Triad3A regulates synaptic strength by ubiquitination of Arc.

Triad3A regulates synaptic strength by ubiquitination of Arc.
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DOI:
10.1016/j.neuron.2014.05.016
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发表时间:
2014-06-18
期刊:
影响因子:
16.2
通讯作者:
Ehlers MD
Ehlers MD
中科院分区:
医学1区
文献类型:
--
作者:
Mabb AM;Je HS;Wall MJ;Robinson CG;Larsen RS;Qiang Y;Corrêa SA;Ehlers MD

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活动依赖的基因转录和蛋白质合成是许多形式的学习相关突触可塑性的基础。在兴奋性谷氨酸能突触中,即刻早期基因产物Arc/Arg3.1将突触活动与AMPA型谷氨酸受体的突触后内吞作用偶联。虽然已经描述了电弧感应的机制,但关于终止电弧功能的分子机制知之甚少。在这里,我们证明了RING结构域泛素连接酶Triad 3A/RNF 216泛素化Arc,导致其快速蛋白酶体降解。Triad 3A与Arc相关,定位于网格蛋白包被的凹坑,并与树突和棘中的内吞位点相关。在缺乏Triad 3A的情况下,Arc积累,导致表面AMPA受体的损失。此外,Triad 3A的丢失模拟并闭塞了弧依赖形式的突触可塑性。因此,网格蛋白定位的Triad 3A的Arc的降解调节突触AMPA受体的可用性,并在时间上调节Arc介导的可塑性。
Activity-dependent gene transcription and protein synthesis underlie many forms of learning-related synaptic plasticity. At excitatory glutamatergic synapses, the immediate early gene product Arc/Arg3.1 couples synaptic activity to postsynaptic endocytosis of AMPA-type glutamate receptors. Although the mechanisms for Arc induction have been described, little is known regarding the molecular machinery that terminates Arc function. Here we demonstrate that the RING domain ubiquitin ligase Triad3A/RNF216 ubiquitinates Arc, resulting in its rapid proteasomal degradation. Triad3A associates with Arc, localizes to clathrin-coated pits, and is associated with endocytic sites in dendrites and spines. In the absence of Triad3A, Arc accumulates, leading to the loss of surface AMPA receptors. Furthermore, loss of Triad3A mimics and occludes Arc-dependent forms of synaptic plasticity. Thus, degradation of Arc by clathrin-localized Triad3A regulates the availability of synaptic AMPA receptors and temporally tunes Arc-mediated plasticity at glutamatergic synapses.
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