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Histidinol dehydrogenase

Histidinol dehydrogenase or HIS4 (EC 1.1.1.23) is an enzyme that belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is L-histidinol:NAD+ oxidoreductase. This enzyme participates in histidine metabolism.

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Histone acetyltransferase

Histone acetyltransferases (HAT) are enzymes that acetylate conserved lysine amino acids on histone proteins by transferring an acetyl group from acetyl CoA to form ε-N-acetyl lysine.Histone acetyltransferases (HATs) and histone deacetylases (HDACs) are recruited to their target promoters through a physical interaction with a sequence-specific transcription factor.

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Histone methyltransferase

Histone methyltransferases (HMT) 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.

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Homoisocitrate dehydrogenase

Homoisocitrate dehydrogenase (EC 1.1.1.87) is an enzyme that belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is (1R,2S)-1-hydroxybutane-1,2,4-tricarboxylate:NAD+ oxidoreductase (decarboxylating).This enzyme participates in lysine biosynthesis.

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Homoserine dehydrogenase

Homoserine dehydrogenase (EC 1.1.1.3) is an enzyme that belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is L-homoserine:NAD(P)+ oxidoreductase. Other names in common use include HSDH, and HSD. This enzyme participates in glycine, serine and threonine metabolism and lysine biosynthesis.

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Horseradish peroxidase

Horseradish Peroxidase is found in the roots of horseradish, is used extensively in biochemistry applications primarily for its ability to amplify a weak signal and increase detectability of a target molecule. It is a metalloenzyme with many isoforms, of which the most studied type is C. It is an all alpha-helical protein which binds heme as a redox cofactor. Horseradish peroxidase is a 44,173.9-dalton glycoprotein with 6 lysine residues which can be conjugated to a labeled molecule. It produces a coloured, fluorimetric, or luminescent derivative of the labeled molecule when incubated with a proper substrate, allowing it to be detected and quantified. HRP is often used in conjugates (molecules that have been joined genetically or chemically) to determine the presence of a molecular target. Horseradish peroxidase is ideal in many respects for these applications because it is smaller, more stable, and less expensive than other popular alternatives such as alkaline phosphatase. It also has a high turnover rate that allows generation of strong signals in a relatively short time span. It should be noted that high concentrations of phosphate severely decrease stability of horseradish peroxidase. In addition to biomedical applications, horseradish peroxidase is one of the enzymes with important environmental applications. This enzyme is suitable for the removal of hydroxylated aromatic compounds (HACs) that are considered to be primary pollutants in a wide variety of industrial wastewater. Horseradish Peroxidase catalyses the oxidation of luminol to 3-aminophthalate via several intermediates.

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Hyaluronidase

Hyaluronidases are a family of enzymes that degrade hyaluronic acid.It is used for enhancing absorption and distribution of other injected drugs.It is used in medicine in conjunction with other drugs to speed their dispersion and delivery.

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Hydrogen dehydrogenase

Hydrogen dehydrogenase (EC 1.12.1.2) is an enzyme that belongs to the family of oxidoreductases, specifically those acting on hydrogen as donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is hydrogen:NAD+ oxidoreductase.his enzyme participates in glyoxylate and dicarboxylate metabolism and methane metabolism. It has 6 cofactors: FAD, Iron, FMN, Flavin, Nickel, and Iron-sulfur.

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Hydrolase

Hydrolase is an enzyme that catalyzes the hydrolysis of a chemical bond. Systematic names of hydrolases are formed as "substrate hydrolase." However, common names are typically in the form "substratease."

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Hydroxylamine oxidase

Hydroxylamine oxidase (EC 1.7.3.4) is an enzyme that belongs to the family of oxidoreductases, specifically those acting on other nitrogenous compounds as donors with oxygen as acceptor. The systematic name of this enzyme class is hydroxylamine:oxygen oxidoreductase.This enzyme participates in nitrogen metabolism. It employs one cofactor, heme.

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