Functions as a sorting receptor in the Golgi compartment and as a clearance receptor on the cell surface. Required for protein transport from the Golgi apparatus to the lysosomes by a pathway that is independent of the mannose-6-phosphate receptor (M6PR). Also required for protein transport from the Golgi apparatus to the endosomes. Promotes neuronal apoptosis by mediating endocytosis of the proapoptotic precursor forms of BDNF (proBDNF) and NGFB (proNGFB). Also acts as a receptor for neurotensin. May promote mineralization of the extracellular matrix during osteogenic differentiation by scavenging extracellular LPL. Probably required in adipocytes for the formation of specialized storage vesicles containing the glucose transporter SLC2A4/GLUT4 (GLUT4 storage vesicles, or GSVs). These vesicles provide a stable pool of SLC2A4 and confer increased responsiveness to insulin. May also mediate transport from the endoplasmic reticulum to the Golgi.
Specificity
Natural and recombinant Mouse Sortilin
Subcellular Location
Membrane Single-pass type I membrane protein Endoplasmic reticulum membrane Single-pass type I membrane protein Endosome membrane Single-pass type I membrane protein Golgi apparatus Golgi stack membrane Single-pass type I membrane protein Lysosome membrane Single-pass type I membrane protein Nucleus membrane Single-pass type I membrane protein Cell membrane Single-pass type I membrane protein Extracellular side Lysosome membrane Single-pass type I membrane protein Localized to membranes of the endoplasmic reticulum, endosomes, Golgi stack, lysosomes and nucleus. A small fraction of the protein is also localized to the plasma membrane. Also found in SLC2A4/GLUT4 storage vesicles (GSVs) in adipocytes. Localization to the plasma membrane in adipocytes is enhanced by insulin.
Interacts with the cytosolic adapter proteins GGA1 and GGA2. Interacts with numerous ligands including the receptor-associated protein LRPAP1/RAP, NTS and GM2A. Forms a complex with NGFR which binds specifically to the precursor forms of NGFB (proNGFB) and BDNF (proBDNF) (By similarity). Interacts with LPL, PSAP and SLC2A4.