Cysteine

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Biosynthesis of cysteine, catalyzed by cystathionine synthase and cystathionase.

Cysteine is one of the twenty common amino acids. It is one of two amino acids which contain a sulfur atom, the other being methionine, and is one of the two amino acids which contain a hydroxyl group, the other being threonine. Cysteine is a precursor of methionine in the activated methyl cycle, and it is synthesized from a condensation reaction between the amino acid serine and homocysteine.

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