List of enzymes

This page lists enzymes by their classification in the International Union of Biochemistry and Molecular Biology's Enzyme Commission [EC] numbering system. For a list of the EC numbers themselves, see:

• List of EC numbers (EC 1)
• List of EC numbers (EC 2)
• List of EC numbers (EC 3)
• List of EC numbers (EC 4)
• List of EC numbers (EC 5)
• List of EC numbers (EC 6)

Category:Oxidoreductases (EC 1) (Oxidoreductase)

• Dehydrogenase
• Luciferase
• DMSO reductase

Category:EC 1.1 (act on the CH-OH group of donors)

• Category:EC 1.1.1 (with NAD⁺ or NADP⁺ as acceptor)
  • Alcohol dehydrogenase (NAD) EC 1.1.1.1
  • Alcohol dehydrogenase (NADP) EC 1.1.1.2
  • Homoserine dehydrogenase EC 1.1.1.3
  • Aminopropanol oxidoreductase EC 1.1.1.4
  • Diacetyl reductase EC 1.1.1.5
  • Glycerol dehydrogenase EC 1.1.1.6
  • Propanediol-phosphate dehydrogenase EC 1.1.1.7
  • glycerol-3-phosphate dehydrogenase (NAD+) EC 1.1.1.8
  • D-xylulose reductase EC 1.1.1.9
  • L-xylulose reductase EC 1.1.1.10
  • Lactate dehydrogenase EC 1.1.1.27
  • Malate dehydrogenase EC 1.1.1.37
  • Isocitrate dehydrogenase EC 1.1.1.42
  • HMG-CoA reductase EC 1.1.1.88
• Category:EC 1.1.2 (with a cytochrome as acceptor)
• Category:EC 1.1.3 (with oxygen as acceptor)
  • Glucose oxidase EC 1.1.3.4
  • L-gulonolactone oxidase EC 1.1.3.8
  • Thiamine oxidase EC 1.1.3.23
  • Xanthine oxidase EC 1.1.3.32
• Category:EC 1.1.4 (with a disulfide as acceptor)
• Category:EC 1.1.5 (with a quinone or similar compound as acceptor)
• Category:EC 1.1.99 (with other acceptors)

Category:EC 1.2 (act on the aldehyde or oxo group of donors)

• Category:EC 1.2.1 (with NAD⁺ or NADP⁺ as acceptor)
  • Acetaldehyde dehydrogenase EC 1.2.1.10
  • Glyceraldehyde 3-phosphate dehydrogenase EC 1.2.1.12
  • Pyruvate dehydrogenase EC 1.2.1.51
• Category:EC 1.2.4
  • Oxoglutarate dehydrogenase EC 1.2.4.2

Category:EC 1.3 (act on the CH-CH group of donors)

• Category:EC 1.3.1 (with NAD⁺ or NADP⁺ as acceptor)
  • Biliverdin reductase EC 1.3.1.24
• Category:EC 1.3.2 (with a cytochrome as acceptor)
• Category:EC 1.3.3 (with oxygen as acceptor)
  • Protoporphyrinogen oxidase EC 1.3.3.4
• Category:EC 1.3.5 (with a quinone or similar compound as acceptor)
• Category:EC 1.3.7 (with an iron-sulfur protein as acceptor)
• Category:EC 1.3.99 (with other acceptors)

Category:EC 1.4 (act on the CH-NH₂ group of donors)

• Category:EC 1.4.3
  • Monoamine oxidase EC 1.4.3.4

Category:EC 1.5 (act on CH-NH group of donors)

• Category:EC 1.5.1 (with NAD⁺ or NADP⁺ as acceptor)
  • Dihydrofolate reductase EC 1.5.1.3
  • Methylenetetrahydrofolate reductase EC 1.5.1.20
• Category:EC 1.5.3 (with oxygen as acceptor)
  • Sarcosine oxidase EC 1.5.3.1
  • Dihydrobenzophenanthridine oxidase EC 1.5.3.12
• Category:EC 1.5.4 (with a disulfide as acceptor)
• Category:EC 1.5.5 (with a quinone or similar compound as acceptor)
• Category:EC 1.5.7 (with an iron-sulfur protein as acceptor)
• Category:EC 1.5.8 (with a flavin as acceptor)
• Category:EC 1.5.99 (with other acceptors)

Category:EC 1.6 (act on NADH or NADPH)

• Category:EC 1.6.1 (with NAD⁺ or NADP⁺ as acceptor)
• Category:EC 1.6.2 (with a cytochrome as acceptor)
• Category:EC 1.6.3 (with oxygen as acceptor)
• Category:EC 1.6.4 now Category:EC 1.8.1
• Category:EC 1.6.5 (with a quinone or similar compound as acceptor)
  • NADH dehydrogenase EC 1.6.5.3
• Category:EC 1.6.6 (with a nitrogenous group as acceptor)
• Category:EC 1.6.7 now Category:EC 1.18.1
• Category:EC 1.6.8 now Category:EC 1.5.1
• Category:EC 1.6.99 (with other acceptors)

Category:EC 1.7 (act on other nitrogenous compounds as donors)

• Category:EC 1.7.1 (with NAD⁺ or NADP⁺ as acceptor)
• Category:EC 1.7.2 (with a cytochrome as acceptor)
• Category:EC 1.7.3 (with oxygen as acceptor)
  • Urate oxidase EC 1.7.3.3
• Category:EC 1.7.7 (with an iron-sulfur protein as acceptor)
• Category:EC 1.7.99 (with other acceptors)
  • Nitrite reductase EC 1.7.99.3
  • Nitrate reductase EC 1.7.99.4

Category:EC 1.8 (act on a sulfur group of donors)

• Category:EC 1.8.1 (with NAD⁺ or NADP⁺ as acceptor)
  • Glutathione reductase EC 1.8.1.7
  • Thioredoxin reductase EC 1.8.1.9
• Category:EC 1.8.2 (with a cytochrome as acceptor)
• Category:EC 1.8.3 (with oxygen as acceptor)
  • Sulfite oxidase EC 1.8.3.1
• Category:EC 1.8.4 (with a disulfide as acceptor)
• Category:EC 1.8.5 (with a quinone or similar compound as acceptor)
• Category:EC 1.8.6 deleted, included in EC 2.5.1.18
• Category:EC 1.8.7 (with an iron-sulfur protein as acceptor)
• Category:EC 1.8.98 (with other, known, acceptors)
• Category:EC 1.8.99 (with other acceptors)

Category:EC 1.9 (act on a heme group of donors)

• Category:EC 1.9.3 (with oxygen as acceptor)
  • Cytochrome c oxidase EC 1.9.3.1
• Category:EC 1.9.6 (with a nitrogenous as acceptor)
• Category:EC 1.9.99 transferred, now EC 1.9.98.1

Category:EC 1.10 (act on diphenols and related substances as donors)

• Category:EC 1.10.1(with NAD⁺ or NADP⁺ as acceptor)
• Category:EC 1.10.2 (with a cytochrome as acceptor)
  • Coenzyme Q - cytochrome c reductase EC 1.10.2.2
• Category:EC 1.10.3 (with oxygen as acceptor)
  • Catechol oxidase EC 1.10.3.1
  • Laccase EC 1.10.3.2
• Category:EC 1.10.99 (with other acceptors)

Category:EC 1.11 (act on peroxide as an acceptor -- peroxidases)

• Category:EC 1.11.1 (peroxidases)
  • Cytochrome c peroxidase EC 1.11.1.5
  • Catalase EC 1.11.1.6
  • Myeloperoxidase EC 1.11.1.7
  • Thyroid peroxidase EC 1.11.1.8
  • Glutathione peroxidase EC 1.11.1.9

Category:EC 1.12 (act on hydrogen as a donor)

• Category:EC 1.12.1 (with NAD⁺ or NADP⁺ as acceptor)
• Category:EC 1.12.2 (with a cytochrome as acceptor)
• Category:EC 1.12.5 (with a quinone or similar compound as acceptor)
• Category:EC 1.12.7 (with an iron-sulfur protein as acceptor)
• Category:EC 1.12.98 (with other known acceptors)
• Category:EC 1.12.99 (with other acceptors)

Category:EC 1.13 (act on single donors with incorporation of molecular oxygen)

• Category:EC 1.13.11 (With incorporation of two atoms of oxygen)
  • 4-hydroxyphenylpyruvate dioxygenase (EC 1.13.11.27)
• Category:EC 1.13.12 (With incorporation of one atom of oxygen (internal monooxygenases or internal mixed function oxidases))
  • Renilla-luciferin 2-monooxygenase EC 1.13.12.5
  • Cypridina-luciferin 2-monooxygenase EC 1.13.12.6
  • Firefly luciferase EC 1.13.12.7
  • Watasenia-luciferin 2-monooxygenase EC 1.13.12.8
  • Oplophorus-luciferin 2-monooxygenase EC 1.13.12.13

Category:EC 1.14 (act on paired donors with incorporation of molecular oxygen)

• Cytochrome P450 oxidase
• Category:Cytochrome P450
  • Aromatase EC 1.14.14.1
  • CYP2D6 EC 1.14.14.1
  • CYP2E1 EC 1.14.14.1
  • CYP3A4 EC 1.14.14.1
  • Cytochrome P450 oxidase
• Category:EC 1.14.12
  • Nitric oxide dioxygenase
• Category:EC 1.14.13
  • Nitric oxide synthase EC 1.14.13.39
• Category:EC 1.14.14
  • Aromatase EC 1.14.14.1
  • CYP2D6 EC 1.14.14.1
  • CYP2E1 EC 1.14.14.1
  • CYP3A4 EC 1.14.14.1
• Category:EC 1.14.16
  • Phenylalanine hydroxylase EC 1.14.16.1
• Category:EC 1.14.18
  • Tyrosinase EC 1.14.18.1

Category:EC 1.15 (act on superoxide radicals as acceptors)

• Category:EC 1.15.1
  • Superoxide dismutase EC 1.15.1.1

Category:EC 1.16 (oxidize metal ions)

• Category:EC 1.16.3
  • Ceruloplasmin EC 1.16.3.1

Category:EC 1.17 (act on CH or CH₂ groups)

• Category:EC 1.17.1
  • Leucoanthocyanidin reductase EC 1.17.1.3
  • Xanthine dehydrogenase EC 1.17.1.4
  • Nicotinate dehydrogenase EC 1.17.1.5
  • 4-hydroxy-tetrahydrodipicolinate reductase EC 1.17.1.8
• Category:EC 1.17.2
  • Nicotinate dehydrogenase (cytochrome) EC 1.17.2.1
• Category:EC 1.17.3
  • Xanthine oxidase EC 1.17.3.2
• Category:EC 1.17.4
  • Ribonucleotide reductase EC 1.17.4.1
  • Ribonucleoside-triphosphate reductase EC 1.17.4.2
  • Vitamin K epoxide reductase
  • Vitamin-K-epoxide reductase (warfarin-sensitive) EC 1.17.4.4
  • Vitamin-K-epoxide reductase (warfarin-insensitive) EC 1.17.4.5
  • RRM1
  • RRM2
  • RRM2B
• Category:EC 1.17.5
  • Caffeine dehydrogenase EC 1.17.5.2
• Category:EC 1.17.7
• Category:EC 1.17.99

Category:EC 1.18 (act on iron-sulfur proteins as donors)

• Category:EC 1.18.6
  • Nitrogenase EC 1.18.6.1

Category:EC 1.19 (act on reduced flavodoxin as donor)

• Category:EC 1.19.6
  • Nitrogenase (flavodoxin) EC 1.19.6.1

Category:EC 1.20 (act on phosphorus or arsenic as donors)

• Category:EC 1.20.1
• Category:EC 1.20.2
• Category:EC 1.20.4
  • Arsenate reductase (glutaredoxin) EC 1.20.4.1
  • Glutaredoxin
• Category:EC 1.20.9
• Category:EC 1.20.99

Category:EC 1.21 (act on X-H and Y-H to form an X-Y bond)

• Category:EC 1.21.1
  • Iodotyrosine deiodinase EC 1.21.1.1
• Category:EC 1.21.3
  • Isopenicillin N synthase EC 1.21.3.1
  • Tetrahydrocannabinolic acid synthase EC 1.21.3.7
• Category:EC 1.21.4
• Category:EC 1.21.99
  • Thyroxine 5-deiodinase EC 1.21.99.3
  • Iodothyronine deiodinase EC 1.21.99.3 and EC 1.21.99.4

Category:EC 1.97 (other oxidoreductases)

• Category:EC 1.97.1
  • Deiodinase EC 1.97.1.10

Category:Transferases (EC 2) (Transferase)

• Glutathione S-transferase

Category:EC 2.1 (transfer one-carbon groups, Methylase)

• Category:EC 2.1.1
  • Catechol-O-methyl transferase EC 2.1.1.6
  • DNA methyltransferase EC 2.1.1.72, EC 2.1.1.113, EC 2.1.1.37
  • Histone methyltransferase EC 2.1.1.43, EC 2.1.1.125
• Category:EC 2.1.3
  • Aspartate transcarbamoylase EC 2.1.3.2
  • Ornithine transcarbamoylase EC 2.1.3.3

Category:EC 2.2 (transfer aldehyde or ketone groups)

• Category:EC 2.2.1
  • Transketolase EC 2.2.1.1
  • Transaldolase EC 2.2.1.2
  • Acetolactate synthase EC 2.2.1.6
  • 2-Succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylic-acid synthase EC 2.2.1.9

Category:EC 2.3 (acyltransferases)

• Category:EC 2.3.1
  • Aminolevulinic acid synthase EC 2.3.1.37
  • Choline acetyltransferase EC 2.3.1.6
• Category:EC 2.3.2
  • Factor XIII EC 2.3.2.13
  • Gamma glutamyl transpeptidase EC 2.3.2.2
  • Transglutaminase EC 2.3.2.13

Category:EC 2.4 (glycosyltransferases)

• Category:EC 2.4.2
  • Hypoxanthine-guanine phosphoribosyltransferase EC 2.4.2.8

Category:EC 2.5

• Category:EC 2.5.1
  • Thiaminase EC 2.5.1.2

Category:EC 2.5 (transfer alkyl or aryl groups, other than methyl groups)

• • Flavin prenyltransferase EC 2.5.1.129

Category:EC 2.6 (transfer nitrogenous groups)

• Category:EC 2.6.1
  • Alanine transaminase EC 2.6.1.2
  • Aspartate transaminase EC 2.6.1.1

Category:EC 2.7 (transfer phosphorus-containing groups)

• Category:EC 2.7.2
  • Butyrate kinase (EC 2.7.2.7)

Category:EC 2.8 (transfer sulfur-containing groups)

• EC 2.8.1.1: Thiosulfate sulfurtransferase
• EC 2.8.1.2: 3-mercaptopyruvate sulfurtransferase
• EC 2.8.1.3: Thiosulfate--thiol sulfurtransferase
• EC 2.8.1.4: tRNA uracil 4-sulfurtransferase
• EC 2.8.1.5: Thiosulfate--dithiol sulfurtransferase
• EC 2.8.1.6: Biotin synthase
• EC 2.8.1.7: Cysteine desulfurase
• EC 2.8.1.8: Lipoyl synthase
• EC 2.8.1.9: Molybdenum cofactor sulfurtransferase
• EC 2.8.1.10: Thiazole synthase
• EC 2.8.1.11: Molybdopterin synthase sulfurtransferase
• EC 2.8.1.12: Molybdopterin synthase
• EC 2.8.1.13: tRNA-uridine 2-sulfurtransferase
• EC 2.8.1.14: tRNA-5-taurinomethyluridine 2-sulfurtransferase
• EC 2.8.1.15: tRNA-5-methyluridine(54) 2-sulfurtransferase

Category:EC 2.9 (transfer selenium-containing groups)

• EC 2.9.1.1: L-seryl-tRNA(Sec) selenium transferase
• EC 2.9.1.2: O-phospho-L-seryl-tRNA(Sec):L-selenocysteinyl-tRNA synthase

Category:Hydrolases (EC 3) (Hydrolase)

• Hydrolytic enzyme

Category:EC 3.1 (act on ester bonds)

• Nuclease
• Endonuclease
• Exonuclease
• Category:EC 3.1.1
  • Acid hydrolase
  • Phospholipase A (EC 3.1.1.4)
  • Acetylcholinesterase (EC 3.1.1.7)
  • Cholinesterase (EC 3.1.1.8)
  • Lipoprotein lipase (EC 3.1.1.34)
• Category:EC 3.1.2
  • Ubiquitin carboxy-terminal hydrolase L1 (EC 3.1.2.15)
• Category:EC 3.1.3
  • Phosphatase
  • Alkaline phosphatase (EC 3.1.3.1)
  • Fructose bisphosphatase (EC 3.1.3.11)
• Category:EC 3.1.4
  • Phospholipase C (EC 3.1.4.3)
  • CGMP specific phosphodiesterase type 5 (EC 3.1.4.17)
  • Phospholipase D (EC 3.1.4.50)
• Category:EC 3.1.21
  • Restriction enzyme Type 1 (EC 3.1.21.3)
  • Restriction enzyme Type 2 (EC 3.1.21.4)
  • Restriction enzyme Type 3 (EC 3.1.21.5)
  • Restriction enzyme Type 4 (?)
  • Deoxyribonuclease I (EC 3.1.21.1)
• Category:EC 3.1.26
  • RNase H (EC 3.1.26.4)
• Category:EC 3.1.27
  • Ribonuclease

Category:EC 3.2 (act on sugars - glycosylases)

• Category:EC 3.2.1
  • Amylase (EC 3.2.1.1)
  • Sucrase (EC 3.2.1.10)
  • Chitinase (EC 3.2.1.14)
  • Lysozyme (EC 3.2.1.17)
  • Maltase (EC 3.2.1.20)
  • Lactase (EC 3.2.1.23)
  • Beta-galactosidase (EC 3.2.1.23)
  • Hyaluronidase (EC 3.2.1.35)

Category:EC 3.3 (act on ether bonds)

• Category:EC 3.3
• Adenosylmethionine hydrolase
• S-adenosyl-L-homocysteine hydrolase
• Alkenylglycerophosphocholine hydrolase
• Alkenylglycerophosphoethanolamine hydrolase
• Cholesterol-5,6-oxide hydrolase
• Hepoxilin-epoxide hydrolase
• Isochorismatase
• Leukotriene-A4 hydrolase
• Limonene-1,2-epoxide hydrolase
• Microsomal epoxide hydrolase
• Trans-epoxysuccinate hydrolase

Category:EC 3.4 (act on peptide bonds - Peptidase)

• Category:EC 3.4.11
  • Alanine aminopeptidase
• Category:EC 3.4.15
  • Angiotensin converting enzyme
• Category:EC 3.4.21
  • Serine protease
  • Chymotrypsin (EC 3.4.21.1)
  • Trypsin (EC 3.4.21.4)
  • Thrombin (EC 3.4.21.5)
  • Factor X (EC 3.4.21.6)
  • Plasmin (EC 3.4.21.7)
  • Acrosin (EC 3.4.21.10)
  • Factor VII (EC 3.4.21.21)
  • Factor IX (EC 3.4.21.22)
  • Prolyl oligopeptidase (EC 3.4.21.26)
  • Factor XI (EC 3.4.21.27)
  • Elastase (EC 3.4.21.37)
  • Factor XII (EC 3.4.21.38)
  • Proteinase K (EC 3.4.21.64)
  • Tissue plasminogen activator (EC 3.4.21.68)
  • Protein C (EC 3.4.21.69)
• Category:EC 3.4.22
  • Separase (EC 3.4.22.49)
• Category:EC 3.4.23
  • Pepsin (EC 3.4.23.1)
  • Rennet (EC 3.4.23.4)
  • Renin (EC 3.4.23.15)
  • Trypsinogen (EC 3.4.23.18) and (20/21/23/24/26)
  • Plasmepsin (EC 3.4.23.39)
• Category:EC 3.4.24
  • Matrix metalloproteinase (EC 3.4.24.7)
• Category:EC 3.4.25
  • Metalloendopeptidase

Category:EC 3.5 (act on carbon-nitrogen bonds, other than peptide bonds)

• Category:EC 3.5.1 (In linear amides)
  • Urease (EC 3.5.1.5)
• Category:EC 3.5.2 (In cyclic amides)
  • Beta-lactamase (EC 3.5.2.6)
• Category:EC 3.5.3 (In linear amidines)
  • Arginase (EC 3.5.3.1)
• Category:EC 3.5.4 (In cyclic amidines)
  • Adenosine deaminase (EC 3.5.4.4)
  • GTP cyclohydrolase I (EC 3.5.4.16)
• Category:EC 3.5.5 (In nitriles)
  • Nitrilase (EC 3.5.5.1)

Category:EC 3.6 (act on acid anhydrides)

• Category:EC 3.6.1
  • Helicase
  • DnaB helicase
  • RecQ helicase
• Category:EC 3.6.3
  • ATPase
  • NaKATPase (EC 3.6.3.9)
  • ATP synthase (EC 3.6.3.14)

Category:EC 3.7 (act on carbon-carbon bonds)

• Kynureninase EC 3.7.1.3

Category:EC 3.8 (act on halide bonds)

• EC 3.8.1.3 Haloacetate dehalogenase

Category:EC 3.9 (act on phosphorus-nitrogen bonds)

• EC 3.9.1.1: Phosphoamidase
• EC 3.9.1.2: Protein arginine phosphatase
• EC 3.9.1.3: Phosphohistidine phosphatase

Category:EC 3.10 (act on sulfur-nitrogen bonds)

• EC 3.10.1.1: N-sulfoglucosamine sulfohydrolase
• EC 3.10.1.2: Cyclamate sulfohydrolase

Category:EC 3.11 (act on carbon-phosphorus bonds)

• EC 3.11.1.1: Phosphonoacetaldehyde hydrolase
• EC 3.11.1.2: Phosphonoacetate hydrolase
• EC 3.11.1.3: Phosphonopyruvate hydrolase

Category:EC 3.12 (act on sulfur-sulfur bonds)

• EC 3.12.1.1: Trithionate hydrolase

Category:EC 3.13 (act on carbon-sulfur bonds)

• EC 3.13.1.1: UDP-sulfoquinovose synthase
• EC 3.13.1.3: 2'-hydroxybiphenyl-2-sulfinate desulfinase
• EC 3.13.1.4: 3-sulfinopropanoyl-CoA desulfinase
• EC 3.13.1.5: Carbon disulfide hydrolase
• EC 3.13.1.6: (CysO sulfur-carrier protein)-S-L-cysteine hydrolase
• EC 3.13.1.7: Carbonyl sulfide hydrolase
• EC 3.13.1.8: S-adenosyl-L-methionine hydrolase (adenosine-forming)

Category:Lyases (EC 4) (Lyase)

Category:EC 4.1 (carbon-carbon lyases)

• Category:EC 4.1.1
  • Ornithine decarboxylase (EC 4.1.1.17)
  • Uridine monophosphate synthetase (EC 4.1.1.23)
  • Aromatic-L-amino-acid decarboxylase (EC 4.1.1.28)
  • RubisCO (EC 4.1.1.39)
• Category:EC 4.1.2
  • Fructose-bisphosphate aldolase (EC 4.1.2.13)

Category:EC 4.2 (carbon-oxygen lyases)

• Category:EC 4.2.1
  • Carbonic anhydrase (EC 4.2.1.1)
  • Tryptophan synthase (EC 4.2.1.20)

Category:EC 4.3 (carbon-nitrogen lyases)

• Category:EC 4.3.1
  • Phenylalanine ammonia-lyase (EC 4.3.1.24)

Category:EC 4.4 (carbon-sulfur lyases)

• Category:EC 4.4.1
  • Cystathionine gamma-lyase
  • Cystathionine beta-lyase
  • Leukotriene C4 synthase

Category:EC 4.5 (carbon-halide lyases)

• Category:EC 4.5.1
  • Dichloromethane dehalogenase
  • Halohydrin dehalogenase

Category:EC 4.6 (phosphorus-oxygen lyases)

• Category:EC 4.6.1
  • Adenylate cyclase (EC 4.6.1.1)
  • Guanylate cyclase (EC 4.6.1.2)

Category:Isomerases (EC 5) (Isomerase)

Category:EC 5.1 (racemases and epimerases)

• Category:EC 5.1.1
• Amino-acid racemase: Phenylalanine racemase (ATP-hydrolysing)
• Serine racemase
• Category:EC 5.1.2
• Mandelate racemase
• Category:EC 5.1.3
• UDP-glucose 4-epimerase
• Category:EC 5.1.99
• Methylmalonyl CoA epimerase

Category:EC 5.2 (cis-trans-isomerases)

• Category:EC 5.2
• FKBP: FKBP1A
• FKBP1B
• FKBP2
• FKBP3
• FKBP5
• FKBP6
• FKBP8
• FKBP9
• FKBP10
• FKBP52
• FKBPL
• Cyclophilin
• Parvulin
• Prolyl isomerase
• 2-chloro-4-carboxymethylenebut-2-en-1,4-olide isomerase
• Beta-carotene isomerase
• Farnesol 2-isomerase
• Furylfuramide isomerase
• Linoleate isomerase
• Maleate isomerase
• Maleylacetoacetate isomerase
• Maleylpyruvate isomerase
• Parvulin
• Photoisomerase
• Prolycopene isomerase
• Prolyl isomerase
• Retinal isomerase
• Retinol isomerase
• Zeta-carotene isomerase

Category:EC 5.3 (intramolecular oxidoreductases)

• Category:EC 5.3.3
  • Enoyl CoA isomerase (EC 5.3.3.8)
• Category:EC 5.3.4
  • Protein disulfide isomerase (EC 5.3.4.1)

Category:EC 5.4 (intramolecular transferases -- mutases)

• Category:EC 5.4.2
  • Phosphoglucomutase (EC 5.4.2.2)

Category:EC 5.5 (intramolecular lyases)

Intramolecular lyases:

EC number	Examples
EC 5.5.1.1	Muconate cycloisomerase
EC 5.5.1.2	3-carboxy-cis,cis-muconate cycloisomerase
EC 5.5.1.3	Tetrahydroxypteridine cycloisomerase
EC 5.5.1.4	Inositol-3-phosphate synthase
EC 5.5.1.5	Carboxy-cis,cis-muconate cyclase
EC 5.5.1.6	Chalcone isomerase
EC 5.5.1.7	Chloromuconate cycloisomerase
EC 5.5.1.8	(+)-bornyl diphosphate synthase
EC 5.5.1.9	Cycloeucalenol cycloisomerase
EC 5.5.1.10	Alpha-pinene-oxide decyclase
EC 5.5.1.11	Dichloromuconate cycloisomerase
EC 5.5.1.12	Copalyl diphosphate synthase
EC 5.5.1.13	Ent-copalyl diphosphate synthase
EC 5.5.1.14	Syn-copalyl-diphosphate synthase
EC 5.5.1.15	Terpentedienyl-diphosphate synthase
EC 5.5.1.16	Halimadienyl-diphosphate synthase
EC 5.5.1.17	(S)-beta-macrocarpene synthase
EC 5.5.1.18	Lycopene epsilon-cyclase
EC 5.5.1.19	Lycopene beta-cyclase
EC 5.5.1.20	Prosolanapyrone-III cycloisomerase
EC 5.5.1.n1	D-ribose pyranase
EC 5.5.1.22	Steroid Delta Isomerase

Category:EC 5.99 (other isomerases)

• Category:EC 5.99.1
  • Topoisomerase (type I: EC 5.99.1.2, type II: EC 5.99.1.3)

Category:Ligases (EC 6) (Ligase)

Category:EC 6.1 (form carbon-oxygen bonds)

6-carboxytetrahydropterin synthase

• Category:EC 6.1.1
  • FARSB (EC 6.1.1.20)

Category:EC 6.2 (form carbon-sulfur bonds)

• EC 6.2.1.1: Acetate--CoA ligase
• EC 6.2.1.2: Medium-chain acyl-CoA ligase
• EC 6.2.1.3: Long-chain-fatty-acid-CoA ligase
• EC 6.2.1.4: Succinate-CoA ligase (GDP-forming)
• EC 6.2.1.5: Succinate-CoA ligase (ADP-forming)
• EC 6.2.1.6: Glutarate-CoA ligase
• EC 6.2.1.7: Cholate-CoA ligase
• EC 6.2.1.8: Oxalate-CoA ligase
• EC 6.2.1.9: Malate-CoA ligase
• EC 6.2.1.10: Acid-CoA ligase (GDP-forming)
• EC 6.2.1.11: Biotin-CoA ligase
• EC 6.2.1.12: 4-coumarate-CoA ligase
• EC 6.2.1.13: Acetate-CoA ligase (ADP-forming)
• EC 6.2.1.14: 6-carboxyhexanoate-CoA ligase
• EC 6.2.1.15: Arachidonate-CoA ligase
• EC 6.2.1.16: Acetoacetate-CoA ligase
• EC 6.2.1.17: Propionate-CoA ligase
• EC 6.2.1.18: Citrate-CoA ligase
• EC 6.2.1.19: Long-chain-fatty-acid-luciferin-component ligase
• EC 6.2.1.20: Long-chain-fatty-acid-(acyl-carrier-protein) ligase
• EC 6.2.1.21: Transferred entry: 6.2.1.30
• EC 6.2.1.22: (citrate (pro-3S)-lyase) ligase
• EC 6.2.1.23: Dicarboxylate-CoA ligase
• EC 6.2.1.24: Phytanate-CoA ligase
• EC 6.2.1.25: Benzoate-CoA ligase
• EC 6.2.1.26: o-succinylbenzoate-CoA ligase
• EC 6.2.1.27: 4-hydroxybenzoate-CoA ligase
• EC 6.2.1.28: 3a,7a-dihydroxy-5b-cholestanate-CoA ligase
• EC 6.2.1.29: Transferred entry: 6.2.1.7
• EC 6.2.1.30: Phenylacetate-CoA ligase
• EC 6.2.1.31: 2-furoate-CoA ligase
• EC 6.2.1.32: Anthranilate-CoA ligase
• EC 6.2.1.33: 4-chlorobenzoate-CoA ligase
• EC 6.2.1.34: Trans-feruloyl-CoA synthase
• EC 6.2.1.35: ACP-SH:acetate ligase
• EC 6.2.1.36: 3-hydroxypropionyl-CoA synthase
• EC 6.2.1.37: 3-hydroxybenzoate—CoA ligase
• EC 6.2.1.38: (2,2,3-trimethyl-5-oxocyclopent-3-enyl)acetyl-CoA synthase
• EC 6.2.1.39: (butirosin acyl-carrier protein)—L-glutamate ligase
• EC 6.2.1.40: 4-hydroxybutyrate-CoA ligase
• EC 6.2.1.41: 3-((3aS,4S,7aS)-7a-methyl-1,5-dioxo-octahydro-1H-inden-4-yl)propanoate-CoA ligase
• EC 6.2.1.42: 3-oxocholest-4-en-26-oate-CoA ligase
• EC 6.2.1.43: 2-hydroxy-7-methoxy-5-methyl-1-naphthoate-CoA ligase
• EC 6.2.1.44: 3-(methylthio)propionyl-CoA ligase
• EC 6.2.1.45: E1 ubiquitin-activating enzyme
• EC 6.2.1.46: L-allo-isoleucine--holo-CmaA peptidyl-carrier protein ligase
• EC 6.2.1.47: Medium-chain-fatty-acid-(acyl-carrier-protein) ligase
• EC 6.2.1.48: Carnitine-CoA ligase
• EC 6.2.1.49: Long-chain fatty acid adenylyltransferase FadD28
• EC 6.2.1.50: 4-hydroxybenzoate adenylyltransferase FadD22
• EC 6.2.1.51: 4-hydroxyphenylalkanoate adenylyltransferase FadD29
• EC 6.2.1.52: L-firefly luciferin-CoA ligase
• EC 6.2.1.53: L-proline-L-prolyl-carrier protein ligase
• EC 6.2.1.54: D-alanine-D-alanyl-carrier protein ligase
• EC 6.2.1.55: E1 SAMP-activating enzyme

Category:EC 6.3 (form carbon-nitrogen bonds)

• Glutamine synthetase (EC 6.3.1.2)
• Argininosuccinate synthetase (EC 6.3.4.5)
• CTP synthase (EC 6.3.4.2)

Category:EC 6.4 (form carbon-carbon bonds)

• Pyruvate carboxylase (EC 6.4.1.1)
• Acetyl-CoA carboxylase (EC 6.4.1.2)

Category:EC 6.5 (form phosphoric ester bonds)

DNA ligase (EC 6.5.1.1)

Category:EC 6.6 (form nitrogen-metal bonds)