Oxysterol-binding protein homolog 6

UniProtKB accession:  Q02201

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UniProtKB description:  Lipid transport protein (LTP) involved in non-vesicular transfer of lipids between membranes. Functions in phosphoinositide-coupled directional transport of various lipids by carrying the lipid molecule in a hydrophobic pocket and transferring it between membranes through the cytosol. Involved in maintenance of intracellular sterol distribution and homeostasis (PubMed:15173322, PubMed:16156791, PubMed:23934110, PubMed:26206936). Catalyzes the lipid countertransport between the endoplasmic reticulum (ER) and the plasma membrane (PM). Specifically exchanges phosphatidylserine (PS) with phosphatidylinositol 4-phosphate (PI4P), delivering phosphatidylserine to the PM in exchange for PI4P, which is delivered to the ER-localized PI4P phosphatase SAC1 for degradation. Thus, by maintaining a PI4P gradient at the ER/PM interface, SAC1 drives PS transport (PubMed:23934110, PubMed:26206936). Binds phosphatidylserine and PI4P in a mutually exclusive manner (PubMed:26206936). Also binds phosphatidic acid (PA) (PubMed:16156791).