Reaction catalyzed by DNA-formamidopyrimidine glycosylase (3.2.2.23)

	DNA containing ring-opened N7-methylguanine residues	+		H2O	=			+
	DNA containing ring-opened N7-methylguanine residues	+		H2O	=		2,6-diamino-4-hydroxy-5-N-methylformamidopyrimidine	+		DNA