Bridging the Molecular and Biological Functions of the Oxysterol-binding Protein Family

Overview

Journal Cell Mol Life Sci

Publisher Springer

Specialty Biology

Date 2018 Mar 15

PMID 29536114

Citations 50

Authors

Antonietta Pietrangelo

Neale D Ridgway

Affiliations

Soon will be listed here.

Abstract

Oxysterol-binding protein (OSBP) and OSBP-related proteins (ORPs) constitute a large eukaryotic gene family that transports and regulates the metabolism of sterols and phospholipids. The original classification of the family based on oxysterol-binding activity belies the complex dual lipid-binding specificity of the conserved OSBP homology domain (OHD). Additional protein- and membrane-interacting modules mediate the targeting of select OSBP/ORPs to membrane contact sites between organelles, thus positioning the OHD between opposing membranes for lipid transfer and metabolic regulation. This unique subcellular location, coupled with diverse ligand preferences and tissue distribution, has identified OSBP/ORPs as key arbiters of membrane composition and function. Here, we will review how molecular models of OSBP/ORP-mediated intracellular lipid transport and regulation at membrane contact sites relate to their emerging roles in cellular and organismal functions.

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