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Hyaluronic acid is an important component of articular cartilage, where it is present as a coat around each cell (chondrocyte). When aggrecan monomers bind to hyaluronan in the presence of HAPLN1 (hyaluronic acid and proteoglycan link protein 1), large, highly negatively charged aggregates form.
Glycosaminoglycans[ 1 ] (GAGs) or mucopolysaccharides[ 2 ] are long, linear polysaccharides consisting of repeating disaccharide units (i.e. two-sugar units). The repeating two-sugar unit consists of a uronic sugar and an amino sugar, except in the case of the sulfated glycosaminoglycan keratan, where, in place of the uronic sugar there is a ...
Glycosaminoglycans (GAGs) are carbohydrate polymers and mostly attached to extracellular matrix proteins to form proteoglycans (hyaluronic acid is a notable exception; see below). Proteoglycans have a net negative charge that attracts positively charged sodium ions (Na + ), which attracts water molecules via osmosis, keeping the ECM and ...
Proteoglycans are proteins [1] that are heavily glycosylated. The basic proteoglycan unit consists of a "core protein " with one or more covalently attached glycosaminoglycan (GAG) chain (s). [2] The point of attachment is a serine (Ser) residue to which the glycosaminoglycan is joined through a tetrasaccharide bridge (e.g. chondroitin sulfate ...
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Aggrecan is a critical component for cartilage structure and the function of joints. Functionally, the G1 domain interacts with hyaluronic acid and link protein, forming stable ternary complexes in the extracellular matrix. G2 is homologous to the tandem repeats of G1 and of link protein and is involved in product processing.
proteins. Hyaluronan synthases (HAS) are membrane-bound enzymes that use UDP-α- N -acetyl- D -glucosamine and UDP-α- D -glucuronate as substrates to produce the glycosaminoglycan hyaluronan at the cell surface and extrude it through the membrane into the extracellular space.
Chondroitin sulfate is a sulfated glycosaminoglycan (GAG) [1] composed of a chain of alternating sugars (N-acetylgalactosamine and glucuronic acid). It is usually found attached to proteins as part of a proteoglycan. [1] A chondroitin chain can have over 100 individual sugars, each of which can be sulfated in variable positions and quantities ...