This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amides. The systematic name of this enzyme class is 3-(5-oxo-4,5-dihydro-3H-imidazol-4-yl)propanoate amidohydrolase. Other names in common use include 4(5)-imidazolone-5(4)-propionic acid hydrolase, and imidazolone propionic acid hydrolase. This enzyme participates in histidine metabolism.
Rao DR; Greenberg DM (1961). "Studies on the enzymic decomposition of urocanic acid. IV Purification and properties of 4(5)-imidazolone-5(4)-propionic acid hydrolase". J. Biol. Chem. 236: 1758–1763. PMID13739526.
Snyder SH, Silva OL, Kies MW (1961). "The mammalian metabolism of L-histidine. IV. Purification and properties of imidazolone propionic acid hydrolase". J. Biol. Chem. 236: 2996–2998. PMID13914653.