1'-heme-L-histidine (S)-[7-ethenyl-12-[1-((2-amino-2-carboxyethyl)-1H-imidazol-1-yl)ethyl]-3,8,13,17-tetramethyl-21H,23H-porphine-2,18-bis(2-carboxyethyl)-N21,N22,N23,N24]-ferrate 1'-heme-L-histidine 2-[1-(N1'-histidyl)ethyl]protoporphyrin IX 616.17730712890625 616.5 753.2362060546875 753.6400146484375 A protein modification that effectively results from forming an adduct between the tele nitrogen of a histidine residue and the porphyrin compound heme b, (7,12-diethenyl-3,8,13,17-tetramethylporphyrin-2,18-dipropanoato)iron. BINDING Heme (covalent; via tele nitrogen) C 34 Fe 1 H 32 N 4 O 4 C 40 Fe 1 H 39 N 7 O 5 H Heme MOD:00334 N(epsilon)-histidyl heme N(tau)-histidyl heme N1'-histidyl heme PSI-MOD Unimod:390 heme hypothetical tele-histidyl heme porphyrin modified residue metal or metal cluster coordinated L-histidine residue