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Glycosylation


Glycosylation - the addition of specific short-chain sugars to asparagine, serine, or threonine - is very common in membrane proteins that form structural components of the cell surface.
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glycosylation
A catch-all name for a set of very common and very heterogenous chemical modifications. Sugar moieties can be attached to the sidechain hydroxyl groups of Ser/Thr or to the sidechain amide groups of Asn.
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Glycosylation: The covalent addition of sugar moities to N or O atoms present in the side chains of certain amino acids of certain proteins, generally occuring within the Golgi apparatus during secretion of a protein.
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APP is a sialoglycoprotein with two potential N-linked glycosylation sites, one of which may contain a complex oligosaccharide chain.
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The major processing activity is glycosylation: the adding of sugar molecules to form glycoproteins.
In some cells, e.g.
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This reaction (glycosylation) reduces or destroys the function of many enzymes. The low rate of glycosylation is due to glucose's preference for the less reactive cyclic isomer. Nevertheless, many of the long-term complications of diabetes (e.g.
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The threonine side chain can undergo O-linked glycosylation.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Threonine".
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Proteins may be modified in a wide variety of ways, including phosphorylation (addition or a phosphate group), adenylation (addition of an adenine group), glycosylation (addition of a sugar group), acylation (addition of a lipid group), ...
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Post-translational processing: The reactions which alter a protein's covalent structure, such as phosphorylation, glycosylation or proteolytic cleavage.
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These may help the cell change its surface glycosylation and thus evade detection by grazers and/or phages.
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Golgi bodies function in the posttranslational modification (glycosylation) and secretion of proteins or insertion into membranes. Composed of cis, medial and trans compartments as well as a less well defined "trans-golgi network.
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