Reaction catalyzed by dihydroorotate dehydrogenase (quinone) (1.3.5.2)

		+			=			+		reduced 2,6-dihydrophenolindophenol
	L-dihydroorotate	+		2,6-dihydrophenolindophenol	=		orotate	+		reduced 2,6-dihydrophenolindophenol