Reaction catalyzed by glutamate formimidoyltransferase (2.1.2.5)

		+			=			+
	N-formimidoyl-L-Glu-L-Glu-L-Glu	+		tetrahydrofolate	=		N-formimidoyl-L-Glu-L-Glu	+		5-formimidoyltetrahydrofolate