FEATURES

FAMILY

DESCRIPTION

Also known as OSBP1_HUMAN, OSBP, OSBP1. Lipid transporter involved in lipid countertransport between the Golgi complex and membranes of the endoplasmic reticulum: specifically exchanges sterol with phosphatidylinositol 4-phosphate (PI4P), delivering sterol to the Golgi in exchange for PI4P, which is degraded by the SAC1/SACM1L phosphatase in the endoplasmic reticulum (PubMed:24209621). Binds cholesterol and a range of oxysterols including 25-hydroxycholesterol (PubMed:15746430, PubMed:17428193). Cholesterol binding promotes the formation of a complex with PP2A and a tyrosine phosphatase which dephosphorylates ERK1/2, whereas 25-hydroxycholesterol causes its disassembly (PubMed:15746430). Regulates cholesterol efflux by decreasing ABCA1 stability (PubMed:18450749). Homodimer or homotrimer. Interacts (via FFAT motif) with VAPA (PubMed:24209621, PubMed:20178991). Interacts (via C-terminus) with RELCH (via the third HEAT repeat) (By similarity). Found in a complex composed of RELCH, OSBP1 and RAB11A (By similarity).

EXTERNAL LINKS

OSBP

Oxysterol-binding protein 1

OSBP

Molecular Synopsis