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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 - GlcA - Gal -Gal- Xyl -PROTEIN).
Glycoprotein-41 and glycoprotein-120 are HIV viral coat proteins. Soluble glycoproteins often show a high viscosity, for example, in egg white and blood plasma. Miraculin, is a glycoprotein extracted from Synsepalum dulcificum a berry which alters human tongue receptors to recognize sour foods as sweet. [11]
The terms glycans and polysaccharides are defined by IUPAC as synonyms meaning "compounds consisting of a large number of monosaccharides linked glycosidically". [1] However, in practice the term glycan may also be used to refer to the carbohydrate portion of a glycoconjugate, such as a glycoprotein, glycolipid, or a proteoglycan, even if the carbohydrate is only an oligosaccharide. [2]
Chondroitin sulfate proteoglycans are composed of a core protein and a sugar side chain. The core protein is generally a glycoprotein, and the side chains are glycosaminoglycan (GAG) sugar chains attached through a covalent bond. [1] The GAG side chains are of different lengths depending on the CSPG.
Peptidoglycan. The peptidoglycan layer within the bacterial cell wall is a crystal lattice structure formed from linear chains of two alternating amino sugars, namely N-acetylglucosamine (GlcNAc or NAG) and N-acetylmuramic acid (MurNAc or NAM).
Keratan sulfate which may modify core proteins through N-linked glycosylation or O-linked glycosylation of the proteoglycan; Hyaluronic acid (also known as hyaluronan), which is synthesized by integral membrane synthases, which immediately secrete the dynamically elongated disaccharide chain. [clarification needed]
Glycopeptides are peptides that contain carbohydrate moieties covalently attached to the side chains of the amino acid residues that constitute the peptide.. Over the past few decades it has been recognised that glycans on cell surface (attached to membrane proteins or lipids) and those bound to proteins (glycoproteins) play a critical role in biology.
Structure formula of one of the many sulfation patterns of the heparan sulfate subunit. Heparan sulfate (HS) is a linear polysaccharide found in all animal tissues. [1] It occurs as a proteoglycan (HSPG, i.e. Heparan Sulfate ProteoGlycan) in which two or three HS chains are attached in close proximity to cell surface or extracellular matrix proteins.