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For many of these enzymes the optimal substrate is hydrogen peroxide, but others are more active with organic hydroperoxides such as lipid peroxides.Peroxidases can contain a heme cofactor in their active sites, or alternately redox-active cysteine or selenocysteine residues.
Horseradish peroxidase is a 44,173.9-dalton glycoprotein with six lysine residues which can be conjugated to a labeled molecule. It produces a coloured, fluorimetric [6] or luminescent derivative of the labeled molecule when incubated with a proper substrate, allowing it to be detected and quantified.
It is commonly used as a substrate with hydrogen peroxide for a peroxidase enzyme (such as horseradish peroxidase) or alone with blue multicopper oxidase enzymes (such as laccase or bilirubin oxidase). Its use allows the reaction kinetics of peroxidases themselves to be followed.
Compound I then oxidizes an organic substrate to give a substrate radical [2] and Compound II, which can then oxidize a second substrate molecule. Haem peroxidases include two superfamilies: one found in bacteria, fungi, and plants, and the second found in animals. The first one can be viewed as consisting of 3 major classes: [3]
The peroxidase structure favors Mn(III)-chelates over free Mn(III) ions. The Mn(III) chelate interacts with the active site to facilitate product release from the enzyme. [7] The chelator can have an effect on the kinetic rate and even the catalyzed reaction. If the substrate Mn(II) is chelated with lactate, MnP instead catalyzes the evolution ...
Glutathione peroxidase 1 (GPx1) is the most abundant version, found in the cytoplasm of nearly all mammalian tissues, whose preferred substrate is hydrogen peroxide. Glutathione peroxidase 4 (GPx4) has a high preference for lipid hydroperoxides; it is expressed in nearly every mammalian cell, though at much lower levels.
In enzymology, a lignin peroxidase (EC 1.11.1.14) is an enzyme that catalyzes the chemical reaction. ... Thus, the two substrates of this enzyme are 1,2-bis ...
In enzymology, a NADPH peroxidase (EC 1.11.1.2) is an enzyme that catalyzes the chemical reaction. NADPH + H + + H 2 O 2 NADP + + 2 H 2 O. The 3 substrates of this enzyme are NADPH, H +, and H 2 O 2, whereas its two products are NADP + and H 2 O.
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