diaminohydroxyphosphoribosylaminopyrimidine deaminase activity

Catalysis of the reaction: 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine + H(2)O + H(+) = 5-amino-6-(5-phosphoribosylamino)uracil + NH(4)(+).

Source:http://purl.uniprot.org/go/0008835

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