Analysis of heterophilic and homophilic interactions of cadherins using the c-Jun/c-Fos dimerization domains.

The Journal of Biological Chemistry
Thomas AhrensJ Engel

Abstract

Cadherin-mediated cell-cell adhesion is initiated by cis dimerization of cadherin ectodomains at the cell surface followed by an antiparallel trans interaction of dimers on opposing cells. To resolve open questions concerning the molecular details and specificity of cis and trans interactions, ectodomains of E- and P-cadherin were analyzed by chemical cross-linking and by electron microscopy. At the high intrinsic concentration created by artificial oligomerization the N-terminal cadherin (CAD)-domain of P-cadherin are forming ring-like cis dimers. At 2 mm Ca(2+)-associated rings involving two cis dimers indicate trans contacts in electron micrographs. cis and trans interactions were further analyzed by heterodimerization of the ectodomains of E-cadherin (ECAD) and P-cadherin (PCAD) through the leucine zipper domains of c-Jun and c-Fos. ECADJun/ECADFos dimers predominantly form ring-like cis dimers at 1 mm Ca(2+) and double-ringed trans contacts above 2 mm Ca(2+). The Ca(2+)-dependent tetrameric trans contacts of ECADJun/ECADFos dimers are also detectable after chemical cross-linking. Only cis contacts but no trans interactions are observed for heterodimers of ECADFos and the Trp-2 to Ala mutant ECADW2AJun arguing for a decisiv...Continue Reading

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Citations

Jan 1, 2003·Journal of Molecular Biology·Thomas AhrensJürgen Engel
Aug 30, 2002·Current Opinion in Genetics & Development·Ulrich TepassRudolf Winklbauer
Nov 20, 2008·Proceedings of the National Academy of Sciences of the United States of America·Saumendra BajpaiDenis Wirtz
Nov 15, 2007·The Journal of Biological Chemistry·Yuan-Hung ChienDeborah Leckband
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