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Theoretical study of the catalytic mechanism of catechol oxidase
Stockholm University, Faculty of Science, Department of Physics.
2007 (English)In: Journal of Biological Inorganic Chemistry, ISSN 0949-8257, E-ISSN 1432-1327, Vol. 12, no 8, 1251-1264 p.Article in journal (Refereed) Published
Abstract [en]

The mechanism for the oxidation of catechol by catechol oxidase has been studied using B3LYP hybrid density functional theory. On the basis of the X-ray structure of the enzyme, the molecular system investigated includes the first-shell protein ligands of the two metal centers as well as the second-shell ligand Cys92. The cycle starts out with the oxidized, open-shell singlet complex with oxidation states Cu-2(II,II) with a mu-eta(2) :eta(2) bridging peroxide, as suggested experimentally, which is obtained from the oxidation of Cu-2(I,I) by dioxygen. The substrate of each half-reaction is a catechol molecule approaching the dicopper complex: the first half-reaction involves Cu(I) oxidation by peroxide and the second one Cu(II) reduction. The quantitative potential energy profile of the reaction is discussed in connection with experimental data. Since no protons leave or enter the active site during the catalytic cycle, no external base is required. Unlike the previous density functional theory study, the dicopper complex has a charge of +2.

Place, publisher, year, edition, pages
2007. Vol. 12, no 8, 1251-1264 p.
Keyword [en]
catechol oxidase, copper enzymes, O-2 cleavage, hybrid density functional theory
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-55742DOI: 10.1007/s00775-007-0293-zISI: 000250206100014OAI: oai:DiVA.org:su-55742DiVA: diva2:406759
Note
authorCount :2Available from: 2011-03-28 Created: 2011-03-28 Last updated: 2017-12-11Bibliographically approved

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