Involved in the biosynthesis of the chorismate, which leads to the biosynthesis of aromatic amino acids. Catalyzes the reversible NADPH linked reduction of 3-dehydroshikimate (DHSA) to yield shikimate (SA). It can also use NAD to oxidize shikimate. NADP(+) + shikimate = 3-dehydroshikimate + H(+) + NADPH Inhibited by curcumin, 3-(2-naphthyloxy)-4-oxo-2-(trifluoromethyl)-4H-chromen-7-yl 3-chlorobenzoate, butyl 2-{[3-(2-naphthyloxy)-4-oxo-2-(trifluoromethyl)-4H-chromen-7-yl]oxy}propanoate, 2-({2-[(2-{[2-(2,3-dimethylanilino)-2-oxoethyl]sulfanyl}-1,3-benzothiazol-6-yl)amino]-2-oxoethyl}sulfanyl)-N-(2-naphthyl)acetamide, and maesaquinone diacetate. kcat is 5.2 sec(-1) for dehydrogenase activity with NAD (at pH 8 and 25 degrees Celsius). kcat is 7.1 sec(-1) for dehydrogenase activity with NADP (at pH 8 and 25 degrees Celsius). kcat is 7.7 sec(-1) for dehydrogenase activity with shikimate (at pH 8 and 25 degrees Celsius). Optimum pH is between 8 and 9. Optimum temperature is 60 degrees Celsius. Metabolic intermediate biosynthesis; chorismate biosynthesis; chorismate from D-erythrose 4-phosphate and phosphoenolpyruvate: step 4/7. Homodimer. Belongs to the shikimate dehydrogenase family.