Lysine (symbol Lys or K)[1] is an amino acid that is used in the biosynthesis of proteins. It contains an amino group (which is in the protonated NH3+ form under biological conditions), an carboxylic acid group (which is in the deprotonated COO form under biological conditions), and a side chain lysyl ((CH2)4NH2), classifying it as a basic, charged (at physiological pH), aliphatic amino acid. It is encoded by the codons, AAA and AAG. Like almost all other amino acids, the + carbon is chiral and lysine may refer to either enantiomer or a racemic mixture of both. For the purpose of this article, lysine will refer to the biologically active enantiomer L-lysine, where the -carbon is in the S configuration

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