GKAP orchestrates activity-dependent postsynaptic protein remodeling and homeostatic scaling.

GKAP orchestrates activity-dependent postsynaptic protein remodeling and homeostatic scaling.
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DOI:
10.1038/nn.3259
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发表时间:
2012-12
影响因子:
25
通讯作者:
Lee, Sang H.
Lee, Sang H.
中科院分区:
医学1区
文献类型:
--
作者:
Shin, Seung Min;Zhang, Nanyan;Hansen, Jonathan;Gerges, Nashaat Z.;Pak, Daniel T. S.;Sheng, Morgan;Lee, Sang H.

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慢性活动调节如何导致突触蛋白质的整体重塑和突触缩放?在这里,我们报告了鸟苷酸激酶相关蛋白(GKAP;也称为 SAPAP)在这些过程中的作用,GKAP 是一种将 NMDA 受体 PSD-95 与 Shank-Homer 复合物连接起来的支架分子。过度兴奋会通过泛素-蛋白酶体系统从突触中去除 GKAP,而不活动会诱导大鼠海马神经元中 GKAP 的突触积累。突触 GKAP 水平的双向变化由与不同 Ca2+ 通道耦合的特定 CaMKII 同工型控制。 NMDA 受体激活的 α-CaMKII 磷酸化 GKAP 的 Serine-54,从而诱导 GKAP 多聚泛素化。相比之下,通过 L 型电压依赖性钙通道激活 β-CaMKII 通过磷酸化 Serine-340 和 Serine-384 残基促进 GKAP 募集,从而将 GKAP 与 MyoVa 运动复合体解偶联。值得注意的是,过度表达 GKAP 转换突变体不仅阻碍 PSD-95 和 Shank 的活性依赖性重塑,而且还阻碍双向突触缩放。因此,GKAP 协调的 PSD 蛋白的活动依赖性更新对于稳态可塑性至关重要。
How does chronic activity modulation lead to global remodeling of proteins at synapses and synaptic scaling? Here we report a role of guanylate-kinase-associated-protein (GKAP; also known as SAPAP), a scaffolding molecule linking NMDA receptor-PSD-95 to Shank-Homer complexes, in these processes. Over-excitation removes GKAP from synapses via ubiquitin-proteasome system, while inactivity induces synaptic accumulation of GKAP in rat hippocampal neurons. The bi-directional changes of synaptic GKAP levels are controlled by specific CaMKII isoforms coupled to different Ca2+ channels. α-CaMKII activated by NMDA receptor phosphorylates Serine-54 of GKAP to induce poly-ubiquitination of GKAP. In contrast, β-CaMKII activation via L-type voltage-dependent calcium channel promotes GKAP recruitment by phosphorylating Serine-340 and Serine-384 residues, which uncouples GKAP from MyoVa motor complex. Remarkably, overexpressing GKAP turnover mutants not only hampers activity-dependent remodeling of PSD-95 and Shank but also blocks bi-directional synaptic scaling. Therefore, activity-dependent turnover of PSD proteins orchestrated by GKAP is critical for homeostatic plasticity.
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