Inosine monophosphate synthase

Bifunctional purine biosynthesis protein PURH is a protein that in humans is encoded by the ATIC gene.

ATIC encodes an enzyme which generates inosine monophosphate from aminoimidazole carboxamide ribonucleotide.

It has two functions:


 * - 5-aminoimidazole-4-carboxamide ribonucleotide formyltransferase
 * - IMP cyclohydrolase