peroxidase

per·ox·i·dase pə-'räk-sə-.dās, -.dāz n an enzyme occurring esp. in plants, milk, and white blood cells and consisting of a protein complex with hematin groups that catalyzes the oxidation of various substances by peroxides

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n.
an enzyme, found mainly in plants but also present in leucocytes and milk, that catalyses the dehydrogenation (oxidation) of various substances in the presence of hydrogen peroxide (which acts as a hydrogen acceptor, being converted to water in the process).

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per·ox·i·dase (pər-okґsĭ-dās) any of a group of enzymes of the oxidoreductase class that catalyze the oxidation of organic substrates by hydrogen peroxide, which is reduced to water [EC 1.11]. These enzymes are heme proteins, found frequently in plants and occasionally in animal tissues. [EC 1.11.1.7] a specific oxidoreductase that catalyzes the reaction of hydrogen peroxide and halide ions to produce cytotoxic acids (such as hypochlorous acid) and other intermediates; these play a role in oxygen-dependent killing of microorganisms and tumor cells. The enzyme is a hemoprotein found in the azurophil granules of neutrophils and the primary lysosomes of monocytes and it has the green color seen in pus. Deficiency of the enzyme, an autosomal recessive or acquired trait, is usually asymptomatic but may predispose affected individuals to severe fungal infections.

Medical dictionary. 2011.

Look at other dictionaries:

  • peroxidase — [pər äk′si dās΄] n. [ PER + OXIDASE] any oxidoreductase enzyme that acts as a catalyst in reactions in which a peroxide is reduced …   English World dictionary

  • Peroxidase — Peroxidases (EC number [http://www.chem.qmul.ac.uk/iubmb/enzyme/EC1/11/1/ 1.11.1.x] ) are a large family of enzymes. A majority of peroxidase protein sequences can be found in the PeroxiBase database. Peroxidases typically catalyze a reaction of… …   Wikipedia

  • Peroxidase — Peroxidasen Enzymklassifikation EC, Kategorie …   Deutsch Wikipedia

  • peroxidase — A haem enzyme that catalyses reduction of hydrogen peroxide by a substrate that loses two hydrogen atoms. Within cells, may be localized in peroxisomes. Coloured reaction products allow detection of the enzyme with high sensitivity, so peroxidase …   Dictionary of molecular biology

  • peroxidase — peroksidazė statusas T sritis chemija apibrėžtis Fermentas, katalizuojantis peroksidų redukciją. atitikmenys: angl. peroxidase rus. пероксидаза …   Chemijos terminų aiškinamasis žodynas

  • peroxidase — noun Date: 1900 an enzyme that catalyzes the oxidation of various substances by peroxides …   New Collegiate Dictionary

  • peroxidase — /peuh rok si days , dayz /, n. Biochem. any of a class of oxidoreductase enzymes that catalyze the oxidation of a compound by the decomposition of hydrogen peroxide or an organic peroxide. [1900 05; PEROXIDE + ASE] * * * …   Universalium

  • peroxidase — noun Any of a class of enzymes that act on substrates such as hydrogen peroxide and organic hydroperoxides such as lipid peroxides …   Wiktionary

  • Peroxidase — Per|oxi|da|se 〈f. 19; Biochem.〉 Peroxid spaltendes Enzym * * * Per|o|xi|da|se [↑ Peroxid u. ↑ ase], die; , n: Gruppenbez. für in Pflanzen u. bes. in Peroxisomen häufig anzutreffende Häm Eisen Proteine, die als Oxidoreduktasen die Oxidation… …   Universal-Lexikon

  • Peroxidase — Per|o|xi|da|se 〈f.; Gen.: , Pl.: n; Biochemie〉 Peroxid spaltendes Enzym …   Lexikalische Deutsches Wörterbuch

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