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- Catechol_oxidase abstract "Catechol oxidase is an enzyme that catalyses the oxidation of phenols such as catechol. Catechol oxidase is a copper-containing enzyme whose activity is similar to that of tyrosinase, a related class of copper oxidases. They are ubiquitous plant enzymes that catalyze oxidation of a broad range of ortho-diphenols to the corresponding o-quinones coupled with the reduction of oxygen to water. It is different from tyrosinase, Ec 1.14.18.1, which can catalyze both the monooxygenation of monophenols and the oxidation of catechols.Catechol oxidase carries out the oxidation of phenols such as catechol, using dioxygen (O2). In the presence of catechol, benzoquinone is formed (see reaction below). Hydrogens removed from catechol combine with oxygen to form water. This reaction, producing the yellow compound benzoquinone, is a form of enzymatic browning exhibited in many foods upon exposure to oxygen (e.g., in bananas). The benzoquinone is then oxidised by the air to form dark-brown melanin.Catechol is present in small quantities in the vacuoles of cells of many plant tissues. Catechol oxidase is present in the cell cytoplasm. If the plant tissues are damaged, the catechol is released and the enzyme converts the catechol to ortho-quinone, which is a natural antiseptic. Catechol oxidase, therefore, has a role in plant defence mechanisms, helping to protect damaged plants against both bacterial and fungal disease.It has been suggested that the quantity of catechol oxidase produced by a plant may be related to its susceptibility to fungal infection. Benzoquinone inhibits the growth of microorganisms and prevents damaged fruit from rotting.Catechol oxidase activity is also of economic importance. It has been estimated that half the world’s fruit and vegetable crop is lost due to post-harvest browning reactions due to the enzyme.500pxCatechol oxidase has been studied from sweet potatoes and assigned into a biological assembly. The catalytic copper center is accommodated in a central four-helix-bundle located in a hydrophobic pocket close to the surface. Both metal binding sites are composed of three histidine ligands. His 109, ligated to the CuA site, is covalently linked to Cys 92 by an unusual thioether bond. An additional ligand component is Cu2O and contains a Cu-O-Cu linkage.New approaches on artificial enzymes design based on amino acids or peptides as characteristic molecular moieties have led to a significant expansion of the field of artificial enzymes or enzyme mimics. Recent results by the group of Rob Liskamp have shown that scaffolded histidine residues can be used as mimics of certain metalloproteins and -enzymes. Especially the structural mimicry of certain copper proteins (e.g. hemocyanin, tyrosinase and catechol oxidase), containing so-called type-3 copper binding sites, has been shown. This is a significant improvement since the use of scaffolded histidine residues is one step closer to the mimicry of enzymes by biological relevant species such as amino acids and peptides.".
- Catechol_oxidase ecNumber "1.10.3.1".
- Catechol_oxidase thumbnail Catechol-Quinone.svg?width=300.
- Catechol_oxidase wikiPageID "4616398".
- Catechol_oxidase wikiPageLength "5345".
- Catechol_oxidase wikiPageOutDegree "30".
- Catechol_oxidase wikiPageRevisionID "677335535".
- Catechol_oxidase wikiPageWikiLink Allotropes_of_oxygen.
- Catechol_oxidase wikiPageWikiLink Amino_acid.
- Catechol_oxidase wikiPageWikiLink Angewandte_Chemie.
- Catechol_oxidase wikiPageWikiLink Artificial_enzyme.
- Catechol_oxidase wikiPageWikiLink Banana.
- Catechol_oxidase wikiPageWikiLink Benzoquinone.
- Catechol_oxidase wikiPageWikiLink Browning_(chemical_process).
- Catechol_oxidase wikiPageWikiLink Browning_(food_process).
- Catechol_oxidase wikiPageWikiLink Catalysis.
- Catechol_oxidase wikiPageWikiLink Catechol.
- Catechol_oxidase wikiPageWikiLink Category:Copper_enzymes.
- Catechol_oxidase wikiPageWikiLink Category:EC_1.10.3.
- Catechol_oxidase wikiPageWikiLink Category:Enzymes.
- Catechol_oxidase wikiPageWikiLink Category:Natural_phenols_metabolism.
- Catechol_oxidase wikiPageWikiLink Copper_protein.
- Catechol_oxidase wikiPageWikiLink Dioxygen.
- Catechol_oxidase wikiPageWikiLink Edward_I._Solomon.
- Catechol_oxidase wikiPageWikiLink Enzyme.
- Catechol_oxidase wikiPageWikiLink Hemocyanin.
- Catechol_oxidase wikiPageWikiLink Melanin.
- Catechol_oxidase wikiPageWikiLink Metalloprotein.
- Catechol_oxidase wikiPageWikiLink Oxidase.
- Catechol_oxidase wikiPageWikiLink Oxidation.
- Catechol_oxidase wikiPageWikiLink Oxygen.
- Catechol_oxidase wikiPageWikiLink Peptide.
- Catechol_oxidase wikiPageWikiLink Phenol.
- Catechol_oxidase wikiPageWikiLink Redox.
- Catechol_oxidase wikiPageWikiLink Tyrosinase.
- Catechol_oxidase wikiPageWikiLink Water.
- Catechol_oxidase wikiPageWikiLink Yellow.
- Catechol_oxidase wikiPageWikiLink File:Catechol-Quinone.svg.
- Catechol_oxidase wikiPageWikiLinkText "Catechol oxidase".
- Catechol_oxidase wikiPageWikiLinkText "catechol oxidase".
- Catechol_oxidase casNumber "9002-10-02".
- Catechol_oxidase ecNumber "1.1".
- Catechol_oxidase hasPhotoCollection Catechol_oxidase.
- Catechol_oxidase name "Catechol oxidase".
- Catechol_oxidase wikiPageUsesTemplate Template:Cite_journal.
- Catechol_oxidase wikiPageUsesTemplate Template:Diphenol_family_oxidoreductases.
- Catechol_oxidase wikiPageUsesTemplate Template:Enzyme.
- Catechol_oxidase wikiPageUsesTemplate Template:MeshName.
- Catechol_oxidase wikiPageUsesTemplate Template:Reflist.
- Catechol_oxidase subject Category:Copper_enzymes.
- Catechol_oxidase subject Category:EC_1.10.3.
- Catechol_oxidase subject Category:Enzymes.
- Catechol_oxidase subject Category:Natural_phenols_metabolism.
- Catechol_oxidase hypernym Enzyme.
- Catechol_oxidase type Biomolecule.
- Catechol_oxidase type Enzyme.
- Catechol_oxidase type Protein.
- Catechol_oxidase type Thing.
- Catechol_oxidase type Q206229.
- Catechol_oxidase type Q8047.
- Catechol_oxidase comment "Catechol oxidase is an enzyme that catalyses the oxidation of phenols such as catechol. Catechol oxidase is a copper-containing enzyme whose activity is similar to that of tyrosinase, a related class of copper oxidases. They are ubiquitous plant enzymes that catalyze oxidation of a broad range of ortho-diphenols to the corresponding o-quinones coupled with the reduction of oxygen to water.".
- Catechol_oxidase label "Catechol oxidase".
- Catechol_oxidase sameAs Catecolo_ossidasi.
- Catechol_oxidase sameAs カテコールオキシダーゼ.
- Catechol_oxidase sameAs m.0ccvkl.
- Catechol_oxidase sameAs Katehol_oksidaza.
- Catechol_oxidase sameAs Katehol_oksidaza.
- Catechol_oxidase sameAs Q3652158.
- Catechol_oxidase sameAs Q3652158.
- Catechol_oxidase wasDerivedFrom Catechol_oxidase?oldid=677335535.
- Catechol_oxidase depiction Catechol-Quinone.svg.
- Catechol_oxidase isPrimaryTopicOf Catechol_oxidase.
- Catechol_oxidase name "Catechol oxidase".