IMP cyclohydrolase

In enzymology, an IMP cyclohydrolase is an enzyme that catalyzes the chemical reaction


 * IMP + H2O $$\rightleftharpoons$$ 5-formamido-1-(5-phospho-D-ribosyl)imidazole-4-carboxamide

Thus, the two substrates of this enzyme are IMP and H2O, whereas its product is 5-formamido-1-(5-phospho-D-ribosyl)imidazole-4-carboxamide.

This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amidines. The systematic name of this enzyme class is IMP 1,2-hydrolase (decyclizing). Other names in common use include inosinicase, and inosinate cyclohydrolase. This enzyme participates in purine metabolism.

Structural studies
As of late 2007, 14 structures have been solved for this class of enzymes, with PDB accession codes, , , , , , , , , , , , , and.