Catalyzes a trans-dehydration via an enolate intermediate. Is involved in both the catabolism of quinate and the biosynthesis of aromatic amino acids. 3-dehydroquinate = 3-dehydroshikimate + H2O Optimum pH is 9.0. Optimum temperature is 76 degrees Celsius. Thermostable. 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.