期刊
EUROPEAN JOURNAL OF CELL BIOLOGY
卷 83, 期 9, 页码 449-456出版社
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1078/0171-9335-00410
关键词
synaptogenesis; GABA; cell adhesion; neurexin; postsynaptic density; gephyrin
类别
Neuroligins are cell adhesion proteins that are thought to instruct the formation and alignment of synaptic specializations. The three known rodent neuroligin isoforms share homologous extracellular acetylcholinesterase-like domains that bridge the synaptic cleft and bind beta-neurexins. All neuroligins have identical intracellular C-terminal motifs that bind to PDZ domains of various target proteins. Neuroligin 1 is specifically localized to glutamatergic postsynaptic specializations. We show here that neuroligin 2 is exclusively localized to inhibitory synapses in rat brain and dissociated neurons. In immature neurons, neuroligin 2 is found at synapses and also at GABA(A) receptor aggregates that are not facing presynaptic termini, indicating that postsynaptic mechanisms lead to synaptic recruitment of neuroligin 2. Our findings identify neuroligin 2 as a new cell adhesion protein specific for inhibitory synapses and open new avenues for identifiying the constituents of this unique type of postsynaptic specialization.
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