4'-(S-L-cysteinyl)-L-tryptophyl quinone 27.958528518676757812 27.969999313354492188 317.047027587890625 317.32000732421875 3-(2-amino-2-carboxyethyl)-4-[2-amino-2-carboxyethyl]sulfanyl-6,7-indolinedione C 14 H 11 N 3 O 4 S 1 A protein modification that effectively cross-links an L-cysteine residue and an L-tryptophan residue by a thioether bond to form 4'-(S-L-cysteinyl)-L-tryptophyl quinone. cysteine tryptophylquinone PSI-MOD MOD:00318 CTQ none C, W 4-(S-cysteinyl)tryptophan-6,7-dione (2R)-2-amino-3-[(3-[(2S)-2-amino-2-carboxyethyl]-6,7-dioxo-6,7-dihydro-1H-indol-4-yl)sulfanyl]propanoic acid 4'-(L-cystein-S-yl)-L-tryptophyl quinone natural CROSSLNK 4'-cysteinyl-tryptophylquinone (Cys-Trp) Cross-link 2; secondary to RESID:AA0148. H -4 O 2 thioether crosslinked residues crosslinked L-tryptophan residue