Peroxidase

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Related to Peroxidases: catalase, peroxidase reaction

peroxidase

[pə′räk·sə‚dās]
(biochemistry)
An enzyme that catalyzes reactions in which hydrogen peroxide is an electron acceptor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Peroxidase

 

any of a group of enzymes of the oxidoreduc-tase class that catalyze the hydrogen-peroxide-mediated or organic-peroxide-mediated oxidation of various polyphenols and aliphatic and aromatic amines, as well as of fatty acids, cytochromes, and glutathione. The peroxidases whose substrates are fatty acids, cytochromes, and glutathione are called fatty-acid peroxidase, cytochrome peroxidase, and glutathione peroxidase, respectively. Depending on the source from which they are isolated, peroxidases vary in molecular weight and substrate specificity. The most widely distributed and well-studied peroxidase is of plant origin, usually obtained from horseradish; its molecular weight is 44,100. The prosthetic group of plant peroxidases resembles heme, which is the prosthetic group of hemoglobin; indeed, hemoglobin does exhibit slight peroxidase activity. Plant peroxidases are important in respiration: together with polyphenol oxidase, they catalyze the oxidative conversion of respiratory chromogens into respiratory pigments.

Small amounts of peroxidase are found in animals, and only in white blood cells and milk. Horseradish peroxidase is used in the laboratory to determine the glucose level of blood and urine and to mark lysosomes in cytochemical studies.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Membranes were then washed in PBS with 1% Triton X-100 and placed with goat anti-rabbit immunoglobulin G (IgG) secondary antibody coupled with horseradish peroxidase (HRP) (dilution 1:1,000; Bossion) for 1 h at room temperature.
Peroxidase (POD) among antioxidant enzymes plays an important role of hydrogen peroxide ([H.sub.2][O.sub.2]) detoxification in cells, thereby protecting cellular components such as proteins and lipids against oxidation (Wi, Chung and Kim., 2006).
Labeo rohita, Iron chloride, Sub-lethal dose, Enzyme activity, Peroxidase.
Moreover, these findings suggest to us that we can apply antithyroid agents, pan-heme peroxidase inhibitors, to drug repositioning for antiasthma drugs.
To ascertain if PIC1 had any inhibitory activity on Hb, which shares with MPO a heme-based mechanism of action, we analyzed the effect of PIC1 on the peroxidase activity of Hb from RBCs.
Luthje, "Membrane-bound class III peroxidases: identification, biochemical properties and sequence analysis of isoenzymes purified from maize (Zea mays L.) roots," Journal of Proteomics, vol.
In case of K2Cr2O7, increase in salt concentration (0-20 ug ml-1) increased peroxidases. At both 10 and 20 ug ml-1 stress, all bacterial strains caused increase (except Kushneria avicenniae AHT at 20 ug ml-1 K2Cr2O7) in peroxidases when compared with respective non-inoculated treatments.
Quantification of peroxidase (PO) revealed the significant distinction in control (0.6g/kg) and treated plants (2.54g/kg), whereas peroxidase contents were also variable among different rhizobacterial treatments.
For biochemical analysis of seedlings peroxidase activity auxin estimation and soluble protein content were noticed.
A enzima peroxidase apresentou variacoes quando a cultura do caupi foi submetida ao estresse hidrico (50% CP); Santos et al.
[6.] Nakano Y, Asada K (1981) Hydrogen peroxide is scavenged by ascorbate-specific peroxidase in spinach chloroplasts.
Peroxidase activity was assayed using the method of Eze et al.