peroxidase
n. type of enzyme that breaks down hydrogen peroxide and organic peroxides | ||||
Search Dictionary:
Peroxidase definition was found in categories: Language, Idioms & Slang(1) Encyclopedia(1)
Peroxidase Definition from Language, Idioms & Slang Dictionaries & Glossaries
| WordNet 2.0 |
peroxidase
Noun
1. any of a group of enzymes (occurring especially in plant cells) that catalyze the oxidation of a compound by a peroxide
(hypernym) oxidase
(hyponym) glutathione peroxidase
(classification) plant, flora, plant life
Noun
1. any of a group of enzymes (occurring especially in plant cells) that catalyze the oxidation of a compound by a peroxide
(hypernym) oxidase
(hyponym) glutathione peroxidase
(classification) plant, flora, plant life
Peroxidase Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Peroxidase
Peroxidases (EC number 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 the form:
- ROOR' + electron donor (2 e-) + 2H+ → ROH + R'OH
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 redox-active cysteine or selenocysteine residues.
The nature of the electron donor is very dependent on the structure of the enzyme.
- For example, horseradish peroxidase can use a variety of organic compounds as electron donors and acceptors. Horseradish peroxidase has an accessible active site and many compounds can reach the site of the reaction.
- For an enzyme such as cytochrome c peroxidase, the compounds that donate electrons are very specific, because there is a very closed active site.
| See more at Wikipedia.org... |