Serine (symbol Ser or S) is an -amino acid that is used in the biosynthesis of proteins. It contains an -amino group (which is in the protonated NH+3 form under biological conditions), a carboxyl group (which is in the deprotonated COO form under biological conditions), and a side chain consisting of a hydroxymethyl group, classifying it as a polar amino acid. It can be synthesized in the human body under normal physiological circumstances, making it a nonessential amino acid. It is encoded by the codons UCU, UCC, UCA, UCG, AGU and AGC. Occurrence This compound is one of the naturally occurring proteinogenic amino acids. Only the L-stereoisomer appears naturally in proteins. It is not essential to the human diet, since it is synthesized in the body from other metabolites, including glycine. Serine was first obtained from silk protein, a particularly rich source, in 1865 by Emil Cramer. Its name is derived from the Latin for silk, sericum. Serine's structure was established in 1902. Food sources with high L-Serine content among their proteins include eggs, edamame, lamb, liver, pork, salmon, sardines, seaweed, tofu.
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