ID 6.3.4.8 DE imidazoleacetate--phosphoribosyldiphosphate ligase. AN 5-phosphoribosylimidazoleacetate synthetase. CA 5-phospho-alpha-D-ribose 1-diphosphate + ATP + H2O + imidazole-4-acetate CA = 1-(5-phosphoribosyl)imidazole-4-acetate + ADP + diphosphate + H(+) + CA phosphate. //