Translocation between PI(4,5)P2-poor and PI(4,5)P2-rich microdomains during store depletion determines STIM1 conformation and Orai1 gating.

Translocation between PI(4,5)P2-poor and PI(4,5)P2-rich microdomains during store depletion determines STIM1 conformation and Orai1 gating.
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DOI:
10.1038/ncomms6843
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发表时间:
2014-12-17
影响因子:
16.6
通讯作者:
Ahuja, Malini
Ahuja, Malini
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Maleth, Jozsef;Choi, Seok;Muallem, Shmuel;Ahuja, Malini

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Orai 1-STIM 1电流经历由SARAF与STIM 1结合介导的缓慢Ca 2+依赖性失活(SCDI)。在这里,我们报告使用SCDI的SARAF作为探针的构象和微域定位的Orai 1-STIM 1复合物。我们发现STIM 1与Orai 1 C末端和STIM 1 K结构域的相互作用是SARAF与STIM 1和SCDI相互作用所必需的。STIM 1-Orai 1必须位于由E-Syt 1束缚的PM/ER微区中,由Septin 4稳定,并富含PI(4,5)P2,以进行STIM 1-SARAF相互作用。将STIM 1靶向PI(4,5)P2富集和贫乏微结构域揭示了仅当STIM 1-Orai 1在PI(4,5)P2富集微结构域内时观察到SARAF依赖性SCDI。值得注意的是,储存耗尽导致STIM 1-Orai 1短暂定位在PI(4,5)P2贫乏微结构域中,然后转移到PI(4,5)P2富集结构域。这些发现揭示了PM/ER系链在Orai 1功能调节中的作用,以及PI(4,5)P2涉及PI(4,5)P2微结构域之间易位的新的调节模式。
The Orai1-STIM1 current undergoes slow Ca2+-dependent inactivation (SCDI) mediated by binding of SARAF to STIM1. Here, we report the use of SCDI by SARAF as a probe of the conformation and microdomain localization of the Orai1-STIM1 complex. We find that interaction of STIM1 with Orai1 C terminus and the STIM1 K-domain are required for interaction of SARAF with STIM1 and SCDI. STIM1-Orai1 must be in a PM/ER microdomain tethered by E-Syt1, stabilized by Septin4 and enriched in PI(4,5)P2 for STIM1-SARAF interaction. Targeting STIM1 to PI(4,5)P2 rich and poor microdomains reveals that SARAF-dependent SCDI is observed only when STIM1-Orai1 are within the PI(4,5)P2-rich microdomain. Notably, store depletion results in transient localization of STIM1-Orai1 in the PI(4,5)P2-poor microdomain, which then translocate to the PI(4,5)P2-rich domain. These findings reveal the role of PM/ER tethers in the regulation of Orai1 function and a new mode of regulation by PI(4,5)P2 involving translocation between PI(4,5)P2 microdomains.
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