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Asparagine also provides key sites for N-linked glycosylation, modification of the protein chain with the addition of carbohydrate chains. Typically, a carbohydrate tree can solely be added to an asparagine residue if the latter is flanked on the C side by X- serine or X- threonine , where X is any amino acid with the exception of proline .
Deamidation is a chemical reaction in which an amide functional group in the side chain of the amino acids asparagine or glutamine is removed or converted to another functional group. Typically, asparagine is converted to aspartic acid or isoaspartic acid. Glutamine is converted to glutamic acid or pyroglutamic acid (5-oxoproline).
An Asx turn with an aspartate at residue i. One of the sidechain oxygens of the aspartate forms a hydrogen bond (dotted line) with the mainchain NH group of residue i+2. Colors: red, oxygen; grey, carbon; blue, nitrogen. Hydrogen atoms are omitted. Four types of Asx turn can be distinguished: [8] types I, I’, II and II’.
The reactivity of a functional group can be modified by other functional groups nearby. Functional group interconversion can be used in retrosynthetic analysis to plan organic synthesis. A functional group is a group of atoms in a molecule with distinctive chemical properties, regardless of the other atoms in the molecule. The atoms in a ...
Potassium asparaginate is a potassium salt of L-asparagine amino acid. [2] [3] [4] [5]Potassium asparaginate can be considered both a salt and a coordination complex. [6] [3] As a salt, potassium asparaginate is formed when the potassium ion (K +) replaces the hydrogen ion (H +) in the carboxyl group of L-asparagine, an amino acid; in this process, the carboxyl group (–COOH) in L-asparagine ...
Carbons grey, oxygens red and nitrogens blue. The main chain - main chain hydrogen bond is in red and the side chain - main chain hydrogen bond (which also forms an Asx turn) is dotted grey. When one of the hydrogen bonds is between the main chain oxygen of residue i and the side chain NH of residue i+3 the motif incorporates a beta turn.
[4] [5] The amide group is called a peptide bond when it is part of the main chain of a protein, and an isopeptide bond when it occurs in a side chain, as in asparagine and glutamine. It can be viewed as a derivative of a carboxylic acid ( R−C(=O)−OH ) with the hydroxyl group ( −OH ) replaced by an amino group ( −NR′R″ ); or ...
The different types of lipid-linked oligosaccharide (LLO) precursor produced in different organisms.. N-linked glycosylation is the attachment of an oligosaccharide, a carbohydrate consisting of several sugar molecules, sometimes also referred to as glycan, to a nitrogen atom (the amide nitrogen of an asparagine (Asn) residue of a protein), in a process called N-glycosylation, studied in ...