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.
Suedhof, Thomas C.
中科院分区:
医学1区
文献类型:
--
作者:
Ko, Jaewon;Fuccillo, Marc V.;Malenka, Robert C.;Suedhof, Thomas C.

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最近,亮氨酸丰富的重复跨膜蛋白(LRRTMs)被发现是突触细胞粘附分子,当在非神经元细胞中表达时,诱导接触轴突的突触前分化。我们现在证明LRRTM 2只诱导兴奋性突触,并且它也在类似于neuroligin-1的转染神经元中起作用。使用亲和层析,我们鉴定了α-和β-neurexins作为LRRTM 2配体,再次使LRRTM 2与神经配素-1相似。然而,尽管神经配蛋白结合在剪接位点#4中含有或缺乏插入物的神经毒素,但LRRTM 2仅结合在剪接位点#4中缺乏插入物的神经毒素。neurexin与LRRTM 2的结合可以产生细胞粘附连接,这与neurexin选择性剪接调节的反式相互作用一致,并且重组neurexin-1β阻断LRRTM 2促进突触前分化的能力。因此,我们的数据表明,两个不相关的突触后细胞粘附分子,LRRTM和neuroligins,出乎意料地结合neurexins作为相同的突触前受体,但它们的结合受到不同的监管机制。
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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