SRGN Peptide - Middle Region Blocking Peptide

This gene encodes a protein best known as a hematopoietic cell granule proteoglycan. Proteoglycans stored in the secretory granules of many hematopoietic cells also contain a protease-resistant peptide core, which may be important for neutralizing hydrolytic enzymes. This encoded protein was found to be associated with the macromolecular complex of granzymes and perforin, which may serve as a mediator of granule-mediated apoptosis. Two transcript variants, only one of them protein-coding, have been found for this gene. [provided by RefSeq, Jul 2010]

SRGN: 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. Belongs to the serglycin family.

Protein type: Secreted; Secreted, signal peptide

Chromosomal Location of Human Ortholog: 10q22.1

Cellular Component: extracellular region; extracellular space; Golgi apparatus; mast cell granule

Molecular Function: protein binding

Biological Process: induction of apoptosis by granzyme; maintenance of granzyme B localization in T cell secretory granule; maintenance of protease localization in mast cell secretory granule; mast cell secretory granule organization and biogenesis; negative regulation of bone mineralization; negative regulation of cytokine secretion; platelet degranulation; protease localization in mast cell secretory granule; protein processing; T cell secretory granule organization and biogenesis