A sulfur-containing amino acid that occurs in keratins and other proteins, often in the form of cystine, and is a constituent of many enzymes.
- Chemical formula: HSCH2CH(NH2)COOH.
- Whey proteins are also rich in the sulfur-containing amino acids cysteine and methionine.
- The gelatinase activity was due to metalloproteinases and not cysteine or serine proteinases.
- The integration of reduced sulphur into the amino acid cysteine is a central step in the assimilation of inorganic sulphur.
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