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Cholesterol is highly enriched at the plasma membrane (PM), and lipid transfer proteins may deliver cholesterol to the PM in a nonvesicular manner. Here, through a mini-screen, we identified the oxysterol binding protein (OSBP)-related protein 2 (ORP2) as a novel mediator of selective cholesterol delivery to the PM. Interestingly, ORP2-mediated enrichment of PM cholesterol was coupled with the removal of phosphatidylinositol 4, 5-bisphosphate (PI(4,5)P2) from the PM. ORP2 overexpression or deficiency impacted the levels of PM cholesterol and PI(4,5)P2, and ORP2 efficiently transferred both cholesterol and PI(4,5)P2in vitro. We determined the structure of ORP2 in complex with PI(4,5)P2 at 2.7 Å resolution. ORP2 formed a stable tetramer in the presence of PI(4,5)P2, and tetramerization was required for ORP2 to transfer PI(4,5)P2. Our results identify a novel pathway for cholesterol delivery to the PM and establish ORP2 as a key regulator of both cholesterol and PI(4,5)P2 of the PM.
Pubmed ID: 30581148 RIS Download
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A free reference manager and academic social network to organize your research, collaborate with others online, and discover the latest research. Automatically generate bibliographies, Collaborate easily with other researchers online, Easily import papers from other research software, Find relevant papers based on what you're reading, Access your papers from anywhere online, Read papers on the go with the iPhone app. The software, Mendeley Desktop, offers: * Automatic extraction of document details * Efficient management of your papers * Sharing and synchronization of your library (or parts of it) * Additional features: A plug-in for citing your articles in Microsoft Word, OCR (image-to-text conversion, so you can full-text search all your scanned PDFs), etc The website, Mendeley Web, complements Mendeley Desktop by offering these features: * An online back up of your library * Statistics of all things interesting * A research network that allows you to keep track of your colleagues' publications, conference participations, awards etc * A recommendation engine for papers that might interest you
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