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
中科院分区:
文献类型:
--
作者:
Maleth, Jozsef;Choi, Seok;Muallem, Shmuel;Ahuja, Malini
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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影响因子:
3.5
作者:
Lee KP;Yuan JP;Hong JH;So I;Worley PF;Muallem S
通讯作者:
Muallem S
影响因子:
64.5
作者:
Park CY;Hoover PJ;Mullins FM;Bachhawat P;Covington ED;Raunser S;Walz T;Garcia KC;Dolmetsch RE;Lewis RS
通讯作者:
Lewis RS
影响因子:
64.5
作者:
Giordano F;Saheki Y;Idevall-Hagren O;Colombo SF;Pirruccello M;Milosevic I;Gracheva EO;Bagriantsev SN;Borgese N;De Camilli P
通讯作者:
De Camilli P
DOI:
10.1073/pnas.1101664108
发表时间:
2011-08-09
影响因子:
11.1
作者:
Hoover, Paul J.;Lewis, Richard S.
通讯作者:
Lewis, Richard S.
影响因子:
--
作者:
Arozarena, Imanol;Calvo, Fernando;Crespo, Piero
通讯作者:
Crespo, Piero