LRRTM2 interacts with Neurexin1 and regulates excitatory synapse formation.

LRRTM2 interacts with Neurexin1 and regulates excitatory synapse formation.
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DOI:
10.1016/j.neuron.2009.12.019
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发表时间:
2009-12-24
期刊:
影响因子:
16.2
通讯作者:
Ghosh, Anirvan
Ghosh, Anirvan
中科院分区:
医学1区
文献类型:
--
作者:
de Wit, Joris;Sylwestrak, Emily;O'Sullivan, Matthew L.;Otto, Stefanie;Tiglio, Katie;Savas, Jeffrey N.;Yates, John R., III;Comoletti, Davide;Taylor, Palmer;Ghosh, Anirvan

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我们确定富含亮氨酸的重复跨膜蛋白LRRTM 2作为兴奋性突触发育和功能的关键调节因子。LRRTM 2定位于转染的海马神经元中的兴奋性突触,并且shRNA介导的LRRTM 2敲低导致兴奋性突触减少而不影响抑制性突触。LRRTM 2与PSD-95相互作用并调节AMPA受体的表面表达,并且慢病毒介导的LRRTM 2体内敲低降低了诱发的兴奋性突触电流的强度。结构-功能研究表明LRRTM 2通过细胞外LRR结构域诱导突触前分化。我们确定Neurexin 1作为LRRTM 2的受体的基础上亲和层析。LRRTM 2与Neurexin 1α和Neurexin 1β结合,并且shRNA介导的Neurexin 1敲低消除了LRRTM 2诱导的突触前分化。这些观察结果表明LRRTM 2-Neurexin 1相互作用在调节兴奋性突触发育中起着关键作用。
We identify the leucine-rich repeat transmembrane protein LRRTM2 as a key regulator of excitatory synapse development and function. LRRTM2 localizes to excitatory synapses in transfected hippocampal neurons, and shRNA-mediated knockdown of LRRTM2 leads to a decrease in excitatory synapses without affecting inhibitory synapses. LRRTM2 interacts with PSD-95 and regulates surface expression of AMPA receptors, and lentivirus-mediated knockdown of LRRTM2 in vivo decreases the strength of evoked excitatory synaptic currents. Structure-function studies indicate that LRRTM2 induces presynaptic differentiation via the extracellular LRR domain. We identify Neurexin1 as a receptor for LRRTM2 based on affinity chromatography. LRRTM2 binds to both Neurexin 1α and Neurexin 1β, and shRNA-mediated knockdown of Neurexin1 abrogates LRRTM2-induced presynaptic differentiation. These observations indicate that an LRRTM2-Neurexin1 interaction plays a critical role in regulating excitatory synapse development.
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