L-cysteine sulfenic acid 119.00409698486328125 119.1399993896484375 15.994915008544921875 16.0 none A protein modification that effectively monooxygenates an L-cysteine residue to L-cysteine sulfenic acid. S-oxycysteine [tautomer] cysteine sulphenic acid cysteine S-oxide [tautomer] C 3 H 5 N 1 O 2 S 1 L-cysteine sulfenic acid S-hydroxycysteine ACT_SITE Cysteine sulfenic acid (-SOH) intermediate 2-amino-2-carboxyethanesulfenic acid S-oxocysteine [tautomer] cysteine sulfoxide [tautomer] mod193 natural Sulfenic Acid (from Cysteine) CysOH 3-sulfenoalanine (2R)-2-amino-3-(hydroxysulfanyl)propanoic acid 2-amino-3-sulfinylpropanoic acid [tautomer] MOD:00210 PSI-MOD Oxidation O 1 (2R)-2-amino-3-(oxido-lambda(4)-sulfanyl)propanoic acid [tautomer] From DeltaMass: Average Mass: 16 Average Mass Change:16 Notes:Green et al. in J. B. C. 270, 18209-18211 (1995) quote Kim and Raines in Eur. J. Biochem. 224, 109-114 (1994). Kim and Raines using ESI-MS and sulfhydryl group titration found that bovine seminal ribonuclease contains a single oxidized sulfhydryl group, which cannot participate in a disulfide bond. This form of cysteine is called sulfenic acid (-SOH). C MOD_RES Cysteine sulfenic acid (-SOH) sulfur oxygenated L-cysteine sulfur monooxygenated residue