The enzyme phosphoketolase(EC 4.1.2.9) catalyzes the chemical reactionsD-xylulose 5-phosphate + phosphate acetyl phosphate + D-glyceraldehyde 3-phosphate + H2O (EC 4.1.2.9) D-fructose 6-phosphate + phosphate acetyl phosphate + D-erythrose 4-phosphate + H2O (EC 4.1.2.22) D-sedoheptulose 7-phosphate + phosphate acetyl phosphate + D-ribose 5-phosphate + H2O