S-phycocyanobilin-L-cysteine (2R,3R)-3-[(1R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-18-ethyl-1,2,3,19,21,22,24-heptahydro-2,7,13,17-tetramethyl-1,19-dioxo-(21H,22H,24H)-bilin-8,12-dipropanoic acid (2R,3R)-3-[(1R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-8,12-bis(2-carboxyethyl)-18-ethyl-2,7,13,17-tetramethyl-1,2,3,19,21,22,24-heptahydrobilin-1,19(21H,22H,24H)-dione 586.27911376953125 586.69000244140625 689.288330078125 689.83001708984375 A protein modification that effectively results from forming an adduct between a cysteine residue and the tetrapyrrole compound phycocyanobilin. BINDING Phycocyanobilin chromophore (covalent; via 1 link) C C 33 H 38 N 4 O 6 S 0 C 36 H 43 N 5 O 7 S 1 From DeltaMass: Average Mass: 587. MOD:00140 PCB PSI-MOD Phycocyanobilin S-Phycocyanobilin (on Cysteine) S-phycocyanobilin-L-cysteine Unimod:387 natural phycobilin cysteine phycocyanobilin phycocyanobilin cysteine adduct tetrapyrrole modified residue modified L-cysteine residue