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
De Camilli P
中科院分区:
生物学1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

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大多数关于高等真核生物细胞中ER-质膜(PM)接触的可用信息涉及涉及调节Ca 2+进入的蛋白质。然而,越来越多的证据表明,这种接触在细胞生理学中发挥更普遍的作用,指出存在另外普遍表达的ER-PM系链。在这里,我们表明,三个扩展的突触结合蛋白(E-Syts)是ER蛋白,参与这种拴系功能通过C2结构域依赖性的相互作用与PM,需要PI(4,5)P2的情况下,E-Syt 2和E-Syt 3和E-Syt 1的情况下,也升高胞质Ca 2+。当它们形成异聚体复合物时,E-Syts赋予胞质Ca 2+调节ER-PM接触形成。然而,钙池操作的Ca 2+进入不需要依赖于E-Syts的触点。因此,E-Syts(酵母中的三白蛋白)的ER-PM系留功能介导ER-PM接触位点的形成,其在功能上不同于由STIM 1和Orai 1介导的那些。
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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