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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Phospho-dependent binding of the clathrin AP2 adaptor complex to GABAA receptors regulates the efficacy of inhibitory synaptic transmission.
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Phospho-dependent binding of the clathrin AP2 adaptor complex to GABAA receptors regulates the efficacy of inhibitory synaptic transmission.

机译:网格蛋白AP2接头复合物与GABAA受体的磷酸依赖性结合可调节抑制性突触传递的功效。

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摘要

The efficacy of synaptic inhibition depends on the number of gamma-aminobutyric acid type A receptors (GABA(A)Rs) expressed on the cell surface of neurons. The clathrin adaptor protein 2 (AP2) complex is a critical regulator of GABA(A)R endocytosis and, hence, surface receptor number. Here, we identify a previously uncharacterized atypical AP2 binding motif conserved within the intracellular domains of all GABA(A)R beta subunit isoforms. This AP2 binding motif (KTHLRRRSSQLK in the beta3 subunit) incorporates the major sites of serine phosphorylation within receptor beta subunits, and phosphorylation within this site inhibits AP2 binding. Furthermore, by using surface plasmon resonance, we establish that a peptide (pepbeta3) corresponding to the AP2 binding motif in the GABA(A)R beta3 subunit binds to AP2 with high affinity only when dephosphorylated. Moreover, the pepbeta3 peptide, but not its phosphorylated equivalent (pepbeta3-phos), enhanced the amplitude of miniature inhibitory synaptic current andwhole cell GABA(A)R current. These effects of pepbeta3 on GABA(A)R current were occluded by inhibitors of dynamin-dependent endocytosis supporting an action of pepbeta3 on GABA(A)R endocytosis. Therefore phospho-dependent regulation of AP2 binding to GABA(A)Rs provides a mechanism to specify receptor cell surface number and the efficacy of inhibitory synaptic transmission.
机译:突触抑制的功效取决于在神经元细胞表面表达的A型γ-氨基丁酸受体(GABA(A)Rs)的数量。网格蛋白衔接蛋白2(AP2)复合物是GABA(A)R内吞作用的关键调节剂,因此是表面受体数目的关键调节剂。在这里,我们确定了以前未表征的非典型AP2结合基序保守的所有GABA(A)Rβ亚基亚型的胞内域内。该AP2结合基序(beta3亚基中的KTHLRRRSSQLK)并入了受体β亚基内丝氨酸磷酸化的主要位点,而该位点内的磷酸化抑制了AP2结合。此外,通过使用表面等离子体激元共振,我们建立了对应于GABA(A)R beta3亚基中AP2结合基序的肽(pepbeta3)仅在脱磷酸时才以高亲和力与AP2结合。此外,pepbeta3肽,但不是其磷酸化的等效物(pepbeta3-phos),增强了微型抑制性突触电流和整个细胞GABA(A)R电流的幅度。 pepbeta3对GABA(A)R内吞的这些作用被支持pepbeta3对GABA(A)R内吞作用的动力依赖型内吞的抑制剂所阻断。因此,磷酸化对AP2结合GABA(A)Rs的调节提供了一种机制,可指定受体细胞表面数量和抑制突触传递的功效。

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