Functional cis-heterodimers of N- and R-cadherins.

Functional cis-heterodimers of N- and R-cadherins.
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DOI:
10.1083/jcb.148.3.579
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发表时间:
2000-02-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Shapiro L
Shapiro L
中科院分区:
其他
文献类型:
--
作者:
Shan WS;Tanaka H;Phillips GR;Arndt K;Yoshida M;Colman DR;Shapiro L

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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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