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Alanine (symbol Ala or A), [4] or α-alanine, is an α-amino acid that is used in the biosynthesis of proteins. It contains an amine group and a carboxylic acid group, both attached to the central carbon atom which also carries a methyl group side chain. Consequently it is classified as a nonpolar, aliphatic α-amino acid.
The two amino acid residues are linked through a peptide bond. As both the amine and carboxylic acid groups of amino acids can react to form amide bonds, one amino acid molecule can react with another and become joined through an amide linkage. This polymerization of amino acids is what creates proteins.
β-Alanine (beta-alanine) is a naturally occurring beta amino acid, which is an amino acid in which the amino group is attached to the β-carbon (i.e. the carbon two carbon atoms away from the carboxylate group) instead of the more usual α-carbon for alanine (α-alanine). The IUPAC name for β-alanine is 3-aminopropanoic acid.
{α/2}-aminopropionic acid AIDS{-}071780 HSDB 1801 NSC 206315. Database data: ... ^a EINECS for D-alanine ^a EINECS for L-alanine ^a CID 602 from PubChem ^a CID ...
blue marked carboxyl end (L-alanine) Peptides and proteins are often described by the number of amino acids in their chain, e.g. a protein with 158 amino acids may be described as a "158 amino-acid-long protein". Peptides of specific shorter lengths are named using IUPAC numerical multiplier prefixes: A monopeptide has one amino acid.
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L-amino-acid oxidases convert L-amino acids to the α-ketoacids, which are susceptible to reductive amination. Some amino acids are prone to racemization, one example being lysine, which racemizes via formation of pipecolic acid. In peptides, L-amino acid residues slowly racemize, resulting in the formation of some D-amino acid residues.
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