Any L-cysteine derivative obtained by conversion of the thiol group into a sulfide.
| Member | Definition | Role |
|---|
| carbocysteine | An L-cysteine thioether that is L-cysteine in which the hydrogen of the thiol group has been replaced by a carboxymethyl group. | S-carboxymethyl-L-cysteine |
| cysteine tryptophylquinone | An L-tryptophan derivative that is L-tryptophan-6,7-dione in which a cysteine unit is attached at position 4 via its side-chain thiol group. | cysteine tryptophylquinone |
| felinine | A cysteine thioether that is the S-(4-hydroxy-2-methylbutan-2-yl) derivative of L-cysteine. It is a major component of the urine of the domestic cat. | felinine zwitterion; felinine |
| lanthiopeptin | A type B lantibiotic consisting of a 19 amino acid tetracyclic polypeptide produced by Streptomyces cinnamoneus. | cinnamycin |
| leukotriene e4 | A leukotriene that is (7E,9E,11Z,14Z)-icosa-7,9,11,14-tetraenoic acid substituted by a hydroxy group at position 5 (5S) and an L-cystein-S-yl group at position 6 (6R). | leukotriene E4 |
| s-(1,2-dicarboxyethyl)cysteine | An L-cysteine thioether that is L-cysteine in which the hydrogen of the thiol group has been replaced by a 1,2-dicarboxyethyl group. It is a chemical modification which occurs in tissue proteins and formed by a Michael addition of cysteine to fumaric acid. | S-(2-succinyl)-L-cysteine |
| s-2-aminoethyl cysteine | A cysteine derivative that is the S-(2-aminoethyl) analogue of L-cysteine; reported to have cytotoxic effects. | L-thialysine |