heme-L-cysteine 616.17730712890625 616.489990234375 719.18646240234375 719.6300048828125 PSI-MOD C 34 H 32 N 4 O 4 Fe 1 heme From DeltaMass: Average Mass: 617. MOD:00144 natural HemeCys1 BINDING Heme (covalent; via 1 link) (12-ethenyl-7-[(1S)-1-([(2R)-2-amino-2-carboxyethyl]sulfanyl)ethyl]-3,8,13,17-tetramethyl-21H,23H-porphine-2,18-bis[2-carboxyethyl]-N21,N22,N23,N24)-ferrate S-Heme (on Cysteine) cysteinyl heme heme-L-cysteine C 37 H 37 N 5 O 5 S 1 Fe 1 C Heme 4-[1-(S-cysteinyl)ethyl]protoporphyrin IX none A protein modification that effectively results from forming an adduct between a cysteine residue and the porphyrin compound heme b, (7,12-diethenyl-3,8,13,17-tetramethylporphyrin-2,18-dipropanoato)iron. porphyrin modified residue metal or metal cluster coordinated L-cysteine residue