculin-null F9 cells, their apical junctional organization was impaired, and this phenotype was rescued by reexpression of vinculin. These results indicate that the alpha E-catenin-vinculin interaction plays a role in the assembly of the apical junctional complex in epithelia.

Key words: cadherincatenintight junctionvinculinzonula adherens


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