Catalyzes a trans-dehydration via an enolate intermediate. 3-dehydroquinate = 3-dehydroshikimate + H2O Metabolic intermediate biosynthesis; chorismate biosynthesis; chorismate from D-erythrose 4-phosphate and phosphoenolpyruvate: step 3/7. Homododecamer. Belongs to the type-II 3-dehydroquinase family.