Crystal structure of oxygen-evolving photosystem II at a resolution of 1.9 Å.
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The crystal structure of photosystem II is reported, finding that five oxygen atoms served as oxo bridges linking the five metal atoms, and that four water molecules were bound to the Mn4CaO5 cluster; some of them may therefore serve as substrates for dioxygen formation.Abstract:
Photosystem II is the site of photosynthetic water oxidation and contains 20 subunits with a total molecular mass of 350 kDa. The structure of photosystem II has been reported at resolutions from 3.8 to 2.9 angstrom. These resolutions have provided much information on the arrangement of protein subunits and cofactors but are insufficient to reveal the detailed structure of the catalytic centre of water splitting. Here we report the crystal structure of photosystem II at a resolution of 1.9 angstrom. From our electron density map, we located all of the metal atoms of the Mn(4)CaO(5) cluster, together with all of their ligands. We found that five oxygen atoms served as oxo bridges linking the five metal atoms, and that four water molecules were bound to the Mn(4)CaO(5) cluster; some of them may therefore serve as substrates for dioxygen formation. We identified more than 1,300 water molecules in each photosystem II monomer. Some of them formed extensive hydrogen-bonding networks that may serve as channels for protons, water or oxygen molecules. The determination of the high-resolution structure of photosystem II will allow us to analyse and understand its functions in great detail.read more
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Advances in the application of manganese dioxide and its composites as electrocatalysts for the oxygen evolution reaction
TL;DR: In this article, a review exhaustively summarizes MnO2 and its composites with respect to their applications in the oxygen evolution reaction (OER) and the influence of structures and polymorphs on OER properties is thoroughly discussed.
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Proposed mechanisms for water oxidation by Photosystem II and nanosized manganese oxides
Mohamad Mahdi Najafpour,Sima Heidari,S. Esmael Balaghi,Małgorzata Hołyńska,Moayad Hossaini Sadr,Behzad Soltani,Maasoumeh Khatamian,Anthony W. D. Larkum,Suleyman I. Allakhverdiev +8 more
TL;DR: The structure of the water-oxidizing complex and its ligand environment are described with reference to the 1.9Å resolution X-ray-derived crystallographic model of the drinking water oxidation complex from the cyanobacterium Thermosynechococcus vulcanus.
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TL;DR: During electrochemical water oxidation, the catalytic system assembled a catalyst film, which proved not to be cobalt oxide/hydroxide as normally expected, but instead, and for the first time, generated a molecular cobalt complex that incorporated the organic ligand bound to cobalt ions.
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Mechanism of Water Oxidation Catalyzed by a Mononuclear Manganese Complex
TL;DR: Density functional calculations were performed to elucidate the mechanism of water oxidation promoted by this catalyst and explain the relatively low turnover number of this catalyst.
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Mechanisms Underlying Carotenoid Absorption in Oxygenic Photosynthetic Proteins
Maria M. Mendes-Pinto,Denise Galzerano,Alison Telfer,Andrew A. Pascal,Bruno Robert,Cristian Ilioaia +5 more
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