ID 3.5.4.8 DE aminoimidazolase. AN 4-aminoimidazole deaminase. CA 4-aminoimidazole + H(+) + H2O = imidazol-4-one + NH4(+). CC -!- Forms part of the xanthine-degradation pathway in some bacteria. CC -!- The product of the reaction, imidazol-4-one, can be converted non- CC enzymically into formiminoglycine. //