5.3.3.2	physiological function	isopentenyl diphosphate and dimethylallyl diphosphate are essential precursors for terpenoid biosynthesis	706249	
5.3.3.2	physiological function	involved in terpenoid metabolism	706809	
5.3.3.2	metabolism	IPP isomerase activity is a rate-limiting step in terpenoid synthesis	727103	
5.3.3.2	metabolism	the enzyme plays a critical role in terpenoid metabolic pathways	748714	
5.3.3.2	metabolism	the plastidial enzyme plays an important function in carotenoid biosynthesis	748953