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Electronic state of the Molecular oxygen released by catalase

AutorAlfonso-Prieto, Mercedes; Vidossich, Pietro; Rodríguez-Fortea, Antonio; Carpena, Xavi ; Fita, Ignacio ; Loewen, Peter C.; Rovira, Carme
Fecha de publicación18-dic-2008
EditorAmerican Chemical Society
CitaciónThe journal of physical chemistry, A, Molecules, spectroscopy, kinetics, environment & general theory 112(50): 12842-12848 (2008)
ResumenIn catalases, the high redox intermediate known as compound I (Cpd I) is reduced back to the resting state by means of hydrogen peroxide in a 2-electron reaction [Cpd I (Por+-FeIV=O) + H2O2 → Enz (Por-FeIII) + H2O + O2]. It has been proposed that this reaction takes place via proton transfer toward the distal His and hydride transfer toward the oxoferryl oxygen (H +/H- scheme) and some authors have related it to singlet oxygen generation. Here, we consider the possible reaction schemes and qualitatively analyze the electronic state of the species involved to show that the commonly used association of the H+/H- scheme with singlet oxygen production is not justified. The analysis is complemented with density functional theory (DFT) calculations for a gas-phase active site model of the reactants and products. © 2008 American Chemical Society.
Versión del editorhttp://dx.doi.org/10.1021/jp801512h
Identificadoresdoi: 10.1021/jp801512h
issn: 1089-5639
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