8-oxoguanine deaminase activity
Catalysis of the reaction: H+ + 7,8-dihydro-8-oxoguanine + H2O = 7,9-dihydro-1H-purine-2,6,8(3H)-trione + ammonium.
GO:0016814
hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds, in cyclic amidines
is_a