Reaction catalyzed by phosphoribosylaminoimidazolecarboxamide formyltransferase (2.1.2.3)

		+			=			+
	10-formyl-7,8-dihydropteroylpenta-gamma-L-glutamate	+		5'-phosphoribosyl-5-amino-4-imidazolecarboxamide	=		dihydrofolic acid pentaglutamate	+		5'-phosphoribosyl-5-formamido-4-imidazolecarboxamide