An oxidase is any enzyme that catalyzes an oxidation-reduction reaction involving molecular oxygen (O2) as the electron acceptor. In these reactions, oxygen is reduced to water (H2O) or hydrogen peroxide (H2O2).

The oxidases are a subclass of the oxidoreductases.


An important example is cytochrome c oxidase, the key enzyme that allows the body to employ oxygen in the generation of energy and the final component of the electron transfer chain. Other examples are:

Oxidase test

In microbiology, the oxidase test is used as a phenotypic characteristic for the identification of bacterial strains; it determines whether a given bacterium produces cytochrome oxidases (and therefore utilizes oxygen with an electron transfer chain).

External links

  • Catalase & Oxidase tests video

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Look at other dictionaries:

  • oxídase — |cs| s. f. Diástase que ativa o oxigênio e o fixa ao hidrogênio ou a outros corpos.   ‣ Etimologia: óxido + ase …   Dicionário da Língua Portuguesa

  • oxidase — [äk′si dās΄, äk′sidāz΄] n. [ OXID(IZE) + ASE] any oxidoreductase enzyme that acts as a catalyst in oxidation reactions in which oxygen is the electron acceptor …   English World dictionary

  • Oxidase — Oxidoreduktasen sind Enzyme der ersten Enzymklasse laut der systematischen Nomenklatur der Enzymkommission der International Union of Biochemistry (IUB) und katalysieren Redoxreaktionen. Der systematische Name ist Donor:Acceptor Oxidoreduktases.… …   Deutsch Wikipedia

  • Oxidase-Test — Der Oxidase Test ist ein einfaches und schnelles biochemisches Verfahren zum Nachweis des Enzyms Cytochrom c Oxidase in der Atmungskette von Zellen. Der Oxidase Test wird genutzt zur Klassifikation von Bakterien (Bunte Reihe) und in der… …   Deutsch Wikipedia

  • Oxidase test — DMPD TMPD The oxi …   Wikipedia

  • oxidase — noun Etymology: International Scientific Vocabulary Date: 1896 any of various enzymes that catalyze oxidations; especially one able to react directly with molecular oxygen • oxidasic adjective …   New Collegiate Dictionary

  • oxidase — oxidasic /ok si day sik, zik/, adj. /ok si days , dayz /, n. Biochem. any of a class of oxidoreductases that catalyze the oxidation of a substrate by molecular oxygen with the formation, in most cases, of hydrogen peroxide. [1895 1900; OXIDE +… …   Universalium

  • oxidase — noun Any of many enzymes which catalyze oxidation reactions, especially ones using molecular oxygen …   Wiktionary

  • oxidase — Classically, one of a group of enzymes, now termed oxidoreductases (EC class 1), that bring about oxidation by the addition of oxygen to a metabolite or by the removal of hydrogen or of one or more electrons. O. is now used for those cases in… …   Medical dictionary

  • Oxidase — Oxi|da|se 〈f. 19; Biochem.〉 oxidierend wirkendes Enzym; oV Oxydase * * * O|xi|da|se [↑ Oxidation u. ↑ ase], die; , n: zur Gruppe der ↑ Oxidoreduktasen gehörende Enzyme, die org. Substrate mit Hilfe von mol. Sauerstoff haupts. unter Bildung von… …   Universal-Lexikon

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