isopentenyl pyrophosphate

Isopentenyl pyrophosphate (IPPP) is a crucial intermediate in the biosynthesis of isoprenoids, a diverse group of naturally occurring organic compounds. These compounds are formed from the condensation of five-carbon isoprene units.12

The synthesis of isoprenoids begins with acetyl coenzyme A, which is converted into mevalonic acid. Mevalonic acid is then transformed into isopentenyl pyrophosphate through a series of reactions. IPPP, along with its isomer dimethylallyl pyrophosphate (DMAPP), serves as the building block for larger isoprenoid molecules. For example, two molecules of IPPP combine to form geranyl pyrophosphate, a precursor to monoterpenes. Further condensation leads to farnesyl pyrophosphate and then to diterpenes. Many larger isoprenoids, such as triterpenes and tetraterpenes (like carotenoids), are formed by the coupling of these larger isoprenoid precursors. Cholesterol, steroid hormones, and vitamins A, D, E, and K are all examples of important biological molecules derived from isoprenoids.12