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首页> 外文期刊>Neuron >Molecular determinants for subcellular localization of PSD-95 with an interacting K+ channel.
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Molecular determinants for subcellular localization of PSD-95 with an interacting K+ channel.

机译:具有相互作用的K +通道的PSD-95亚细胞定位的分子决定因素。

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摘要

Ion channels and PSD-95 are colocalized in specific neuronal subcellular locations by an unknown mechanism. To investigate mechanisms of localization, we used biolistic techniques to express GFP-tagged PSD-95 (PSD-95:GFP) and the K(+)-selective channel Kv1.4 in slices of rat cortex. In pyramidal cells, PSD-95:GFP required a single PDZ domain and a region including the SH3 domain for localization to postsynaptic sites. When transfected alone, PSD-95:GFP was present in dendrites but absent from axons. When cotransfected with Kv1.4, PSD-95:GFP appeared in both axons and dendrites, while Kv1.4 was restricted to axons. When domains that mediate the interaction of Kv1.4 and PSD-95 were disrupted, Kv1.4 localized nonspecifically. Our results provide evidence that Kv1.4 itself may determine its subcellular location, while an associated MAGUK protein is a necessary but not sufficient cofactor.
机译:离子通道和PSD-95通过未知机制共定位在特定的神经元亚细胞位置。为了研究定位机制,我们使用了生物弹射技术在大鼠皮质切片中表达了带有GFP标签的PSD-95(PSD-95:GFP)和K(+)选择通道Kv1.4。在锥体细胞中,PSD-95:GFP需要一个PDZ域和一个包含SH3域的区域才能定位到突触后位点。当单独转染时,PSD-95:GFP存在于树突中,但轴突中不存在。当与Kv1.4共转染时,PSD-95:GFP出现在轴突和树突中,而Kv1.4仅限于轴突。当介导Kv1.4和PSD-95相互作用的域被破坏时,Kv1.4非特异性地定位。我们的结果提供了证据,证明Kv1.4本身可能决定其亚细胞位置,而相关的MAGUK蛋白是必需但不足的辅因子。

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