Reaction catalyzed by phosphoribosylaminoimidazolecarboxamide formyltransferase (2.1.2.3)

		+			=			+
	(6R,6S)-10-formyltetrahydrofolic acid	+		5-amino-4-imidazole carboxamide ribonucleotide	=		tetrahydrofolic acid	+		5-formamido-4-imidazole carboxamide ribonucleotide