Phosphoketolase using both fructose 6-phosphate and xylulose 5-phosphate as substrate. D-xylulose 5-phosphate + phosphate = acetyl phosphate + D-glyceraldehyde 3-phosphate + H2O keto-D-fructose 6-phosphate + phosphate = acetyl phosphate + D-erythrose 4-phosphate + H2O Homohexamer. Belongs to the XFP family.