Reaction catalyzed by dihydroorotate dehydrogenase (quinone) (1.3.5.2)
+
=
+
reduced 2,6-dihydrophenolindophenol
(S)-dihydroorotate
+
2,6-dihydrophenolindophenol
=
orotate
+
reduced 2,6-dihydrophenolindophenol