ORP5 and ORP8 bind phosphatidylinositol-4, 5-biphosphate (PtdIns(4,5)P (2)) and regulate its level at the plasma membrane.

ORP5 and ORP8 bind phosphatidylinositol-4, 5-biphosphate (PtdIns(4,5)P (2)) and regulate its level at the plasma membrane.
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DOI:
10.1038/s41467-017-00861-5
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发表时间:
2017-10-02
影响因子:
16.6
通讯作者:
Yang H
Yang H
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ghai R;Du X;Wang H;Dong J;Ferguson C;Brown AJ;Parton RG;Wu JW;Yang H

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氧化固醇结合蛋白(OSBP)相关蛋白(ORP)家族成员ORP 5和ORP 8是与脂质运输有关的内质网膜蛋白。据报道,ORP 5和ORP 8通过与磷脂酰肌醇-4-磷酸(PtdIns(4)P)结合而定位于内质网-质膜连接处,并作为内质网和质膜之间的PtdIns(4)P/磷脂酰丝氨酸反交换剂。在这里,我们提供的证据表明,pleckstrin同源结构域的ORP 5/8通过PtdIns(4,5)P 2,而不是PtdIns(4)P结合介导的招聘ORP 5/8内质网质膜接触网站。ORP 8的OSBP相关结构域可以在体外提取和转运多种磷酸肌醇,并且敲除细胞中的ORP 5和ORP 8增加PtdIns(4,5)P 2的质膜水平,而对PtdIns(4)P的影响很小。总体而言,我们的数据首次表明,除了PtdIns(4)P之外,磷酸肌醇也可以作为共交换剂用于通过ORP转运货物脂质。ORP 5/8是内质网(ER)膜蛋白,参与脂质运输,定位于ER-质膜(PM)接触并维持膜稳态。在这里,作者表明PtdIns(4,5)P2在PM的ORP 5/8的靶向和功能中起关键作用。
ORP5 and ORP8, members of the oxysterol-binding protein (OSBP)-related proteins (ORP) family, are endoplasmic reticulum membrane proteins implicated in lipid trafficking. ORP5 and ORP8 are reported to localize to endoplasmic reticulum–plasma membrane junctions via binding to phosphatidylinositol-4-phosphate (PtdIns(4)P), and act as a PtdIns(4)P/phosphatidylserine counter exchanger between the endoplasmic reticulum and plasma membrane. Here we provide evidence that the pleckstrin homology domain of ORP5/8 via PtdIns(4,5)P 2, and not PtdIns(4)P binding mediates the recruitment of ORP5/8 to endoplasmic reticulum–plasma membrane contact sites. The OSBP-related domain of ORP8 can extract and transport multiple phosphoinositides in vitro, and knocking down both ORP5 and ORP8 in cells increases the plasma membrane level of PtdIns(4,5)P 2 with little effect on PtdIns(4)P. Overall, our data show, for the first time, that phosphoinositides other than PtdIns(4)P can also serve as co-exchangers for the transport of cargo lipids by ORPs. ORP5/8 are endoplasmic reticulum (ER) membrane proteins implicated in lipid trafficking that localize to ER-plasma membrane (PM) contacts and maintain membrane homeostasis. Here the authors show that PtdIns(4,5)P 2 plays a critical role in the targeting and function of ORP5/8 at the PM.
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