SRGN
Function
Plays a role in formation of mast cell secretory granules and mediates storage of various compounds in secretory vesicles. Required for storage of some proteases in both connective tissue and mucosal mast cells and for storage of granzyme B in T-lymphocytes. Plays a role in localizing neutrophil elastase in azurophil granules of neutrophils. Mediates processing of MMP2. Plays a role in cytotoxic cell granule-mediated apoptosis by forming a complex with granzyme B which is delivered to cells by perforin to induce apoptosis. Regulates the secretion of TNF-alpha and may also regulate protease secretion. Inhibits bone mineralization.
Post-translational modifications
O-glycosylated; contains chondroitin sulfate and heparan sulfate.
Sequence Similarities
Belongs to the serglycin family.
Cellular localization
- Cytoplasmic granule
- Cytolytic granule
- Secreted
- Extracellular space
- Golgi apparatus
- Found in mast cell granules and in cytoplasmic granules of cytolytic T lymphocytes from where it is secreted upon cell activation (By similarity). Secreted constitutively by endothelial cells and macrophages (PubMed:11154222). Located to Golgi apparatus during neutrophil differentiation (PubMed:15136585).
Alternative names
PRG, PRG1, SRGN, Serglycin, Hematopoietic proteoglycan core protein, Platelet proteoglycan core protein, Secretory granule proteoglycan core protein, P.PG