Ca(2+) signals initiate at immobile IP(3) receptors adjacent to ER-plasma membrane junctions.
Ca(2+) signals initiate at immobile IP(3) receptors adjacent to ER-plasma membrane junctions.
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DOI:
10.1038/s41467-017-01644-8
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发表时间:
2017-11-15
影响因子:
16.6
通讯作者:
Taylor CW
中科院分区:
文献类型:
--
作者:
Thillaiappan NB;Chavda AP;Tovey SC;Prole DL;Taylor CW
IP3 receptors (IP3Rs) release Ca2+ from the ER when they bind IP3 and Ca2+. The spatial organization of IP3Rs determines both the propagation of Ca2+ signals between IP3Rs and the selective regulation of cellular responses. Here we use gene editing to fluorescently tag endogenous IP3Rs, and super-resolution microscopy to determine the geography of IP3Rs and Ca2+ signals within living cells. We show that native IP3Rs cluster within ER membranes. Most IP3R clusters are mobile, moved by diffusion and microtubule motors. Ca2+ signals are generated by a small population of immobile IP3Rs. These IP3Rs are licensed to respond, but they do not readily mix with mobile IP3Rs. The licensed IP3Rs reside alongside ER-plasma membrane junctions where STIM1, which regulates store-operated Ca2+ entry, accumulates after depletion of Ca2+ stores. IP3Rs tethered close to ER-plasma membrane junctions are licensed to respond and optimally placed to be activated by endogenous IP3 and to regulate Ca2+ entry. IP3 receptors mediate Ca2+ release from the endoplasmic reticulum. Here the authors show that only a small fraction of IP3 receptors initiate Ca2+ signals; these immobile IP3 receptors adjacent to the plasma membrane are optimally placed to control STIM1-dependent Ca2+ entry.
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DOI:
10.1074/jbc.m110.162073
发表时间:
2010-12-03
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Brailoiu E;Rahman T;Churamani D;Prole DL;Brailoiu GC;Hooper R;Taylor CW;Patel S
通讯作者:
Patel S
影响因子:
4
作者:
Chakraborty S;Deb BK;Chorna T;Konieczny V;Taylor CW;Hasan G
通讯作者:
Hasan G
影响因子:
64.8
作者:
Fan G;Baker ML;Wang Z;Baker MR;Sinyagovskiy PA;Chiu W;Ludtke SJ;Serysheva II
通讯作者:
Serysheva II
影响因子:
17.3
作者:
Gaj, Thomas;Gersbach, Charles A.;Barbas, Carlos F., III
通讯作者:
Barbas, Carlos F., III
影响因子:
5.5
作者:
Bootman, M;Niggli, E;Lipp, P
通讯作者:
Lipp, P