Heparan sulfate (BioDeep_00000027629)

描述信息

Heparan sulfate (HS) is a linear polysaccharide that belongs to the class of compounds known as glycosaminoglycans (PMID: 24146040). It is found in all animal tissues and consists of repeating subunits of N-acetylglucosamine and glucuronic acid, and closely related in structure to heparin. It occurs as a proteoglycan (HSPG) in which two or three HS chains are attached to either cell surface components or the extracellular matrix (ECM), where they serve to reinforce cell adhesion (PMID: 27241222). HS synthesis starts with the transfer of xylose from UDP-xylose by the enzyme known as xylosyltransferase (XT) to specific serine residues within the protein core. Attachment of two galactose (Gal) residues by galactosyltransferases I and II (GalTI and GalTII) and glucuronic acid (GlcA) by the enzyme glucuronosyltransferase I (GlcATI) completes the formation of a tetrasaccharide linker. After attachment of the first N-acetylglucosamine (GlcNAc) residue by the enzyme known as GalNAc Transferase I (GalNAcT-I), elongation of the tetrasaccharide linker is continued by the stepwise addition of GlcA and GlcNAc residues. These are transferred from their respective UDP-sugar nucleotides. HS functions through binding to a variety of protein ligands including interferon gamma, Wnt, antithrombin III, interleukin 8, fibroblast growth factor, endostatin and others. HS thereby regulates a wide range of developmental signaling pathways such as the Wnt, Hedgehog, transforming growth factor-β, and fibroblast growth factor pathways (PMID: 15563523). Heparan sulfate plays a role in a number of biological activities, including developmental processes, angiogenesis, blood coagulation, abolishing detachment activity by GrB (Granzyme B) and tumour metastasis.
A heteropolysaccharide that is similar in structure to heparin. It accumulates in individuals with mucopolysaccharidosis.

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