首页> 外文期刊>Journal of Molecular Biology >Nuclear sequestration of beta-subunits by Rad and Rem is controlled by 14-3-3 and calmodulin and reveals a novel mechanism for Ca2+ channel regulation
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Nuclear sequestration of beta-subunits by Rad and Rem is controlled by 14-3-3 and calmodulin and reveals a novel mechanism for Ca2+ channel regulation

机译:Rad和Rem对β亚基的核固存受14-3-3和钙调蛋白的控制,揭示了Ca2 +通道调节的新机制

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Voltage-gated Ca2+ channels (VDCCs) are heteromultimeric proteins that mediate Ca2+ influx into cells upon membrane depolarization. These channels are involved in various cellular events, including gene expression, regulation of hormone secretion and synaptic transmission. Kir/Gem, Rad, Rem, and Rem2 belong to the RGK family of Ras-related small G proteins. RGK proteins interact with the beta-subunits and downregulate VDCC activity. Kir/Gem was proposed to prevent surface expression of functional Ca2+ channels, while for Rem2 the mechanism remain controversial. Here, we have analyzed the mechanism by which Rad and Rem regulate VDCC activity. We show that, similar to Kir/Gem and Rem2, 14-3-3 and CaM binding regulate the subcellular distribution of Rad and Rem, which both inhibit Ca2+ channel activity by preventing its expression on the cell surface. This function is regulated by calmodulin and 14-3-3 binding only for Rad and not for Rem. Interestingly, nuclear targeting of Rad and Rem can relocalize and sequester the beta-subunit to the nucleus, thus providing a novel mechanism for Ca2+ channel downregulation. (c) 2005 Elsevier Ltd. All rights reserved.
机译:电压门控Ca2 +通道(VDCC)是异源多聚体蛋白,可在膜去极化时介导Ca2 +流入细胞。这些通道参与各种细胞事件,包括基因表达,激素分泌调节和突触传递。 Kir / Gem,Rad,Rem和Rem2属于与Ras相关的小G蛋白的RGK家族。 RGK蛋白与β亚基相互作用并下调VDCC活性。提出了Kir / Gem来防止功能性Ca2 +通道的表面表达,而对于Rem2,该机制仍存在争议。在这里,我们分析了Rad和Rem调节VDCC活性的机制。我们显示,与Kir / Gem和Rem2相似,14-3-3和CaM结合调节Rad和Rem的亚细胞分布,它们都通过阻止Ca2 +通道在细胞表面的表达来抑制Ca2 +通道的活性。此功能仅受Rad而不受Rem的钙调蛋白和14-3-3结合调节。有趣的是,Rad和Rem的核定靶可以将β亚基重新定位和隔离到核中,从而为Ca2 +通道下调提供了新的机制。 (c)2005 Elsevier Ltd.保留所有权利。

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