SOAR and the polybasic STIM1 domains gate and regulate Orai channels.

SOAR and the polybasic STIM1 domains gate and regulate Orai channels.
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DOI:
10.1038/ncb1842
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发表时间:
2009-03
影响因子:
21.3
通讯作者:
Muallem, Shmuel
Muallem, Shmuel
中科院分区:
生物学1区
文献类型:
--
作者:
Yuan, Joseph P.;Zeng, Weizhong;Dorwart, Michael R.;Choi, Young-Jin;Worley, Paul F.;Muallem, Shmuel

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钙池操纵的 Ca2+ 流入由 store002D 操纵的 Ca2+ 通道 (SOC) 介导,是受体诱发的 Ca2+ 信号的核心组成部分。 Orai 通道介导 SOC,STIM1 是内质网驻留的 Ca2+ 传感器,负责控制通道。 STIM1 如何门控和调节 Orai 通道尚不清楚。在这里,我们报告了 STIM1 门控 Orais 的分子基础。所有 Orai 通道均由保守的 STIM1(344–442) 完全激活,我们将其称为 SOAR(STIM1 Orai 激活区域)。 SOAR 与 STIM1(450–485) 联合作用,调节与 Orai1 相互作用的强度。 SOAR 激活的 Orai1 概括了 STIM1 激活的 Orai1 的所有整个动力学特性。 SOAR 内 STIM1 的突变可阻止 Orai1 的激活,但不会阻止 STIM1 和 Orai1 响应 Ca2+ 储存耗尽而共聚,这表明 STIM1-Orai1 共聚不足以激活 Orai1。 SOAR 的激活需要 Orai 完整的 C 末端 α 螺旋区域。删除大部分 Orai1 N 末端会损害 STIM1 对 Orai1 的激活,但 (Δ1–73)Orai1 与 SOAR 相互作用并被 SO​​AR 完全激活。因此,Orai 特征性的内向整流是由多元 STIM1(672-685)和 Orai1 N 末端富含脯氨酸的区域之间的相互作用介导的。因此,Orai1 功能的基本特性可以通过与 STIM1 离散区域的相互作用来合理化。
Store-operated Ca2+ influx is mediated by store002Doperated Ca2+ channels (SOCs) and is a central component of receptor-evoked Ca2+ signals. The Orai channels mediate SOCs and STIM1 is the ER-resident Ca2+ sensor that gates the channels. How STIM1 gates and regulates the Orai channels is unknown. Here, we report the molecular basis for gating of Orais by STIM1. All Orai channels are fully activated by the conserved STIM1(344–442), which we termed SOAR (the STIM1 Orai Activating Region). SOAR acts in combination with STIM1(450–485) to regulate the strength of interaction with Orai1. Orai1 activated by SOAR recapitulates all the entire kinetic properties of Orai1 activated by STIM1. Mutations of STIM1 within SOAR prevent activation of Orai1 without preventing co-clustering of STIM1 and Orai1 in response to Ca2+ store depletion, indicating that STIM1-Orai1 co-clustering is not sufficient for Orai1 activation. An intact C-terminus α-helicial region of Orai is required for activation by SOAR. Deleting most of Orai1 N terminus impaired Orai1 activation by STIM1, but (Δ1–73)Orai1 interacts with and is fully activated by SOAR. Accordingly, the characteristic inward rectification of Orai is mediated by an interaction between the polybasic STIM1(672–685) and a proline-rich region in the N terminus of Orai1. Hence, the essential properties of Orai1 function can be rationalized by interactions with discrete regions of STIM1.
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