Reaction catalyzed by phosphoribosylaminoimidazolecarboxamide formyltransferase (2.1.2.3)

		+			=			+
	10-formyl-7,8-dihydrofolate	+		5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxamide	=		dihydrofolate	+		5-formamido-1-(5-phospho-D-ribosyl)imidazole-4-carboxamide