Reaction catalyzed by 5'-(N7-methylguanosine 5'-triphospho)-[mRNA] hydrolase (3.6.1.62)

	m7G5\'ppp5\'-U3 snoRNA	+		H2O	=			+		5\'-phospho-U3 snoRNA
	m7G5'ppp5'-U3 snoRNA	+		H2O	=		m7GDP	+		5'-phospho-U3 snoRNA