Evolutionary conserved role for TARPs in the gating of glutamate receptors and tuning of synaptic function.

Evolutionary conserved role for TARPs in the gating of glutamate receptors and tuning of synaptic function.
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DOI:
10.1016/j.neuron.2008.07.023
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发表时间:
2008-09-25
期刊:
影响因子:
16.2
通讯作者:
Maricq AV
Maricq AV
中科院分区:
医学1区
文献类型:
--
作者:
Wang R;Walker CS;Brockie PJ;Francis MM;Mellem JE;Madsen DM;Maricq AV

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大脑中的神经传递严重依赖于AMPA类离子型谷氨酸受体(AMPAR)介导的兴奋性突触信号。已知AMPAR与跨膜AMPA受体调节蛋白(TARP)相关。在脊椎动物中,至少有四个TARP似乎有多余的作用,作为专性伴侣的AMPAR,从而大大复杂的分析TARP参与突触功能。我们已经克服了这一限制,确定和突变的基本设置的TARPs在C。elegans(STG-1和STG-2)。在TARP突变体中,AMPAR介导的电流和蠕虫行为被选择性地破坏,尽管表面表达和受体聚集明显正常。重组实验表明,STG-1和STG-2都可以在功能上取代脊椎动物的TARPs来改变受体功能。因此,我们表明,TARPs是专性的辅助亚基AMPAR的主要,进化保守的功能作用,在修改电流动力学。
Neurotransmission in the brain is critically dependent on excitatory synaptic signaling mediated by AMPA-class ionotropic glutamate receptors (AMPARs). AMPARs are known to be associated with Transmembrane AMPA receptor Regulatory Proteins (TARPs). In vertebrates, at least four TARPs appear to have redundant roles as obligate chaperones for AMPARs, thus greatly complicating analysis of TARP participation in synaptic function. We have overcome this limitation by identifying and mutating the essential set of TARPs in C. elegans (STG-1 and STG-2). In TARP mutants, AMPAR mediated currents and worm behaviors are selectively disrupted despite apparently normal surface expression and clustering of the receptors. Reconstitution experiments indicate that both STG-1 and STG-2 can functionally substitute for vertebrate TARPs to modify receptor function. Thus, we show that TARPs are obligate auxiliary subunits for AMPARs with a primary, evolutionarily conserved functional role in the modification of current kinetics.
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