Reaction catalyzed by dihydroorotate dehydrogenase (quinone) (1.3.5.2)

		+			=			+
	dihydroorotate	+		2,3-dimethoxy-5-methyl-1,4-benzoquinone	=		orotate	+		reduced 2,3-dimethoxy-5-methyl-1,4-benzoquinone