Fructose and glucose phosphorylating enzyme. ATP + D-hexose = ADP + D-hexose 6-phosphate + H(+) ATP + D-fructose = ADP + D-fructose 6-phosphate + H(+) ATP + D-glucose = ADP + D-glucose 6-phosphate + H(+) Carbohydrate metabolism; hexose metabolism. Carbohydrate degradation; glycolysis; D-glyceraldehyde 3-phosphate and glycerone phosphate from D-glucose: step 1/4. Expressed in roots, leaves, flowers, immature seeds, endosperm and seed coat. Expressed during flower development until 8 days after flowering. Not induced by glucose or fructose treatment in leaves. Belongs to the hexokinase family.