CaMKII phosphorylation of neuroligin-1 regulates excitatory synapses.

CaMKII phosphorylation of neuroligin-1 regulates excitatory synapses.
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DOI:
10.1038/nn.3601
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发表时间:
2014-01
影响因子:
25
通讯作者:
Roche, Katherine W.
Roche, Katherine W.
中科院分区:
医学1区
文献类型:
--
作者:
Bemben, Michael A.;Shipman, Seth L.;Hirai, Takaaki;Herring, Bruce E.;Li, Yan;Badger, John D., II;Nicoll, Roger A.;Diamond, Jeffrey S.;Roche, Katherine W.

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Neuroligins 是突触后细胞粘附分子,通过与神经毒素 (NRXN) 的跨突触相互作用对突触功能发挥重要作用。 Neuroligin-1(NL-1,也称为 NLGN1)的定位和突触效应是兴奋性突触所特有的,能够增强依赖于突触活性或 Ca2+/钙调蛋白激酶 II (CaMKII) 的兴奋性突触。在这里,我们报告 CaMKII 强烈磷酸化 NL-1 的胞内结构域。我们发现 T739 是 NL-1 上的主要 CaMKII 位点,并响应培养的啮齿动物神经元的突触活动和体内感觉体验而被磷酸化。此外,磷酸缺陷突变体 (NL-1 T739A) 降低了 NL-1 的基础和活性驱动的表面表达,导致神经肽介导的兴奋性突触增强减少。据我们所知,我们的结果首次证明了兴奋性突触的两个主要成分 CaMKII 和 NL-1 之间的直接功能相互作用。
Neuroligins are postsynaptic cell adhesion molecules that are important for synaptic function through their trans-synaptic interaction with neurexins (NRXNs). The localization and synaptic effects of neuroligin-1 (NL-1, also called NLGN1) are specific to excitatory synapses with the capacity to enhance excitatory synapses dependent on synaptic activity or Ca2+/calmodulin kinase II (CaMKII). Here we report that CaMKII robustly phosphorylates the intracellular domain of NL-1. We show that T739 is the dominant CaMKII site on NL-1 and is phosphorylated in response to synaptic activity in cultured rodent neurons and sensory experience in vivo. Furthermore, a phosphodeficient mutant (NL-1 T739A) reduces the basal and activity-driven surface expression of NL-1, leading to a reduction in neuroligin-mediated excitatory synaptic potentiation. To the best of our knowledge, our results are the first to demonstrate a direct functional interaction between CaMKII and NL-1, two primary components of excitatory synapses.
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