Reaction catalyzed by dihydroorotate dehydrogenase (quinone) (1.3.5.2), dihydroorotate dehydrogenase (fumarate) (1.3.98.1)

		+			=			+
	dihydroorotate	+		2,6-dichlorophenolindophenol	=		orotate	+		reduced 2,6-dichlorophenolindophenol