tokens: In simpler organisms , the ATP sulfurylase and APS kinase reactions are catalyzed by separate enzymes encoded by two or three genes , suggesting that a fusion of separate genes during the course of evolution generated the bifunctional enzyme .
folded_tokens: in simpler organism , the atp sulfurylase and ap kinase reaction be catalyze by separate enzyme encode by two or three gene , suggest that a fusion of separate gene during the course of evolution generate the bifunctional enzyme .