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O-linked glycosylation is the attachment of a sugar molecule to the oxygen atom of serine (Ser) or threonine (Thr) residues in a protein. O -glycosylation is a post-translational modification that occurs after the protein has been synthesised.
O-GlcNAc differs from other forms of protein glycosylation: (i) O-GlcNAc is not elongated or modified to form more complex glycan structures, (ii) O-GlcNAc is almost exclusively found on nuclear and cytoplasmic proteins rather than membrane proteins and secretory proteins, and (iii) O-GlcNAc is a highly dynamic modification that turns over more ...
Protein O-GlcNAc transferase also known as OGT or O-linked N-acetylglucosaminyltransferase is an enzyme (EC 2.4.1.255) that in humans is encoded by the OGT gene. [ 5 ] [ 6 ] OGT catalyzes the addition of the O -GlcNAc post-translational modification to proteins .
The most common method of glycosylation of N-linked glycoproteins is through the reaction between a protected glycan and a protected Asparagine. [5] Similarly, an O-linked glycoprotein can be formed through the addition of a glycosyl donor with a protected Serine or Threonine. [5] These two methods are examples of natural linkage. [5]
Glycosylation is also present in the cytoplasm and nucleus as the O-GlcNAc modification. Aglycosylation is a feature of engineered antibodies to bypass glycosylation. [3] [4] Five classes of glycans are produced: N-linked glycans attached to a nitrogen of asparagine or arginine side-chains.
Galectins are a class of proteins that bind specifically to β-galactoside sugars, such as N-acetyllactosamine (Galβ1-3GlcNAc or Galβ1-4GlcNAc), which can be bound to proteins by either N-linked or O-linked glycosylation. They are also termed S-type lectins due to their dependency on disulphide bonds for stability and carbohydrate binding ...
O-GlcNAcylation is a form of glycosylation, the site-specific enzymatic addition of saccharides to proteins and lipids. This form of glycosylation is with O-linked β-N-acetylglucosamine or β-O-linked 2-acetamido-2-deoxy-D-glycopyranose (O-GlcNAc).
This family transfers an N-acetyl galactosamine to the hydroxyl group of a serine or threonine residue in the first step of O-linked oligosaccharide biosynthesis. Individual GalNAc-transferases have distinct activities and initiation of O-glycosylation is regulated by a repertoire of GalNAc-transferases
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