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J. Cell Biol.,
Volume 142, Number 3, August 10, 1998 847-857
-Catenin-Vinculin Interaction Functions to Organize
the Apical Junctional Complex in Epithelial Cells



* Department of Biophysics, Faculty of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502;
Department of
Cell Biology and § Department of Anatomy, Faculty of Medicine, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8507, Japan;
University Hospital of Ghent and ¶ Department of Molecular Biology, VIB-University of Ghent, B-9000 Ghent, Belgium; and ** The Burnham Institute, La Jolla, California
E-catenin, a cadherin-associated protein, is
required for tight junction (TJ) organization, but its
role is poorly understood. We transfected an
E-catenin-deficient colon carcinoma line with a series of
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
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
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
E-catenin-vinculin interaction plays a role in the assembly of the apical junctional complex in epithelia.
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