LRRTM2 functions as a neurexin ligand in promoting excitatory synapse formation.
LRRTM2 functions as a neurexin ligand in promoting excitatory synapse formation.
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DOI:
10.1016/j.neuron.2009.12.012
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发表时间:
2009-12-24
期刊:
影响因子:
16.2
通讯作者:
Suedhof, Thomas C.
中科院分区:
文献类型:
--
作者:
Ko, Jaewon;Fuccillo, Marc V.;Malenka, Robert C.;Suedhof, Thomas C.
Recently, leucine-rich repeat transmembrane proteins (LRRTMs) were found to be synaptic cell-adhesion molecules that, when expressed in non-neuronal cells, induce presynaptic differentiation in contacting axons. We now demonstrate that LRRTM2 induces only excitatory synapses, and that it also acts in transfected neurons similar to neuroligin-1. Using affinity chromatography, we identified α- and β-neurexins as LRRTM2 ligands, again rendering LRRTM2 similar to neuroligin-1. However, whereas neuroligins bind neurexins containing or lacking an insert in splice site #4, LRRTM2 only binds neurexins lacking an insert in splice site #4. Binding of neurexins to LRRTM2 can produce cell-adhesion junctions, consistent with a trans-interaction regulated by neurexin alternative splicing, and recombinant neurexin-1β blocks LRRTM2's ability to promote presynaptic differentiation. Thus, our data suggest that two unrelated postsynaptic cell-adhesion molecules, LRRTMs and neuroligins, unexpectedly bind to neurexins as the same presynaptic receptor, but that their binding is subject to distinct regulatory mechanisms.
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