5vrd is a 4 chain structure with sequence from Methylorubrum extorquens AM1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
PQQCD_METEA Ring cyclization and eight-electron oxidation of 3a-(2-amino-2-carboxyethyl)-4,5-dioxo-4,5,6,7,8,9-hexahydroquinoline-7,9-dicarboxylic-acid to PQQ.