Dihydroorotase

carbamoyl-phosphate synthetase 2, aspartate transcarbamylase, and dihydroorotase
Dihydroorotase (fragment) dimer, Human
Identifiers
Symbol	CAD
Entrez	790
HUGO	1424
OMIM	114010
RefSeq	NM_004341
UniProt	P27708
Other data
EC number	3.5.2.3
Locus	Chr. 2 p22-p21

Dihydroorotase (EC 3.5.2.3, carbamoylaspartic dehydrase, dihydroorotate hydrolase) is an enzyme which converts carbamoyl aspartic acid into 4,5-dihydroorotic acid in the biosynthesis of pyrimidines.^[1]^[2] It forms a multifunctional enzyme with carbamoyl phosphate synthetase and aspartate transcarboymalase.

References

↑ Cooper, C.; Wilson, D.W. (1954). "Biosynthesis of pyrimidines". Fed. Proc. 13: 194–194.
↑ Lieberman, I.; Kornberg, A. (1954). "Enzymatic synthesis and breakdown of a pyrimidine, orotic acid. II. Dihydroorotic acid, ureidosuccinic acid, and 5-carboxymethylhydantoin" (PDF). J. Biol. Chem. 207: 911–924. PMID 13163076.

External links

Dihydroorotase at the US National Library of Medicine Medical Subject Headings (MeSH)
EC 3.5.2.3

Purine metabolism

Anabolism

R5P→IMP:	Ribose-phosphate diphosphokinase Amidophosphoribosyltransferase Phosphoribosylglycinamide formyltransferase AIR synthetase (FGAM cyclase) Phosphoribosylaminoimidazole carboxylase Phosphoribosylaminoimidazolesuccinocarboxamide synthase IMP synthase

IMP→AMP:	Adenylosuccinate synthase Adenylosuccinate lyase reverse AMP deaminase

IMP→GMP:	IMP dehydrogenase GMP synthase reverse GMP reductase

Nucleotide salvage

Catabolism

Pyrimidine metabolism

Anabolism

CAD Carbamoyl phosphate synthase II Aspartate carbamoyltransferase Dihydroorotase

Dihydroorotate dehydrogenase Orotidine 5'-phosphate decarboxylase/Uridine monophosphate synthetase

CTP synthetase

Catabolism

Deoxyribonucleotides

Enzymes: multienzyme complexes

Photosynthesis	Photosynthetic reaction center complex proteins Photosystem I II

Dehydrogenase	Pyruvate dehydrogenase complex E1 E2 E3 Oxoglutarate dehydrogenase OGDH DLST DLD Branched-chain alpha-keto acid dehydrogenase complex BCKDHA BCKDHB DBT DLD

Other	CAD Carbamoyl phosphate synthase II Aspartate carbamoyltransferase Dihydroorotase Cholesterol side-chain cleavage enzyme Cytochrome b6f complex Electron transport chain Fatty acid synthetase complex Glycine decarboxylase complex Mitochondrial trifunctional protein HADHA HADHB Phosphoenolpyruvate sugar phosphotransferase system Polyketide synthase Sucrase-isomaltase complex Tryptophan synthase

Hydrolases: carbon-nitrogen non-peptide (EC 3.5)

3.5.1: Linear amides / Amidohydrolases	Asparaginase Glutaminase Urease Biotinidase Aspartoacylase Ceramidase Aspartylglucosaminidase Fatty acid amide hydrolase Histone deacetylase Sirtuin

3.5.2: Cyclic amides/ Amidohydrolases	Barbiturase Beta-lactamase

3.5.3: Linear amidines/ Ureohydrolases	Arginase Agmatinase Protein-arginine deiminase

3.5.4: Cyclic amidines/ Aminohydrolases	Guanine deaminase Adenosine deaminase AMP deaminase Inosine monophosphate synthase DCMP deaminase GTP cyclohydrolase I Cytidine deaminase AICDA Activation-induced cytidine deaminase

3.5.5: Nitriles/ Aminohydrolases	Nitrilase

3.5.99: Other	Riboflavinase Thiaminase II

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list)

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Dihydroorotase

References

See also

External links