Water oxidation chemistry of photosystem II
نویسندگان
چکیده
منابع مشابه
Water oxidation chemistry of photosystem II.
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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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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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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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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Photosynthetic water oxidation is catalyzed by the Mn4CaO5 cluster of photosystem II. The assembly of the Mn4O5Ca requires light and involves a sequential process called photoactivation. This process harnesses the charge-separation of the photochemical reaction center and the coordination environment provided by the amino acid side chains of the protein to oxidize and organize the incoming mang...
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ژورنال
عنوان ژورنال: Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences
سال: 2002
ISSN: 0962-8436,1471-2970
DOI: 10.1098/rstb.2002.1136