Functional cis-heterodimers of N- and R-cadherins |
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| Authors: | Shan W S Tanaka H Phillips G R Arndt K Yoshida M Colman D R Shapiro L |
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| Affiliation: | Department of Biochemistry and Molecular Biology, Program in Cell Adhesion, The Mount Sinai School of Medicine, New York University, New York 10029, USA. |
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| Abstract: | Classical cadherins form parallel cis-dimers that emanate from a single cell surface. It is thought that the cis-dimeric form is active in cell-cell adhesion, whereas cadherin monomers are likely to be inactive. Currently, cis-dimers have been shown to exist only between cadherins of the same type. Here, we show the specific formation of cis-heterodimers between N- and R-cadherins. E-cadherin cannot participate in these complexes. Cells coexpressing N- and R-cadherins show homophilic adhesion in which these proteins coassociate at cell-cell interfaces. We performed site- directed mutagenesis studies, the results of which support the strand dimer model for cis-dimerization. Furthermore, we show that when N- and R-cadherins are coexpressed in neurons in vitro, the two cadherins colocalize at certain neural synapses, implying biological relevance for these complexes. The present study provides a novel paradigm for cadherin interaction whereby selective cis-heterodimer formation may generate new functional units to mediate cell-cell adhesion. |
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| Keywords: | cadherins cell adhesion heterophilic binding synaptic adhesion dimerization |
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