ORP2 couples LDL-cholesterol transport to FAK activation by endosomal cholesterol/PI(4,5)P 2 exchange.

Low-density lipoprotein (LDL)-cholesterol delivery from late endosomes to the plasma membrane regulates focal adhesion dynamics and cell migration, but the mechanisms controlling it are poorly characterized. Here, we employed auxin-inducible rapid degradation of oxysterol-binding protein-related protein 2 (ORP2/OSBPL2) to show that endogenous ORP2 mediates the transfer of LDL-derived cholesterol from late endosomes to focal adhesion kinase (FAK)-/integrin-positive recycling endosomes in human cells. In vitro, cholesterol enhances membrane association of FAK to PI(4,5)P ₂ -containing lipid bilayers. In cells, ORP2 stimulates FAK activation and PI(4,5)P ₂ generation in endomembranes, enhancing cell adhesion. Moreover, ORP2 increases PI(4,5)P ₂ in NPC1-containing late endosomes in a FAK-dependent manner, controlling their tubulovesicular trafficking. Together, these results provide evidence that ORP2 controls FAK activation and LDL-cholesterol plasma membrane delivery by promoting bidirectional cholesterol/PI(4,5)P ₂ exchange between late and recycling endosomes.
(© 2021 The Authors. Published under the terms of the CC BY 4.0 license.)