A Model for Water Oxidation Complex in Photosystem II
نویسندگان
چکیده
منابع مشابه
Light-induced water oxidation in photosystem II.
The photosystem II core complex (PSIIcc) is the key enzyme of oxygenic photosynthesis, as it catalyzes the light-induced oxidation of water to form dioxgyen and protons. It is located in the thylakoid membrane of cyanobacteria, algae, and plants and consists of 20 protein subunits binding about 100 cofactors. In this review, we discuss what is presently known about the "donor side" of PSIIcc, c...
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There has been much speculation concerning the mechanism for water oxidation by Photosystem 11. Based on recent work on the biophysics of Photosystem I1 and our own work on the reactivity of synthetic manganese complexes, we propose a chemically reasonable mechanistic model for the water oxidation function of this enzyme. An essential feature of the model is the nucleophilic attack by calcium-l...
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Photosystem II (PSII) uses light energy to split water into protons, electrons and O2. In this reaction, nature has solved the difficult chemical problem of efficient four-electron oxidation of water to yield O2 without significant amounts of reactive intermediate species such as superoxide, hydrogen peroxide and hydroxyl radicals. In order to use nature's solution for the design of artificial ...
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A dimanganese(II) bis-aquo complex [Mn2(cmep)2(H2O)2](ClO4)2, (cmep = N-carboxymethylN’-methyl-N,N’-bis(2-pyridylmethyl)-1,2-ethandiamine), catalyzes the oxidation of water by butylhydrogenperoxide (TBHP) to dioxygen with many turnovers and without degradation. O isotope labelling shows the reaction is highly specific: One oxygen atom in the product dioxygen is derived from water, the other is ...
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Photosynthesis is responsible for the sunlight-powered conversion of carbon dioxide and water into chemical energy in the form of carbohydrates and the release of O2 as a by-product. Although many proteins are involved in photosynthesis, the fascinating machinery of Photosystem II (PSII) is at the heart of this process. This tutorial review describes an emerging technique named protein film pho...
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ژورنال
عنوان ژورنال: Journal of Applied Sciences
سال: 2007
ISSN: 1812-5654
DOI: 10.3923/jas.2007.451.454