5.3.3.2 isopentenyl diphosphate - 5.3.3.2 isopentenyl diphosphate the enzyme catalyzes a crucial activation step in the isoprenoid biosynthesis pathway 5.3.3.2 isopentenyl diphosphate the enzyme catalyzes the interconversion of the fundamental five carbon homoallylic and allylic diphosphate building blocks required for biosynthesis of isoprenoid compounds 5.3.3.2 isopentenyl diphosphate steady-state equilibrium ratio of isopentenyl diphosphate/dimethylallyl diphosphate of approximately 1:7 5.3.3.2 Isopentenyl diphosphate essential activation step in isoprenoid biosynthetic pathway 5.3.3.2 additional information enzyme of the isoprenoid pathway 5.3.3.2 additional information enzyme in the pathway of conversion of isopentenyl diphosphate to phytoene 5.3.3.2 additional information induced after addition of a homogenate of the phytopathogenic fungus Phytophthora cinnamomi. Enzyme may be involved in the biosynthesis of anthraquinone phytoalexins that accumulate rapidly after elicitation of Cinchona cells 5.3.3.2 additional information key enzyme in biosynthesis of isoprenoids