Abstract
Store-operated Ca2+ entry (SOCE) is a ubiquitous mechanism for Ca2+ influx in mammalian cells with important physiological implications. Since the discovery of SOCE more than three decades ago, the mechanism that communicates the information about the amount of Ca2+ accumulated in the intracellular Ca2+ stores to the plasma membrane channels and the nature of these channels have been matters of intense investigation and debate. The stromal interaction molecule-1 (STIM1) has been identified as the Ca2+ sensor of the intracellular Ca2+ compartments that activates the store-operated channels. STIM1 regulates two types of store-dependent channels: the Ca2+ release-activated Ca2+ (CRAC) channels, formed by Orai1 subunits, that conduct the highly Ca2+ selective current I CRAC and the cation permeable store-operated Ca2+ (SOC) channels, which consist of Orai1 and TRPC1 proteins and conduct the non-selective current I SOC. While the crystal structure of Drosophila CRAC channel has already been solved, the architecture of the SOC channels still remains unclear. The dynamic interaction of STIM1 with the store-operated channels is modulated by a number of proteins that either support the formation of the functional STIM1-channel complex or protect the cell against Ca2+ overload.
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- [Ca2+]c :
-
cytosolic free Ca2+ concentration
- AMPA:
-
alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate
- CRAC channels:
-
Ca2+-release activated Ca2+ channels
- CTID:
-
C-terminal inhibitory domain
- ER:
-
endoplasmic reticulum
- IP3 :
-
inositol 1,4,5-trisphosphate
- NAADP:
-
nicotinic acid adenine dinucleotide phosphate
- NMDA:
-
N-methyl-D-aspartate
- OAG:
-
1-oleoyl-2-acetyl-sn-glycerol
- PM:
-
plasma membrane
- ROC:
-
receptor-operated channels
- ROS:
-
reactive oxygen species
- SERCA:
-
sarco/endoplasmic reticulum Ca2+ ATPase
- SMOC:
-
second messenger-operated channels
- SOAP:
-
STIM1-Orai1 Association Pocket
- SOC channels:
-
store-operated Ca2+ channels
- SOCE:
-
store-operated Ca2+ entry
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Acknowledgements
This work was supported by MINECO (Grant BFU2016-74932-C2-1-P/2-P) and Junta de Extremadura-FEDER (IB16046 and GR18061). IJ and JJL were supported by Juan de la Cierva Program (IJCI_2015-25665) and Junta de Extremadura-FEDER (IB16046), respectively.
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Lopez, J.J. et al. (2020). Molecular Basis and Regulation of Store-Operated Calcium Entry. In: Islam, M. (eds) Calcium Signaling. Advances in Experimental Medicine and Biology, vol 1131. Springer, Cham. https://doi.org/10.1007/978-3-030-12457-1_17
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