Reaction catalyzed by 1-deoxy-D-xylulose-5-phosphate reductoisomerase (1.1.1.267)

		+		NADPH	=			+		NADP+
	1-deoxy-D-xylulose-5-phosphate	+		NADPH	=		methyl-D-erythritol-4-phosphate	+		NADP+