Is involved in the catabolism of quinate. Allows the utilization of quinate as carbon source via the beta-ketoadipate pathway. 3-dehydroquinate = 3-dehydroshikimate + H2O Aromatic compound metabolism; 3,4-dihydroxybenzoate biosynthesis; 3,4-dihydroxybenzoate from 3-dehydroquinate: step 1/2. Homododecamer. Adopts a ring-like structure, composed of an arrangement of two hexameric rings stacked on top of one another. Belongs to the type-II 3-dehydroquinase family.