Can act either on quinate or on shikimate. a quinone + L-quinate = 3-dehydroquinate + a quinol a quinone + shikimate = 3-dehydroshikimate + a quinol Aromatic compound metabolism; 3,4-dihydroxybenzoate biosynthesis; 3-dehydroquinate from D-quinate (PQQ route): step 1/1. By protocatechuate. Belongs to the bacterial PQQ dehydrogenase family.