List of enzymes - AbsoluteAstronomy.com

This article is a list of enzyme

Enzyme

Enzymes are proteins that catalyze chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical reactions in a biological cell need enzymes in order to occur at rates...

s, sorted by their respective sub-categories and EC number

EC number

The Enzyme Commission number is a numerical classification scheme for enzymes, based on the chemical reactions they catalyze....

.

See also:

:Category:Oxidoreductases (EC 1) (Oxidoreductase
Oxidoreductase
In biochemistry, an oxidoreductase is an enzyme that catalyzes the transfer of electrons from one molecule to another...

)

Dehydrogenase
Dehydrogenase
A dehydrogenase is an enzyme that oxidises a substrate by a reduction reaction that transfers one or more hydrides to an electron acceptor, usually NAD+/NADP+ or a flavin coenzyme such as FAD or FMN.-Examples:...
Luciferase
Luciferase
Luciferase is a generic term for the class of oxidative enzymes used in bioluminescence and is distinct from a photoprotein. One famous example is the firefly luciferase from the firefly Photinus pyralis. "Firefly luciferase" as a laboratory reagent usually refers to P...
DMSO reductase
DMSO reductase
DMSO reductase is a molybdenum-containing enzyme capable of reducing dimethyl sulfoxide to dimethyl sulfide . This enzyme serves as the terminal reductase under anaerobic conditions in some bacteria, with DMSO being the terminal electron acceptor...

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

:Category:EC 1.1.1 (with NAD⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

or NADP⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

as acceptor)
- Alcohol dehydrogenase (NAD)
  Alcohol dehydrogenase
  Alcohol dehydrogenases are a group of dehydrogenase enzymes that occur in many organisms and facilitate the interconversion between alcohols and aldehydes or ketones with the reduction of nicotinamide adenine dinucleotide...
- Alcohol dehydrogenase (NADP)
  Alcohol dehydrogenase
  Alcohol dehydrogenases are a group of dehydrogenase enzymes that occur in many organisms and facilitate the interconversion between alcohols and aldehydes or ketones with the reduction of nicotinamide adenine dinucleotide...
- Homoserine dehydrogenase
  Homoserine dehydrogenase
  In enzymology, a homoserine dehydrogenase is an enzyme that catalyzes the chemical reactionThe 3 substrates of this enzyme are L-homoserine, NAD+, and NADP+, whereas its 4 products are L-aspartate 4-semialdehyde, NADH, NADPH, and H+....
- Aminopropanol oxidoreductase
- Diacetyl reductase
- Glycerol dehydrogenase
  Glycerol dehydrogenase
  In enzymology, a glycerol dehydrogenase is an enzyme that catalyzes the chemical reaction:Thus, the two substrates of this enzyme are glycerol and NAD+, whereas its three products are glycerone, NADH, and H+....
- Propanediol-phosphate dehydrogenase
  Propanediol-phosphate dehydrogenase
  In enzymology, a propanediol-phosphate dehydrogenase is an enzyme that catalyzes the chemical reactionThus, the two substrates of this enzyme are propane-1,2-diol 1-phosphate and NAD+, whereas its 3 products are hydroxyacetone phosphate, NADH, and H+....
- glycerol-3-phosphate dehydrogenase (NAD+)
  Glycerol-3-phosphate dehydrogenase (NAD+)
  In enzymology, a glycerol-3-phosphate dehydrogenase is an enzyme that catalyzes the chemical reactionThus, the two substrates of this enzyme are sn-glycerol 3-phosphate and NAD+, whereas its 3 products are glycerone phosphate, NADH, and H+....
- D-xylulose reductase
  D-xylulose reductase
  In enzymology, a D-xylulose reductase is an enzyme that catalyzes the chemical reactionThus, the two substrates of this enzyme are xylitol and NAD+, whereas its 3 products are D-xylulose, NADH, and H+....
- L-xylulose reductase
  L-xylulose reductase
  L-xylulose reductase is an enzyme responsible for the metabolism of xylulose, converting it into xylitol....
- Lactate dehydrogenase
  Lactate dehydrogenase
  Lactate dehydrogenase is an enzyme present in a wide variety of organisms, including plants and animals.Lactate dehydrogenases exist in four distinct enzyme classes. Two of them are cytochrome c-dependent enzymes, each acting on either D-lactate or L-lactate...
- Malate dehydrogenase
  Malate dehydrogenase
  Malate dehydrogenase is an enzyme in the citric acid cycle that catalyzes the conversion of malate into oxaloacetate and vice versa...
- Isocitrate dehydrogenase
  Isocitrate dehydrogenase
  Isocitrate dehydrogenase and , also known as IDH, is an enzyme that participates in the citric acid cycle. It catalyzes the third step of the cycle: the oxidative decarboxylation of isocitrate, producing alpha-ketoglutarate and CO2 while converting NAD+ to NADH...
- HMG-CoA reductase
  HMG-CoA reductase
  HMG-CoA reductase is the rate-controlling enzyme of the mevalonate pathway, the metabolic pathway that produces cholesterol and other isoprenoids...
:Category:EC 1.1.2 (with a cytochrome
Cytochrome
Cytochromes are, in general, membrane-bound hemoproteins that contain heme groups and carry out electron transport.They are found either as monomeric proteins or as subunits of bigger enzymatic complexes that catalyze redox reactions....

as acceptor)
:Category:EC 1.1.3 (with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...

as acceptor)
- Glucose oxidase
  Glucose oxidase
  The glucose oxidase enzyme is an oxido-reductase that catalyses the oxidation of glucose to hydrogen peroxide and D-glucono-δ-lactone. In cells, it aids in breaking the sugar down into its metabolites....
- L-gulonolactone oxidase
  L-gulonolactone oxidase
  L-gulonolactone oxidase is an enzyme that catalyzes the reaction of D-glucuronolactone with oxygen to L-xylo-hex-3-gulonolactone and hydrogen peroxide. It uses FAD as a cofactor...
- Thiamine oxidase
  Thiamine oxidase
  In enzymology, a thiamine oxidase is an enzyme that catalyzes the chemical reactionThe 3 substrates of this enzyme are thiamine, O2, and H2O, whereas its two products are thiamine acetic acid and H2O2....
- Xanthine oxidase
  Xanthine oxidase
  Xanthine oxidase Xanthine oxidase Xanthine oxidase (XO (sometimes 'XAO'), a form of xanthine oxidoreductase that generates reactive oxygen species. Is an enzyme that catalyzes the oxidation of hypoxanthine to xanthine and can further catalyze the oxidation of xanthine to uric acid...
:Category:EC 1.1.4 (with a disulfide
Disulfide
In chemistry, a disulfide usually refers to the structural unit composed of a linked pair of sulfur atoms. Disulfide usually refer to a chemical compound that contains a disulfide bond, such as diphenyl disulfide, C6H5S-SC6H5....

as acceptor)
:Category:EC 1.1.5 (with a quinone
Quinone
A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure."...

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
- Acetaldehyde dehydrogenase
  Acetaldehyde dehydrogenase
  Acetaldehyde dehydrogenases are dehydrogenase enzymes which catalyze the conversion of acetaldehyde into acetic acid. The oxidation of acetaldehyde to acetate can be summarized as follows:...
- Glyceraldehyde 3-phosphate dehydrogenase
  Glyceraldehyde 3-phosphate dehydrogenase
  Glyceraldehyde 3-phosphate dehydrogenase is an enzyme of ~37kDa that catalyzes the sixth step of glycolysis and thus serves to break down glucose for energy and carbon molecules...
- Pyruvate dehydrogenase
  Pyruvate dehydrogenase
  Pyruvate dehydrogenase complex is a complex of three enzymes that transform pyruvate into acetyl-CoA by a process called pyruvate decarboxylation. Acetyl-CoA may then be used in the citric acid cycle to carry out cellular respiration, and this complex links the glycolysis metabolic pathway to the...
:Category:EC 1.2.4
- Oxoglutarate dehydrogenase
  Oxoglutarate dehydrogenase
  The oxoglutarate dehydrogenase complex or α-ketoglutarate dehydrogenase complex is an enzyme complex, most commonly known for its role in the citric acid cycle.-Units:...

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

:Category:EC 1.3.1 (with NAD⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

or NADP⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

as acceptor)
- Biliverdin reductase
  Biliverdin reductase
  Biliverdin reductase is an enzyme found in the liver that facilitates the conversion of biliverdin to bilirubin. It accomplishes this through the reduction of a double-bond between the second and third pyrrole ring into a single-bond....
:Category:EC 1.3.2 (with a cytochrome
Cytochrome
Cytochromes are, in general, membrane-bound hemoproteins that contain heme groups and carry out electron transport.They are found either as monomeric proteins or as subunits of bigger enzymatic complexes that catalyze redox reactions....

as acceptor)
:Category:EC 1.3.3 (with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...

as acceptor)
- Protoporphyrinogen oxidase
  Protoporphyrinogen oxidase
  Protoporphyrinogen oxidase is an enzyme that is responsible for the seventh step in heme production....
:Category:EC 1.3.5 (with a quinone
Quinone
A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure."...

or similar compound as acceptor)
:Category:EC 1.3.7 (with an iron-sulfur protein
Iron-sulfur protein
Iron-sulfur proteins are proteins characterized by the presence of iron-sulfur clusters containing sulfide-linked di-, tri-, and tetrairon centers in variable oxidation states...

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
  Monoamine oxidase
  L-Monoamine oxidases are a family of enzymes that catalyze the oxidation of monoamines. They are found bound to the outer membrane of mitochondria in most cell types in the body. The enzyme was originally discovered by Mary Bernheim in the liver and was named tyramine oxidase...

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

:Category:EC 1.5.1 (with NAD⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

or NADP⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

as acceptor)
- Dihydrofolate reductase
  Dihydrofolate reductase
  - Function :Dihydrofolate reductase converts dihydrofolate into tetrahydrofolate, a methyl group shuttle required for the de novo synthesis of purines, thymidylic acid, and certain amino acids...
- Methylenetetrahydrofolate reductase
  Methylenetetrahydrofolate reductase
  Methylenetetrahydrofolate reductase is an enzyme that in humans is encoded by the MTHFR gene. Methylenetetrahydrofolate reductase catalyzes the conversion of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, a cosubstrate for homocysteine remethylation to methionine...
:Category:EC 1.5.3 (with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...

as acceptor)
- Sarcosine oxidase
  Sarcosine oxidase
  Sarcosine oxidase is an enzyme that catalyzes the oxidative demethylation of sarcosine to yield glycine, H2O2, 5,10-CH2-tetrahydrofolate in a reaction requiring H4-tetrahydrofolate and oxygen....
- Dihydrobenzophenanthridine oxidase
  Dihydrobenzophenanthridine oxidase
  Dihydrobenzophenanthridine oxidase is an enzyme. In the IUBMB Enzyme Nomenclature, Dihydrobenzophenanthridine oxidase is .Dihydrobenzophenanthridine oxidase/EC 1.5.3.12 produces oxidized forms of benzophenanthridine alkaloids:...
:Category:EC 1.5.4 (with a disulfide
Disulfide
In chemistry, a disulfide usually refers to the structural unit composed of a linked pair of sulfur atoms. Disulfide usually refer to a chemical compound that contains a disulfide bond, such as diphenyl disulfide, C6H5S-SC6H5....

as acceptor)
:Category:EC 1.5.5 (with a quinone
Quinone
A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure."...

or similar compound as acceptor)
:Category:EC 1.5.7 (with an iron-sulfur protein
Iron-sulfur protein
Iron-sulfur proteins are proteins characterized by the presence of iron-sulfur clusters containing sulfide-linked di-, tri-, and tetrairon centers in variable oxidation states...

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⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

or NADP⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

as acceptor)
:Category:EC 1.6.2 (with a cytochrome
Cytochrome
Cytochromes are, in general, membrane-bound hemoproteins that contain heme groups and carry out electron transport.They are found either as monomeric proteins or as subunits of bigger enzymatic complexes that catalyze redox reactions....

as acceptor)
:Category:EC 1.6.3 (with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...

as acceptor)
:Category:EC 1.6.4 (with a disulfide
Disulfide
In chemistry, a disulfide usually refers to the structural unit composed of a linked pair of sulfur atoms. Disulfide usually refer to a chemical compound that contains a disulfide bond, such as diphenyl disulfide, C6H5S-SC6H5....

as acceptor)
:Category:EC 1.6.5 (with a quinone
Quinone
A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure."...

or similar compound as acceptor)
- NADH dehydrogenase
  NADH dehydrogenase
  NADH dehydrogenase is an enzyme located in the inner mitochondrial membrane that catalyzes the transfer of electrons from NADH to coenzyme Q...
:Category:EC 1.6.6 (with a nitrogen
Nitrogen
Nitrogen is a chemical element that has the symbol N, atomic number of 7 and atomic mass 14.00674 u. Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.08% by volume of Earth's atmosphere...

ous group as acceptor)
:Category:EC 1.6.7 (with an iron-sulfur protein
Iron-sulfur protein
Iron-sulfur proteins are proteins characterized by the presence of iron-sulfur clusters containing sulfide-linked di-, tri-, and tetrairon centers in variable oxidation states...

as acceptor)
:Category:EC 1.6.8 (with a flavin as acceptor)
: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⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

or NADP⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

as acceptor)
:Category:EC 1.7.2 (with a cytochrome
Cytochrome
Cytochromes are, in general, membrane-bound hemoproteins that contain heme groups and carry out electron transport.They are found either as monomeric proteins or as subunits of bigger enzymatic complexes that catalyze redox reactions....

as acceptor)
:Category:EC 1.7.3 (with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...

as acceptor)
- Urate oxidase
  Urate oxidase
  The enzyme urate oxidase , or uricase or factor-independent urate hydroxylase, catalyzes the oxidation of uric acid to 5-hydroxyisourate:-Structure:...
:Category:EC 1.7.7 (with an iron-sulfur protein
Iron-sulfur protein
Iron-sulfur proteins are proteins characterized by the presence of iron-sulfur clusters containing sulfide-linked di-, tri-, and tetrairon centers in variable oxidation states...

as acceptor)
:Category:EC 1.7.99 (with other acceptors)
- Nitrite reductase
  Nitrite reductase
  Nitrite reductase refers to any of several classes of enzymes that catalyze the reduction of nitrite. There are two classes of NIR's. A multi haem enzyme reduces NO2 to a variety of products. Copper containing enzymes carry out a single electron transfer to produce nitric oxide.- Iron based...
- Nitrate reductase
  Nitrate reductase
  Nitrate reductases are molybdoenzymes that reduce nitrate to nitrite .* Eukaryotic nitrate reductases are part of the sulfite oxidase family of molybdoenzymes....

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

:Category:EC 1.8.1 (with NAD⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

or NADP⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

as acceptor)
- Glutathione reductase
  Glutathione reductase
  Glutathione reductase, also known as GSR or GR, is an enzyme that reduces glutathione disulfide to the sulfhydryl form GSH, which is an important cellular antioxidant....
- Thioredoxin reductase
  Thioredoxin reductase
  Thioredoxin Reductases are the only known enzymes to reduce thioredoxin . Two classes of thioredoxin reductase have been identified: one class in bacteria and some eukaryotes and one in animals. Both classes are flavoproteins which function as homodimers...
:Category:EC 1.8.2 (with a cytochrome
Cytochrome
Cytochromes are, in general, membrane-bound hemoproteins that contain heme groups and carry out electron transport.They are found either as monomeric proteins or as subunits of bigger enzymatic complexes that catalyze redox reactions....

as acceptor)
:Category:EC 1.8.3 (with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...

as acceptor)
- Sulfite oxidase
  Sulfite oxidase
  Sulfite oxidase is an enzyme in the mitochondria of all eukaryotes. It oxidizes sulfite to sulfate and, via cytochrome c, transfers the electrons produced to the electron transport chain, allowing generation of ATP in oxidative phosphorylation...
:Category:EC 1.8.4 (with a disulfide
Disulfide
In chemistry, a disulfide usually refers to the structural unit composed of a linked pair of sulfur atoms. Disulfide usually refer to a chemical compound that contains a disulfide bond, such as diphenyl disulfide, C6H5S-SC6H5....

as acceptor)
:Category:EC 1.8.5 (with a quinone
Quinone
A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure."...

or similar compound as acceptor)
:Category:EC 1.8.6 (with a sulfur
Sulfur
Sulfur or sulphur is the chemical element with atomic number 16. In the periodic table it is represented by the symbol S. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow...

group as acceptor)
:Category:EC 1.8.7 (with an iron-sulfur protein
Iron-sulfur protein
Iron-sulfur proteins are proteins characterized by the presence of iron-sulfur clusters containing sulfide-linked di-, tri-, and tetrairon centers in variable oxidation states...

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
Heme
A heme or haem is a prosthetic group that consists of an iron atom contained in the center of a large heterocyclic organic ring called a porphyrin. Not all porphyrins contain iron, but a substantial fraction of porphyrin-containing metalloproteins have heme as their prosthetic group; these are...

group of donors)

:Category:EC 1.9.3 (with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...

as acceptor)
- Cytochrome c oxidase
  Cytochrome c oxidase
  The enzyme cytochrome c oxidase or Complex IV is a large transmembrane protein complex found in bacteria and the mitochondrion.It is the last enzyme in the respiratory electron transport chain of mitochondria located in the mitochondrial membrane...
:Category:EC 1.9.6 (with a nitrogen
Nitrogen
Nitrogen is a chemical element that has the symbol N, atomic number of 7 and atomic mass 14.00674 u. Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.08% by volume of Earth's atmosphere...

ous as acceptor)

:Category:EC 1.97

:Category:EC 1.97.1
- Deiodinase
  Deiodinase
  Iodothyronine deiodinases are a subfamily of deiodinase enzymes important in the activation and deactivation of thyroid hormones. Thyroxine , the precursor of 3,5,3’-triiodothyronine is transformed into T3 by deiodinase activity. T3, through binding a nuclear thyroid hormone receptor,...
:Category:EC 1.9.99 (with other acceptors)

:Category:EC 1.10 (act on diphenol
Benzenediol
Benzenediols or dihydroxybenzenes are organic chemical compounds in which two hydroxyl groups are substituted onto a benzene ring. These aromatic compounds are classed as phenols, and more specifically as polyphenols...

s and related substances as donors)

:Category:EC 1.10.1(with NAD⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

or NADP⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

as acceptor)
:Category:EC 1.10.2 (with a cytochrome
Cytochrome
Cytochromes are, in general, membrane-bound hemoproteins that contain heme groups and carry out electron transport.They are found either as monomeric proteins or as subunits of bigger enzymatic complexes that catalyze redox reactions....

as acceptor)
- Coenzyme Q - cytochrome c reductase
  Coenzyme Q - cytochrome c reductase
  In enzymology, a ubiquinol—cytochrome-c reductase is an enzyme that catalyzes the chemical reactionThus, the two substrates of this enzyme are dihydroquinone and ferri- cytochrome c, whereas its 3 products are quinone , ferro- cytochrome c, and H+.This enzyme belongs to the family of...
:Category:EC 1.10.3 (with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...

as acceptor)
- Catechol oxidase
  Catechol oxidase
  Catechol oxidase is an enzyme that catalyses the oxidation of phenols such as catechol. Catechol oxidase is a copper-containing enzyme whose activity is similar to that of tyrosinase, a related class of copper oxidases....
- Laccase
  Laccase
  Laccases are copper-containing oxidase enzymes that are found in many plants, fungi, and microorganisms. The copper is bound in several sites; Type 1, Type 2, and/or Type 3. The ensemble of types 2 and 3 copper is called a trinuclear cluster . Type 1 copper is available to action of solvents,...
:Category:EC 1.10.99 (with other acceptors)

:Category:EC 1.11 (act on peroxide
Peroxide
A peroxide is a compound containing an oxygen–oxygen single bond or the peroxide anion .The O−O group is called the peroxide group or peroxo group. In contrast to oxide ions, the oxygen atoms in the peroxide ion have an oxidation state of −1.The simplest stable peroxide is hydrogen peroxide...

as an acceptor -- peroxidase
Peroxidase
Peroxidases are a large family of enzymes that typically catalyze a reaction of the form:For many of these enzymes the optimal substrate is hydrogen peroxide, but others are more active with organic hydroperoxides such as lipid peroxides...

s)

:Category:EC 1.11.1 (peroxidase
Peroxidase
Peroxidases are a large family of enzymes that typically catalyze a reaction of the form:For many of these enzymes the optimal substrate is hydrogen peroxide, but others are more active with organic hydroperoxides such as lipid peroxides...

s)
- Cytochrome c peroxidase
  Cytochrome c peroxidase
  Cytochrome c peroxidase, or CCP is a water-soluble heme-containing enzyme of the peroxidase family that takes reducing equivalents from cytochrome c and reduces hydrogen peroxide to water:...
- Catalase
  Catalase
  Catalase is a common enzyme found in nearly all living organisms that are exposed to oxygen, where it catalyzes the decomposition of hydrogen peroxide to water and oxygen...
- Myeloperoxidase
  Myeloperoxidase
  Myeloperoxidase is a peroxidase enzyme that in humans is encoded by the MPO gene. Myeloperoxidase is most abundantly expressed in neutrophil granulocytes . It is a lysosomal protein stored in azurophilic granules of the neutrophil...
- Thyroid peroxidase
  Thyroid peroxidase
  Thyroid peroxidase or thyroperoxidase is an enzyme expressed mainly in the thyroid that liberates iodine for addition onto tyrosine residues on thyroglobulin for the production of thyroxine or triiodothyronine , thyroid hormones. In humans, thyroperoxidase is encoded by the TPO...
- Glutathione peroxidase
  Glutathione peroxidase
  Glutathione peroxidase is the general name of an enzyme family with peroxidase activity whose main biological role is to protect the organism from oxidative damage...

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

:Category:EC 1.12.1 (with NAD⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

or NADP⁺
Nicotinamide adenine dinucleotide
Nicotinamide adenine dinucleotide, abbreviated NAD, is a coenzyme found in all living cells. The compound is a dinucleotide, since it consists of two nucleotides joined through their phosphate groups. One nucleotide contains an adenine base and the other nicotinamide.In metabolism, NAD is involved...

as acceptor)
:Category:EC 1.12.2 (with a cytochrome
Cytochrome
Cytochromes are, in general, membrane-bound hemoproteins that contain heme groups and carry out electron transport.They are found either as monomeric proteins or as subunits of bigger enzymatic complexes that catalyze redox reactions....

as acceptor)
:Category:EC 1.12.5 (with a quinone
Quinone
A quinone is a class of organic compounds that are formally "derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C– groups with any necessary rearrangement of double bonds," resulting in "a fully conjugated cyclic dione structure."...

or similar compound as acceptor)
:Category:EC 1.12.7 (with an iron-sulfur protein
Iron-sulfur protein
Iron-sulfur proteins are proteins characterized by the presence of iron-sulfur clusters containing sulfide-linked di-, tri-, and tetrairon centers in variable oxidation states...

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
  4-Hydroxyphenylpyruvate dioxygenase
  4-Hydroxyphenylpyruvate dioxygenase HPPD is an Fe-containing enzyme, that catalyzes the second reaction in the catabolism of tyrosine - the conversion of 4-hydroxyphenylpyruvate to homogentisate.-Function:...
:Category:EC 1.13.12 (With incorporation of one atom of oxygen (internal monooxygenases or internal mixed function oxidases))
- Renilla luciferase
- Cypridina luciferase
- Firefly luciferase
- Watasenia luciferase
- Oplophorus luciferase

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

Cytochrome P450 oxidase
Cytochrome P450 oxidase
The cytochrome P450 superfamily is a large and diverse group of enzymes. The function of most CYP enzymes is to catalyze the oxidation of organic substances. The substrates of CYP enzymes include metabolic intermediates such as lipids and steroidal hormones, as well as xenobiotic substances...
:Category:Cytochrome P450
- Aromatase
  Aromatase
  Aromatase is an enzyme responsible for a key step in the biosynthesis of estrogens. It is a member of the cytochrome P450 superfamily , which are monooxygenases that catalyze many reactions involved in steroidogenesis. In particular, aromatase is responsible for the aromatization of androgens into...
- CYP2D6
  CYP2D6
  Cytochrome P450 2D6 , a member of the cytochrome P450 mixed-function oxidase system, is one of the most important enzymes involved in the metabolism of xenobiotics in the body. Also, many substances are bioactivated by CYP2D6 to form their active compounds...
  
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- CYP2E1
  CYP2E1
  Cytochrome P450 2E1 , a member of the cytochrome P450 mixed-function oxidase system, is involved in the metabolism of xenobiotics in the body. In humans, the CYP2E1 enzyme is encoded by the CYP2E1 gene...
- CYP3A4
  CYP3A4
  Cytochrome P450 3A4 , a member of the cytochrome P450 mixed-function oxidase system, is one of the most important enzymes involved in the metabolism of xenobiotics in the body. CYP3A4 is involved in the oxidation of the largest range of substrates of all the CYPs. As a result, CYP3A4 is present in...
- Cytochrome P450 oxidase
  Cytochrome P450 oxidase
  The cytochrome P450 superfamily is a large and diverse group of enzymes. The function of most CYP enzymes is to catalyze the oxidation of organic substances. The substrates of CYP enzymes include metabolic intermediates such as lipids and steroidal hormones, as well as xenobiotic substances...
:Category:EC 1.14.12
- Nitric oxide dioxygenase
  Nitric oxide dioxygenase
  Nitric oxide dioxygenase is an enzyme that catalyzes the conversion of toxic nitric oxide to nitrate . The net reaction for the reaction catalyzed by nitric oxide dioxygenase is shown below:* 2NO + 2O2 + NADH → 2NO3- + NAD+ + H+...
:Category:EC 1.14.13
- Nitric oxide synthase
  Nitric oxide synthase
  Nitric oxide synthases are a family of enzymes that catalyze the production of nitric oxide from L-arginine. NO is an important cellular signaling molecule, having a vital role in many biological processes...
:Category:EC 1.14.14
- Aromatase
  Aromatase
  Aromatase is an enzyme responsible for a key step in the biosynthesis of estrogens. It is a member of the cytochrome P450 superfamily , which are monooxygenases that catalyze many reactions involved in steroidogenesis. In particular, aromatase is responsible for the aromatization of androgens into...
- CYP2D6
  CYP2D6
  Cytochrome P450 2D6 , a member of the cytochrome P450 mixed-function oxidase system, is one of the most important enzymes involved in the metabolism of xenobiotics in the body. Also, many substances are bioactivated by CYP2D6 to form their active compounds...
- CYP2E1
  CYP2E1
  Cytochrome P450 2E1 , a member of the cytochrome P450 mixed-function oxidase system, is involved in the metabolism of xenobiotics in the body. In humans, the CYP2E1 enzyme is encoded by the CYP2E1 gene...
- CYP3A4
  CYP3A4
  Cytochrome P450 3A4 , a member of the cytochrome P450 mixed-function oxidase system, is one of the most important enzymes involved in the metabolism of xenobiotics in the body. CYP3A4 is involved in the oxidation of the largest range of substrates of all the CYPs. As a result, CYP3A4 is present in...
:Category:EC 1.14.16
- Phenylalanine hydroxylase
  Phenylalanine hydroxylase
  Phenylalanine hydroxylase is an enzyme that catalyzes the hydroxylation of the aromatic side-chain of phenylalanine to generate tyrosine. PheOH is one of three members of the pterin-dependent amino acid hydroxylases, a class of monooxygenase that uses tetrahydrobiopterin and a non-heme iron for...
:Category:EC 1.14.18
- Tyrosinase
  Tyrosinase
  Tyrosinase also known as monophenol monooxygenase is an enzyme that catalyses the oxidation of phenols and is widespread in plants and animals...

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

:Category:EC 1.15.1
- Superoxide dismutase
  Superoxide dismutase
  Superoxide dismutases are a class of enzymes that catalyze the dismutation of superoxide into oxygen and hydrogen peroxide. As such, they are an important antioxidant defense in nearly all cells exposed to oxygen...

:Category:EC 1.16 (oxidize metal ions)

:Category:EC 1.16.3
- Ceruloplasmin
  Ceruloplasmin
  Ceruloplasmin is a ferroxidase enzyme that in humans is encoded by the CP gene.Ceruloplasmin is the major copper-carrying protein in the blood, and in addition plays a role in iron metabolism. It was first described in 1948...

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

:Category:EC 1.18.6
- Nitrogenase
  Nitrogenase
  Nitrogenases are enzymes used by some organisms to fix atmospheric nitrogen gas . It is the only known family of enzymes that accomplish this process. Dinitrogen is quite inert because of the strength of its N-N triple bond...

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

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

:Category:EC 2.1 (transfer one-carbon groups, Methylase
Methylase
A methylase is an enzyme that attaches a methyl group to a molecule.These are found in prokaryotes and eukaryotes. Bacteria use methylase to differentiate between foreign genetic material and their own, thus protecting their DNA from their own immune system...

)

:Category:EC 2.1.1
- Catechol-O-methyl transferase
  Catechol-O-methyl transferase
  Catechol-O-methyltransferase is one of several enzymes that degrade catecholamines such as dopamine, epinephrine, and norepinephrine. In humans, catechol-O-methyltransferase protein is encoded by the COMT gene...
- DNA methyltransferase
  DNA methyltransferase
  In biochemistry, the DNA methyltransferase family of enzymescatalyze the transfer of a methyl group to DNA. DNA methylation serves a wide variety of biological functions...
  
  , ,
- Histone methyltransferase
  Histone methyltransferase
  Histone methyltransferases are enzymes, histone-lysine N-methyltransferase and histone-arginine N-methyltransferase, that catalyze the transfer of one to three methyl groups from the cofactor S-Adenosyl methionine to lysine and arginine residues of histone proteins...
  
  ,
:Category:EC 2.1.3
- ATCase
- Ornithine transcarbamoylase

:Category:EC 2.2 (transfer aldehyde
Aldehyde
An aldehyde is an organic compound containing a formyl group. This functional group, with the structure R-CHO, consists of a carbonyl center bonded to hydrogen and an R group....

or ketone
Ketone
In organic chemistry, a ketone is an organic compound with the structure RCR', where R and R' can be a variety of atoms and groups of atoms. It features a carbonyl group bonded to two other carbon atoms. Many ketones are known and many are of great importance in industry and in biology...

groups)

:Category:EC 2.3 (acyltransferases)

:Category:EC 2.3.1
- Aminolevulinic acid synthase
  Aminolevulinic acid synthase
  ALA synthase catalyzes the synthesis of D-Aminolevulinic acid the first common precursor in the biosynthesis of all tetrapyrroles. The enzyme is expressed in all non-plant eukaryotes and the α-class of proteobacteria. Other organisms produce ALA through a three enzyme pathway known as the Shemin...
- Choline acetyltransferase
  Choline acetyltransferase
  Choline acetyltransferase is an enzyme that is synthesized within the body of a neuron. It is then transferred to the nerve terminal via axoplasmic flow. The role of choline acetyltransferase is to join Acetyl-CoA to choline, resulting in the formation of the neurotransmitter acetylcholine...
:Category:EC 2.3.2
- Factor XIII
  Factor XIII
  Factor XIII or fibrin stabilizing factor is an enzyme of the blood coagulation system that crosslinks fibrin.- Function :Factor XIII is a transglutaminase that circulates in the plasma as a heterotetramer of two catalytic A subunits and two carrier B subunits...
- Gamma glutamyl transpeptidase
  Gamma glutamyl transpeptidase
  Gamma-glutamyltransferase or gamma-glutamyl transpeptidase is an enzyme that transfers gamma-glutamyl functional groups...
- Transglutaminase
  Transglutaminase
  Transglutaminases are a family of enzymes that catalyze the formation of a covalent bond between a free amine group and the gamma-carboxamid group of protein- or peptide-bound glutamine. Bonds formed by transglutaminase exhibit high resistance to proteolytic degradation.Transglutaminases were...

:Category:EC 2.4 (glycosyltransferases)

:Category:EC 2.4.2
- Hypoxanthine-guanine phosphoribosyltransferase
  Hypoxanthine-guanine phosphoribosyltransferase
  Hypoxanthine-guanine phosphoribosyltransferase is an enzyme encoded in humans by the HPRT1 gene.HGPRT is a transferase that catalyzes conversion of hypoxanthine to inosine monophosphate and guanine to guanosine monophosphate. This reaction transfers the 5-phosphoribosyl group from...

:Category:EC 2.5

:Category:EC 2.5.1
- Thiaminase
  Thiaminase
  Thiaminase is an enzyme that metabolizes or breaks down thiamine into two molecular parts.The old name was "Aneurinase".There are two types: -Sources:Source include:* Bracken , Nardoo and other plants.* Some fish including carp and goldfish....

:Category:EC 2.5 (transfer alkyl or aryl
Aryl
In the context of organic molecules, aryl refers to any functional group or substituent derived from an aromatic ring, be it phenyl, naphthyl, thienyl, indolyl, etc....

groups, other than methyl groups)

:Category:EC 2.6 (transfer nitrogenous groups)

:Category:EC 2.6.1
- Alanine transaminase
  Alanine transaminase
  Alanine transaminase or ALT is a transaminase enzyme . It is also called serum glutamic pyruvic transaminase or alanine aminotransferase ....
- Aspartate transaminase
  Aspartate transaminase
  Aspartate transaminase , also called aspartate aminotransferase or serum glutamic oxaloacetic transaminase , is a pyridoxal phosphate -dependent transaminase enzyme . AST catalyzes the reversible transfer of an α-amino group between aspartate and glutamate and, as such, is an important enzyme in...

:Category:EC 2.7 (transfer phosphorus-containing groups)

:Category:EC 2.7.2
- Butyrate kinase
  Butyrate kinase
  In enzymology, a butyrate kinase is an enzyme that catalyzes the chemical reactionThus, the two substrates of this enzyme are ATP and butanoate, whereas its two products are ADP and butanoyl phosphate....

:Category:EC 3.1 (act on ester
Ester
Esters are chemical compounds derived by reacting an oxoacid with a hydroxyl compound such as an alcohol or phenol. Esters are usually derived from an inorganic acid or organic acid in which at least one -OH group is replaced by an -O-alkyl group, and most commonly from carboxylic acids and...

bonds)

Nuclease
Nuclease
A nuclease is an enzyme capable of cleaving the phosphodiester bonds between the nucleotide subunits of nucleic acids. Older publications may use terms such as "polynucleotidase" or "nucleodepolymerase"....
Endonuclease
Endonuclease
Endonucleases are enzymes that cleave the phosphodiester bond within a polynucleotide chain, in contrast to exonucleases, which cleave phosphodiester bonds at the end of a polynucleotide chain. Typically, a restriction site will be a palindromic sequence four to six nucleotides long. Most...
Exonuclease
Exonuclease
Exonucleases are enzymes that work by cleaving nucleotides one at a time from the end of a polynucleotide chain. A hydrolyzing reaction that breaks phosphodiester bonds at either the 3’ or the 5’ end occurs. Its close relative is the endonuclease, which cleaves phosphodiester bonds in the middle ...
:Category:EC 3.1.1
- Acid hydrolase
  Acid hydrolase
  An acid hydrolase is an enzyme that works best at acidic pHs. It is commonly located in lysosomes, which are acidic on the inside. Acid hydrolases may be nucleases, proteases, glycosidases, lipases, phosphatases, sulfatases and phospholipases and make up the approximately 50 degradative enzymes of...
- Phospholipase
  Phospholipase
  A phospholipase is an enzyme that hydrolyzes phospholipids into fatty acids and other lipophilic substances. There are four major classes, termed A, B, C and D, distinguished by the type of reaction which they catalyze:*Phospholipase A...
  
  A
- Acetylcholinesterase
  Acetylcholinesterase
  "Acetylcholinesterase, also known as AChE or acetylcholine acetylhydrolase, is an enzyme that degrades the neurotransmitter acetylcholine, producing choline and an acetate group. It is mainly found at neuromuscular junctions and cholinergic nervous system, where its activity serves to terminate...
- Cholinesterase
  Cholinesterase
  In biochemistry, cholinesterase is a family of enzymes that catalyze the hydrolysis of the neurotransmitter acetylcholine into choline and acetic acid, a reaction necessary to allow a cholinergic neuron to return to its resting state after activation.-Types:...
- Lipoprotein lipase
  Lipoprotein lipase
  Lipoprotein lipase is a member of the lipase gene family, which includes pancreatic lipase, hepatic lipase, and endothelial lipase. It is a water soluble enzyme that hydrolyzes triglycerides in lipoproteins, such as those found in chylomicrons and very low-density lipoproteins , into two free...
:Category:EC 3.1.2
- Ubiquitin carboxy-terminal hydrolase L1
  Ubiquitin carboxy-terminal hydrolase L1
  Ubiquitin carboxy-terminal hydrolase L1 is a deubiqutinating enzyme.-Pathology:A point mutation in the gene encoding this protein is implicated as the cause of Parkinson's disease in one kindred....
:Category:EC 3.1.3
- Phosphatase
  Phosphatase
  A phosphatase is an enzyme that removes a phosphate group from its substrate by hydrolysing phosphoric acid monoesters into a phosphate ion and a molecule with a free hydroxyl group . This action is directly opposite to that of phosphorylases and kinases, which attach phosphate groups to their...
- Alkaline phosphatase
  Alkaline phosphatase
  Alkaline phosphatase is a hydrolase enzyme responsible for removing phosphate groups from many types of molecules, including nucleotides, proteins, and alkaloids. The process of removing the phosphate group is called dephosphorylation...
- Fructose bisphosphatase
  Fructose bisphosphatase
  Fructose bisphosphatase is an enzyme in the liver that converts fructose-1,6-bisphosphate to fructose 6-phosphate in gluconeogenesis . Fructose bisphosphatase catalyses the reverse of the reaction which is catalysed by phosphofructokinase, which is involved in the process of glycolysis...
:Category:EC 3.1.4
- Phospholipase
  Phospholipase
  A phospholipase is an enzyme that hydrolyzes phospholipids into fatty acids and other lipophilic substances. There are four major classes, termed A, B, C and D, distinguished by the type of reaction which they catalyze:*Phospholipase A...
  
  C
- CGMP specific phosphodiesterase type 5
  CGMP specific phosphodiesterase type 5
  cGMP-specific phosphodiesterase type 5 is an enzyme from the phosphodiesterase class. It is found in various tissues, most prominently the corpus cavernosum and the retina....
- Phospholipase
  Phospholipase
  A phospholipase is an enzyme that hydrolyzes phospholipids into fatty acids and other lipophilic substances. There are four major classes, termed A, B, C and D, distinguished by the type of reaction which they catalyze:*Phospholipase A...
  
  D
:Category:EC 3.1.21
- Restriction enzyme
  Restriction enzyme
  A Restriction Enzyme is an enzyme that cuts double-stranded DNA at specific recognition nucleotide sequences known as restriction sites. Such enzymes, found in bacteria and archaea, are thought to have evolved to provide a defense mechanism against invading viruses...
  
  Type 1
- Deoxyribonuclease
  Deoxyribonuclease
  A deoxyribonuclease is any enzyme that catalyzes the hydrolytic cleavage of phosphodiester linkages in the DNA backbone. Thus, deoxyribonucleases are one type of nuclease...
  
  I
:Category:EC 3.1.26
- RNase H
  RNase H
  The enzyme RNase H is a non-specific endonuclease and catalyzes the cleavage of RNA via a hydrolytic mechanism. Members of the RNase H family can be found in nearly all organisms, from archaea to bacteria and eukaryota....
:Category:EC 3.1.27
- Ribonuclease
  Ribonuclease
  Ribonuclease is a type of nuclease that catalyzes the degradation of RNA into smaller components. Ribonucleases can be divided into endoribonucleases and exoribonucleases, and comprise several sub-classes within the EC 2.7 and 3.1 classes of enzymes.-Function:All organisms studied contain...

:Category:EC 3.2 (act on sugars - glycosylases)

:Category:EC 3.2.1
- Amylase
  Amylase
  Amylase is an enzyme that catalyses the breakdown of starch into sugars. Amylase is present in human saliva, where it begins the chemical process of digestion. Food that contains much starch but little sugar, such as rice and potato, taste slightly sweet as they are chewed because amylase turns...
- Sucrase
  Sucrase
  Sucrase is the name given to a number of enzymes that catalyze the hydrolysis of sucrose to fructose and glucose. The enzyme invertase, which occurs more commonly in plants, also hydrolyzes sucrose but by a different mechanism.-Physiology:...
- Chitinase
  Chitinase
  Chitinases are hydrolytic enzymes that break down glycosidic bonds in chitin. As chitin is a component of the cell walls of fungi and exoskeletal elements of some animals , chitinases are generally found in organisms that either need to reshape their own chitin or dissolve and digest the chitin of...
- Lysozyme
  Lysozyme
  Lysozyme, also known as muramidase or N-acetylmuramide glycanhydrolase, are glycoside hydrolases, enzymes that damage bacterial cell walls by catalyzing hydrolysis of 1,4-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in a peptidoglycan and between...
- Maltase
  Maltase
  Maltase is an enzyme that breaks down the disaccharide maltose. Maltase is an enzyme that catalyzes the hydrolysis of the disaccharide maltose to the simple sugar glucose. This enzyme is found in plants, bacteria, and yeast. Then there is what is called Acid maltase deficiency...
- Lactase
  Lactase
  Lactase , a part of the β-galactosidase family of enzymes, is a glycoside hydrolase involved in the hydrolysis of the disaccharide lactose into constituent galactose and glucose monomers...
- Beta-galactosidase
  Beta-galactosidase
  β-galactosidase, also called beta-gal or β-gal, is a hydrolase enzyme that catalyzes the hydrolysis of β-galactosides into monosaccharides. Substrates of different β-galactosidases include ganglioside GM1, lactosylceramides, lactose, and various glycoproteins...
- Hyaluronidase
  Hyaluronidase
  The hyaluronidases are a family of enzymes that degrade hyaluronic acid.In humans, there are six associated genes, including HYAL1, HYAL2, HYAL3, and PH-20/SPAM1.-Use as a drug:...

:Category:EC 3.4 (act on peptide bond
Peptide bond
This article is about the peptide link found within biological molecules, such as proteins. A similar article for synthetic molecules is being created...

s - Peptidase)

:Category:EC 3.4.11
- Alanine aminopeptidase
  Alanine aminopeptidase
  Alanine aminopeptidase is an enzyme that is used as a biomarker to detect damage to the kidneys, and that may be used to help diagnose certain kidney disorders. It is found at high levels in the urine when there are kidney problems.-External links:...
:Category:EC 3.4.15
- Angiotensin converting enzyme
:Category:EC 3.4.21
- Serine protease
  Serine protease
  Serine proteases are enzymes that cleave peptide bonds in proteins, in which serine serves as the nucleophilic amino acid at the active site.They are found ubiquitously in both eukaryotes and prokaryotes...
- Chymotrypsin
  Chymotrypsin
  Chymotrypsin is a digestive enzyme that can perform proteolysis. Chymotrypsin preferentially cleaves peptide amide bonds where the carboxyl side of the amide bond is a tyrosine, tryptophan, or phenylalanine. These amino acids contain an aromatic ring in their sidechain that fits into a...
- Trypsin
  Trypsin
  Trypsin is a serine protease found in the digestive system of many vertebrates, where it hydrolyses proteins. Trypsin is produced in the pancreas as the inactive proenzyme trypsinogen. Trypsin cleaves peptide chains mainly at the carboxyl side of the amino acids lysine or arginine, except when...
- Thrombin
  Thrombin
  Thrombin is a "trypsin-like" serine protease protein that in humans is encoded by the F2 gene. Prothrombin is proteolytically cleaved to form thrombin in the first step of the coagulation cascade, which ultimately results in the stemming of blood loss...
- Factor X
  Factor X
  Factor X, also known by the eponym Stuart-Prower factor or as prothrombinase, is an enzyme of the coagulation cascade. It is a serine endopeptidase .-Physiology:...
- Plasmin
  Plasmin
  Plasmin is an important enzyme present in blood that degrades many blood plasma proteins, most notably, fibrin clots. The degradation of fibrin is termed fibrinolysis. In humans, the plasmin protein is encoded by the PLG gene.- Function :...
- Acrosin
  Acrosin
  Acrosin is a digestive enzyme that acts as a protease. In humans, acrosin is encoded by the ACR gene. Acrosin is released from the acrosome of spermatozoa as a consequence of the acrosome reaction. It aids in the penetration of the Zona Pellucida....
- Factor VII
  Factor VII
  Factor VII is one of the proteins that causes blood to clot in the coagulation cascade. It is an enzyme of the serine protease class. A recombinant form of human factor VIIa has U.S. Food and Drug Administration approval for uncontrolled bleeding in hemophilia patients...
- Factor IX
  Factor IX
  Factor IX is one of the serine proteases of the coagulation system; it belongs to peptidase family S1. Deficiency of this protein causes hemophilia B. It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to...
- Prolyl oligopeptidase
- Factor XI
  Factor XI
  Factor XI or plasma thromboplastin antecedent is the zymogen form of factor XIa, one of the enzymes of the coagulation cascade. Like many other coagulation factors, it is a serine protease. In humans, Factor XI is encoded by the F11 gene....
- Elastase
  Elastase
  In molecular biology, elastase is an enzyme from the class of proteases that break down proteins.- Forms and classification:There exist eight human genes for elastase:Bacterial forms: Organisms such as P...
- Factor XII
  Factor XII
  Coagulation factor XII also known as Hageman factor is a plasma protein. It is the zymogen form of factor XIIa, an enzyme of the serine protease class. In humans, factor XII is encoded by the F12 gene.- Function :...
- Proteinase K
  Proteinase K
  Proteinase K is a broad-spectrum serine protease. The enzyme was discovered in 1974 in extracts of the fungus Engyodontium album . Proteinase K is able to digest native keratin , hence, the name "Proteinase K"...
- Tissue plasminogen activator
  Tissue plasminogen activator
  Tissue plasminogen activator is a protein involved in the breakdown of blood clots. It is a serine protease found on endothelial cells, the cells that line the blood vessels. As an enzyme, it catalyzes the conversion of plasminogen to plasmin, the major enzyme responsible for clot breakdown...
- Protein C
  Protein C
  Protein C, also known as autoprothrombin IIA and blood coagulation factor XIV, is a zymogenic protein, the activated form of which plays an important role in regulating blood clotting, inflammation, cell death and maintaining the permeability of blood vessel walls in humans and other animals...
:Category:EC 3.4.22
- Separase
  Separase
  Separase is a cysteine protease responsible for triggering anaphase by hydrolysing cohesin which is the protein responsible for binding sister chromatids during metaphase. In humans, separase is encoded by the ESPL1 gene.- Discovery :...
:Category:EC 3.4.23
- Pepsin
  Pepsin
  Pepsin is an enzyme whose precursor form is released by the chief cells in the stomach and that degrades food proteins into peptides. It was discovered in 1836 by Theodor Schwann who also coined its name from the Greek word pepsis, meaning digestion...
- Rennet
  Rennet
  Rennet is a complex of enzymes produced in any mammalian stomach to digest the mother's milk, and is often used in the production of cheese. Rennet contains many enzymes, including a proteolytic enzyme that coagulates the milk, causing it to separate into solids and liquid...
- Renin
  Renin
  Renin , also known as an angiotensinogenase, is an enzyme that participates in the body's renin-angiotensin system -- also known as the Renin-Angiotensin-Aldosterone Axis -- that mediates extracellular volume , and arterial vasoconstriction...
- Trypsinogen
  Trypsinogen
  Trypsinogen is the precursor form or zymogen of the pancreatic enzyme trypsin. It is found in pancreatic juice, along with amylase, lipase, and chymotrypsinogen. It is activated by enteropeptidase, which is found in the intestinal mucosa, to form trypsin. Once activated, the trypsin can activate...
  
  and (20/21/23/24/26)
- Plasmepsin
  Plasmepsin
  Plasmepsins are a class of at least 10 enzymes produced by the plasmodium parasite. There are ten different isoforms of these proteins and ten genes coding them respectively in plasmodium falciparum . It has been suggested that the plasmpesin family is smaller in other human plasmodium species...
:Category:EC 3.4.24
- Matrix metalloproteinase
  Matrix metalloproteinase
  Matrix metalloproteinases are zinc-dependent endopeptidases; other family members are adamalysins, serralysins, and astacins. The MMPs belong to a larger family of proteases known as the metzincin superfamily....
:Category:EC 3.4.42
- Metalloendopeptidase
  Metalloendopeptidase
  A metalloendopeptidase is an enzyme that functions as a metalloproteinase endopeptidase....

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

:Category:EC 3.5.1 (In linear amides)
- Urease
  Urease
  Urease is an enzyme that catalyzes the hydrolysis of urea into carbon dioxide and ammonia. The reaction occurs as follows:In 1926, James Sumner showed that urease is a protein. Urease is found in bacteria, yeast, and several higher plants. The structure of urease was first solved by P.A...
:Category:EC 3.5.2 (In cyclic amides)
- Beta-lactamase
  Beta-lactamase
  Beta-lactamases are enzymes produced by some bacteria and are responsible for their resistance to beta-lactam antibiotics like penicillins, cephamycins, and carbapenems . These antibiotics have a common element in their molecular structure: a four-atom ring known as a beta-lactam...
:Category:EC 3.5.3 (In linear amidines)
- Arginase
  Arginase
  Arginase is a manganese-containing enzyme. The reaction catalyzed by this enzyme is: arginine + H2O → ornithine + urea. It is the final enzyme of the urea cycle.- Structure and function :Arginase belong to the ureohydrolase family of enzymes....
:Category:EC 3.5.4 (In cyclic amidines)
- Adenosine deaminase
  Adenosine deaminase
  Adenosine deaminase is an enzyme involved in purine metabolism. It is needed for the breakdown of adenosine from food and for the turnover of nucleic acids in tissues.-Reactions:...
- GTP cyclohydrolase I
  GTP cyclohydrolase I
  GTP cyclohydrolase I is a member of the GTP cyclohydrolase family of enzymes. GTPCH is part of the folate and biopterin biosynthesis pathways. It is responsible for the hydrolysis of guanosine triphosphate to form 7,8-dihydroneopterin 3'-triphosphate .GTPCH is encoded by the gene GCH1...
:Category:EC 3.5.5 (In nitriles)
- Nitrilase
  Nitrilase
  Nitrilase enzymes catalyse the hydrolysis of nitriles to carboxylic acids and ammonia, without the formation of "free" amide intermediates. Nitrilases are involved in natural product biosynthesis and post translational modifications in plants, animals, fungi and certain prokaryotes. Nitrilases can...

:Category:EC 3.6 (act on acid anhydrides)

:Category:EC 3.6.1
- Helicase
  Helicase
  Helicases are a class of enzymes vital to all living organisms. They are motor proteins that move directionally along a nucleic acid phosphodiester backbone, separating two annealed nucleic acid strands using energy derived from ATP hydrolysis.-Function:Many cellular processes Helicases are a...
- DnaB helicase
  DnaB helicase
  dnaB helicase is an enzyme in bacteria which opens the replication fork during DNA replication. Although the mechanism by which DnaB both couples ATP hydrolysis to translocation along DNA and denatures the duplex is unknown, a change in the quaternary structure of the protein involving dimerisation...
- RecQ helicase
  RecQ helicase
  RecQ helicase is a family of helicase enzymes that has been shown to be important in genome maintenance. They function through catalyzing the reaction ATP + H2O → ADP + P and thus driving the unwinding of paired DNA and translocating in the 3' to 5' direction...
:Category:EC 3.6.3
- ATPase
  ATPase
  ATPases are a class of enzymes that catalyze the decomposition of adenosine triphosphate into adenosine diphosphate and a free phosphate ion. This dephosphorylation reaction releases energy, which the enzyme harnesses to drive other chemical reactions that would not otherwise occur...
- NaKATPase
- ATP synthase
  ATP synthase
  right|thumb|300px|Molecular model of ATP synthase by X-ray diffraction methodATP synthase is an important enzyme that provides energy for the cell to use through the synthesis of adenosine triphosphate . ATP is the most commonly used "energy currency" of cells from most organisms...

:Category:EC 4.1 (carbon-carbon lyase
Lyase
In biochemistry, a lyase is an enzyme that catalyzes the breaking of various chemical bonds by means other than hydrolysis and oxidation, often forming a new double bond or a new ring structure...

s)

:Category:EC 4.1.1
- Ornithine decarboxylase
  Ornithine decarboxylase
  The enzyme ornithine decarboxylase catalyzes the decarboxylation of ornithine to form putrescine. This reaction is the committed step in polyamine synthesis. In humans, this protein has 461 amino acids and forms a homodimer....
- Uridine monophosphate synthetase
  Uridine monophosphate synthetase
  Uridine monophosphate synthetase is the enzyme that catalyses the formation of uridine monophosphate , an energy-carrying molecule in many important biosynthetic pathways...
- Aromatic-L-amino-acid decarboxylase
- RubisCO
  RuBisCO
  Ribulose-1,5-bisphosphate carboxylase oxygenase, commonly known by the shorter name RuBisCO, is an enzyme involved in the first major step of carbon fixation, a process by which atmospheric carbon dioxide is converted by plants to energy-rich molecules such as glucose. RuBisCo is an abbreviation...

:Category:EC 4.2 (carbon-oxygen lyase
Lyase
In biochemistry, a lyase is an enzyme that catalyzes the breaking of various chemical bonds by means other than hydrolysis and oxidation, often forming a new double bond or a new ring structure...

s)

:Category:EC 4.2.1
- Carbonic anhydrase
  Carbonic anhydrase
  The carbonic anhydrases form a family of enzymes that catalyze the rapid interconversion of carbon dioxide and water to bicarbonate and protons , a reversible reaction that occurs rather slowly in the absence of a catalyst...
- Tryptophan synthase
  Tryptophan synthase
  Tryptophan synthase or tryptophan synthetase is an enzyme that catalyzes the final two steps in the biosynthesis of tryptophan. It is commonly found in Eubacteria, Archaebacteria, Protista, Fungi, and Plantae. However, it is absent from animalia. It is typically found as an α2β2 tetramer...

:Category:EC 4.6 (phosphorus-oxygen lyase
Lyase
In biochemistry, a lyase is an enzyme that catalyzes the breaking of various chemical bonds by means other than hydrolysis and oxidation, often forming a new double bond or a new ring structure...

s)

:Category:EC 4.6.1
- Adenylate cyclase
  Adenylate cyclase
  Adenylate cyclase is part of the G protein signalling cascade, which transmits chemical signals from outside the cell across the membrane to the inside of the cell ....
- Guanylate cyclase
  Guanylate cyclase
  -Reaction:Guanylate cyclase catalyzes the reaction of guanosine triphosphate to 3',5'-cyclic guanosine monophosphate and pyrophosphate:-Types:...

:Category:EC 5.3 (intramolecular
Intramolecular
Intramolecular in chemistry describes a process or characteristic limited within the structure of a single molecule, a property or phenomenon limited to the extent of a single molecule.- Examples :...

oxidoreductase
Oxidoreductase
In biochemistry, an oxidoreductase is an enzyme that catalyzes the transfer of electrons from one molecule to another...

s)

:Category:EC 5.3.3
- Enoyl CoA isomerase
  Enoyl CoA isomerase
  Enoyl CoA isomerase or dodecenoyl-coenzyme A delta-isomerase is an enzyme that catalyzes conversion of cis-double bonds of fatty acids at position 3 to trans double bonds at position 2. It has a special importance in metabolism of unsaturated fatty acids.-External links:...
:Category:EC 5.3.4
- Protein disulfide isomerase
  Protein disulfide isomerase
  Protein disulfide isomerase or PDI is an enzyme in the endoplasmic reticulum in eukaryotes that catalyzes the formation and breakage of disulfide bonds between cysteine residues within proteins as they fold...

:Category:EC 5.4 (intramolecular transferase
Transferase
In biochemistry, a transferase is an enzyme that catalyzes the transfer of a functional group from one molecule to another . For example, an enzyme that catalyzed this reaction would be a transferase:In this example, A would be the donor, and B would be the acceptor...

s -- mutase
Mutase
A mutase is an enzyme that catalyzes the shifting of a functional group from one position to another within the same molecule. Examples of this are bisphosphoglycerate mutase, which appears in red blood cells and phosphoglycerate mutase, which acts in glycolysis. In glycolysis, it changes...

s)

:Category:EC 5.4.2
- Phosphoglucomutase
  Phosphoglucomutase
  Phosphoglucomutase is an enzyme that transfers a phosphate group on an α-D-glucose monomer from the 1' to the 6' position in the forward direction or the 6' to the 1' position in the reverse direction....

:Category:EC 5.99 (other isomerases)

:Category:EC 5.99.1
- Topoisomerase
  Topoisomerase
  Topoisomerases are enzymes that regulate the overwinding or underwinding of DNA. The winding problem of DNA arises due to the intertwined nature of its double helical structure. For example, during DNA replication, DNA becomes overwound ahead of a replication fork...
  
  (type I: , type II: )

:Category:EC 6.3 (form carbon-nitrogen bonds)

Glutamine synthetase
Glutamine synthetase
Glutamine synthetase is an enzyme that plays an essential role in the metabolism of nitrogen by catalyzing the condensation of glutamate and ammonia to form glutamine:Glutamate + ATP + NH3 → Glutamine + ADP + phosphate...
Argininosuccinate synthetase
Argininosuccinate synthetase
Argininosuccinate synthase is an enzyme that catalyzes the synthesis of argininosuccinate from citrulline and aspartateASS is responsible for the third step of the urea cycle and one of the reactions of the Citrulline-NO cycle.-Gene:...
CTP synthase
CTP synthase
CTP synthase is an enzyme involved in pyrimidine biosynthesis that interconverts UTP and CTP.- Enzyme Structure :...

:Category:EC 6.4 (form carbon-carbon bonds)

Pyruvate carboxylase
Pyruvate carboxylase
Pyruvate carboxylase is an enzyme of the ligase class that catalyzes the irreversible carboxylation of pyruvate to form oxaloacetate .It is an important anaplerotic reaction that creates oxaloacetate from pyruvate...
Acetyl-CoA carboxylase
Acetyl-CoA carboxylase
Acetyl-CoA carboxylase is a biotin-dependent enzyme that catalyzes the irreversible carboxylation of acetyl-CoA to produce malonyl-CoA through its two catalytic activities, biotin carboxylase and carboxyltransferase...

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:Category:Oxidoreductases (EC 1) (OxidoreductaseOxidoreductaseIn biochemistry, an oxidoreductase is an enzyme that catalyzes the transfer of electrons from one molecule to another...)