cysteine

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cysteine A non‐essential amino acid, but nutritionally important since it spares the essential amino acid methionine. In addition to its role in protein synthesis, cysteine is important as the precursor of taurine, in formation of coenzyme A from the vitamin pantothenic acid and in formation of the tripeptide glutathione. It is used as a dough ‘improver’ in baking. See also cystine.

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cysteine An aliphatic, polar (see POLAR MOLECULE), alpha-amino acid that contains a sulphydryl group.

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cysteine An aliphatic, polar, alpha amino acid that contains a sulphydryl group.

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cysteine (sis-ti-een) n. a sulphur-containing amino acid that is an important constituent of many enzymes.

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cysteine See amino acid.