cysteinylation (disulfide with free L-cysteine) 119.00409698486328125 119.1399993896484375 222.0132904052734375 222.2899932861328125 none 2-amino-3-(2-amino-2-carboxy-ethyl)disulfanyl-propanoic acid S-cystenyl cystenyl bis(beta-amino-beta-carboxyethyl)disulfide bis(alpha-aminopropionic acid)-beta-disulfide C 3 H 5 N 1 O 2 S 1 (2R,2'R)-3,3'-disulfane-1,2-diylbis(2-aminopropanoic acid) 3,3'-dithiobis(2-aminopropanoic acid) MOD:00765 C 6 H 10 N 2 O 3 S 2 beta,beta'-diamino-beta,beta'-dicarboxydiethyldisulfide dicysteine Cysteinylation 3,3'-dithiobisalanine A protein modification that effectively converts an L-cysteine residue to S-(L-cysteinyl)-L-cysteine, forming a disulfide bond with free cysteine. C SCysCys L-cystine natural 3,3'-disulfane-1,2-diylbis(2-azanylpropanoic acid) 3,3'-dithiodialanine MOD_RES S-cysteinyl cysteine PSI-MOD beta,beta'-dithiodialanine This entry is for formation of a disulfide bond between a peptide cysteine and a free cysteine. For the cystine cross-link, see MOD:00234. From DeltaMass: (name misspelled and formula incorrect, N and O reversed) Formula: C6H10O2N3S2 Monoisotopic Mass Change: 222.013 Average Mass Change: 222.283 modified L-cysteine residue disulfide conjugated residue