PI(4,5)P(2)-dependent and Ca(2+)-regulated ER-PM interactions mediated by the extended synaptotagmins.
PI(4,5)P(2)-dependent and Ca(2+)-regulated ER-PM interactions mediated by the extended synaptotagmins.
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DOI:
10.1016/j.cell.2013.05.026
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发表时间:
2013-06-20
期刊:
影响因子:
64.5
通讯作者:
De Camilli P
中科院分区:
文献类型:
--
作者:
Giordano F;Saheki Y;Idevall-Hagren O;Colombo SF;Pirruccello M;Milosevic I;Gracheva EO;Bagriantsev SN;Borgese N;De Camilli P
Most available information on ER-plasma membrane (PM) contacts in cells of higher eukaryotes concerns proteins implicated in the regulation of Ca2+ entry. However, growing evidence suggests that such contacts play more general roles in cell physiology, pointing to the existence of additionally ubiquitously expressed ER-PM tethers. Here we show that the three Extended-Synaptotagmins (E-Syts) are ER proteins that participate in such tethering function via C2 domain-dependent interactions with the PM that require PI(4,5)P2 in the case of E-Syt2 and E-Syt3 and also elevation of cytosolic Ca2+ in the case of E-Syt1. As they form heteromeric complexes, the E-Syts confer cytosolic Ca2+ regulation to ER-PM contact formation. E-Syts-dependent contacts, however, are not required for store-operated Ca2+ entry. Thus, the ER-PM tethering function of the E-Syts (tricalbins in yeast), mediate the formation of ER-PM contacts sites which are functionally distinct from those mediated by STIM1 and Orai1.
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