Sortilin Antibody - #DF12746

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.

The N-terminal propeptide is cleaved by furin and possibly other homologous proteases.

Phosphorylation at Ser-825 facilitates the interaction with GGA1.

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. 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.
Note: 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. May also be found in SLC2A4/GLUT4 storage vesicles (GSVs) in adipocytes. Localization to the plasma membrane in adipocytes may be enhanced by insulin.

Expressed in brain and prostate (at protein level). Expressed at high levels in brain, spinal cord, heart, skeletal muscle, thyroid, placenta and testis. Expressed at lower levels in lymphoid organs, kidney, colon and liver.

Interacts with LPL and SLC2A4 (By similarity). Interacts with the cytosolic adapter proteins GGA1 and GGA2. Interacts with numerous ligands including the receptor-associated protein LRPAP1/RAP, GM2A and NTS. Forms a complex with NGFR which binds specifically to the precursor forms of NGFB (proNGFB) and BDNF (proBDNF). Interacts with the Trk receptors NTRK1, NTRK2 and NTRK3; may regulate their anterograde axonal transport and signaling. Interacts with CLN5. Interacts with PSAP. Interacts with GRN; this interaction mediates endocytosis and lysosome delivery of progranulin; interaction occurs at the neuronal cell surface in a stressed nervous system.

The N-terminal propeptide may facilitate precursor transport within the Golgi stack. Intrachain binding of the N-terminal propeptide and the extracellular domain may also inhibit premature ligand binding.

The extracellular domain may be shed following protease cleavage in some cell types.

Belongs to the VPS10-related sortilin family. SORT1 subfamily.