Reaction catalyzed by SAMP-activating enzyme (2.7.7.100), E1 SAMP-activating enzyme (6.2.1.55)

	ATP	+		[SAMP]-Gly-Gly	=			+		[SAMP]-Gly-Gly-AMP
	ATP	+		[SAMP]-Gly-Gly	=		diphosphate	+		[SAMP]-Gly-Gly-AMP