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This beetle has two sets of liquids that are stored separately in two paired glands. The larger of the pair, the storage chamber or reservoir, contains hydroquinones and hydrogen peroxide, while the smaller, the reaction chamber, contains catalases and peroxidases. To activate the noxious spray, the beetle mixes the contents of the two ...
Catalase-peroxidase (EC 1.11.1.21, katG (gene)) is an enzyme with systematic name donor:hydrogen-peroxide oxidoreductase.
In enzymology, a manganese peroxidase (EC 1.11.1.13) is an enzyme that catalyzes the chemical reaction 2 Mn(II) + 2 H + + H 2 O 2 ⇌ {\displaystyle \rightleftharpoons } 2 Mn(III) + 2 H 2 O The 3 substrates of this enzyme are Mn(II) , H + , and H 2 O 2 , whereas its two products are Mn(III) and H 2 O .
It is thought that catalase-peroxidase provides protection to cells under oxidative stress. [5] Class II consists of secretory fungal peroxidases: ligninases, or lignin peroxidases (LiPs), and manganese-dependent peroxidases (MnPs). These are monomeric glycoproteins involved in the degradation of lignin. In MnP, Mn 2+ serves as the reducing ...
The reaction has two alternative routes catalysed by two different oxidative enzymes, peroxidases or oxidases. An oxidative enzyme is an enzyme that catalyses an oxidation reaction. Two most common types of oxidative enzymes are peroxidases, which use hydrogen peroxide, and oxidases, which use molecular oxygen.
Almost all human peroxidases are hemoproteins, except glutathione peroxidase. They use hydrogen peroxide as a substrate. Metalloenzymes catalyze reactions using peroxide as an oxidant. [13] Catalases are hemoproteins responsible for the catalysis of converting hydrogen peroxide into water and oxygen. [14]
The most commonly used test is called a TBARS Assay (thiobarbituric acid reactive substances assay). Thiobarbituric acid reacts with malondialdehyde to yield a fluorescent product. However, there are other sources of malondialdehyde, so this test is not completely specific for lipid peroxidation. [14]
Peroxidases have been classified into three types (class I, class II and class III): ascorbate peroxidases is a class I peroxidase enzyme. [5] APXs catalyse the H 2 O 2-dependent oxidation of ascorbate in plants, algae and certain cyanobacteria. [6] APX has high sequence identity to cytochrome c peroxidase, which