serine

Polar amino acid Ser S RNA code: UCU, UCC, UCA, UCG, AGU, AGC

Serine is a biosynthetic derivative of glycine, and a biosynthetic precursor of purines and pyrimidines, cysteine, tryptophan, and other metabolites.

Serine is found in the active sites of many enzymes including the serine proteases chymotrypsin and trypsin.

Serine is important in signal transduction because it is phosphorylated by serine/threonine kinases.