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Cysteine
? TBD
Proteinogenic amino acid
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Cysteine (; symbol Cys or C) is a semiessential proteinogenic amino acid with the formula HS−CH2−CH(NH2)−COOH. The thiol side chain in cysteine enables the formation of disulfide bonds, and often participates in enzymatic reactions as a nucleophile. Cysteine is chiral, but both D and L-cysteine are found in nature. L‑Cysteine is a protein...

Instance of
type of chemical entity
Subclass of
Proteinogenic amino acid
L-amino acid
dispensable amino acids
DL-cysteine
Amino acid
Part of
L-cysteine binding
Different from
Cytosine
Wikidata