1.3.98.1	(S)-dihydroorotate + acceptor	fourth step in synthesis of pyrimidine nucleotides	
1.3.98.1	(S)-dihydroorotate + acceptor	fourth step in UMP-biosynthesis	
1.3.98.1	(S)-dihydroorotate + fumarate	-	
1.3.98.1	(S)-dihydroorotate + fumarate	enzyme is responsible for biosynthesis of succinate and orotate	
1.3.98.1	(S)-dihydroorotate + O2	pathway of pyrimidine biosynthesis, constitutive biosynthetic enzyme	
1.3.98.1	L-dihydroorotate + fumarate	-	
1.3.98.1	L-dihydroorotate + fumarate	DHODH catalyzes a coupled redox reaction in which dihydroorotate is oxidized to orotate and fumarate is reduced to succinate