pyrroloquinoline quinone 2,4,6-tricarboxylic-pyrrolo[2,3-5,6]quinoline 8,9-quinone 2,7,9-tricarboxy-1H-pyrrolo(2,3-f)quinoline-4,5-dione 330.012420654296875 330.209991455078125 37.906494140625 37.9199981689453125 4,5-dihydro-4,5-dioxo-1H-pyrrolo[2,3-5,6]quinoline-2,7,9-tricarboxylic acid A protein modification that effectively doubly cross-links an L-glutamic acid residue and an L-tyrosine residue with a carbon-carbon bond and a carbon-nitrogen bond to form pyrroloquinoline quinone. C 0 H -10 N 0 O 3 C 14 H 6 N 2 O 8 CROSSLNK Pyrroloquinoline quinone (Glu-Tyr) Cross-link 2. E, Y MOD:00288 PSI-MOD coenzyme PQQ methoxatin natural pyrroloquinoline quinone uniprot.ptm:PTM-0263 uncategorized crosslinked residues crosslinked L-glutamic acid residue crosslinked L-tyrosine residue