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Originally published In Press as doi:10.1074/jbc.M002450200 on July 7, 2000

J. Biol. Chem., Vol. 275, Issue 38, 29816-29822, September 22, 2000
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The Coiled-coil Domain of Occludin Can Act to Organize Structural and Functional Elements of the Epithelial Tight Junction*

Asma NusratDagger , Jason A. ChenDagger , Chris S. FoleyDagger , Tony W. Liang§, Jeffrey Tom, M. Cromwell||, Cliff Quan, and Randall J. Mrsny||**

From the Dagger  Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia 30322 and the Departments of § Immunology,  Bioorganic Chemistry, and || Pharmaceutical Research and Development, Genentech, Inc., South San Francisco, California 94080

Occludin is an integral membrane protein that has been suggested to play a role in the organization and dynamic function of the epithelial tight junction (TJ). A number of other proteins have also been described to localize to the TJ. We have used a novel bait peptide method to investigate potential protein-protein interactions of the putative coiled-coil domain of occludin with some of these other TJ proteins. A 27-amino acid peptide of the human occludin sequence was synthesized, biotinylated at the N terminus, and modified to contain a photoactive moiety at either its hydrophobic or hydrophilic surface. These bait peptides were alpha -helical in solution, characteristic of coiled-coil structures. Photoactivation studies in the presence and absence of control peptides were used to assess the potential interactions in polarized sheets of a human intestinal cell line T84. Although a large number of proteins associated with the TJ or that are known to be involved in regulatory events of epithelial cells failed to be specifically labeled, occludin itself, ZO-1, protein kinase C-zeta , c-Yes, the regulatory subunit of phosphatidylinositol 3-kinase, and the gap junction component connexin 26 were specifically labeled. Our data demonstrate the potential of one specific domain of occludin, contained within 27 amino acids, to coordinate the binding of proteins that have been previously suggested to modulate TJ structure and function.

* This work was supported in part by National Institutes of Health Grant R29-DK55679 (to A. N.).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

** To whom correspondence should be addressed: Drug Delivery/Biology Group, Genentech, Inc., MS #6, 1 DNA Way, South San Francisco, CA 94080. Tel.: 650-225-2592; Fax: 650-225-4459; E-mail: mrsny@gene.com.

Copyright © 2000 by The American Society for Biochemistry and Molecular Biology, Inc.
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