Inosine Diphosphoric Acid

Inosine diphosphoric acid (IDP; synonym: inosine diphosphate) is an organic compound belonging to the class of purine nucleotides. It is an ester of phosphoric acid and inosine nucleoside.

IDP plays an important role in the metabolism of purine nucleotides, participating in the biosynthesis of adenosine triphosphate (ATP) and guanosine triphosphate (GTP). It is formed as a result of deamination of adenosine monophosphate (AMP) by the enzyme AMP deaminase.

IDP can be re-aminated by the enzyme adenosine monophosphate aminase to form AMP. IDP can also be converted into GMP by amination by the enzyme guanine monophosphate synthetase.

Thus, inosine diphosphoric acid plays a key role in the interconversion of purine nucleotides and the maintenance of purine in cells.