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Water Oxidation in Photosystem II: Structure and Function of Nature’s Mn4CaO5 Cluster
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Chemical Biological Center (KBC))
2011 (English)Conference paper (Other academic)
Abstract [en]

Photosynthesis is Nature‟s way of utilizing solar energy. Photosystem II (PSII) is the unique pigment-protein complex of photosynthesis that is able to perform visible light-driven oxidation of water into O2, protons and energized electrons. The catalytic site of water-oxidation in PSII is referred to as the water-oxidizing complex (WOC) and contains a Mn4CaO5 cluster that accumulates in a cyclic reaction four oxidizing equivalents before water-oxidation occurs. Since it is possible to combine protons and electrons in a subsequent step to H2, PSII is frequently viewed as blueprint for developing man-made catalysts for storing solar energy in the chemical bonds of H2 and O2.1 This talk will report on recent dramatic improvements regarding the understanding of the geometric and electronic structures of the WOC and especially of its Mn4CaO5 cluster. These improvements are based on X-ray crystallographic data by Zouni et al.2 and Shen and coworkers3, but crucial information also comes from EXAFS4-11 and EPR/ENDOR studies12-16 and from theoretical calculations17-20. Furthermore the energetic of the O2 release step21 will be discussed and the mode of substrate water binding22. Possible mechanism for photosynthetic water-oxidation23-25 and activity measurements of synthetic Mn4CaO5 complexes will be briefly covered26-28.

Place, publisher, year, edition, pages
2011. 23-23 p.
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-45202OAI: diva2:427118
JSPS – RSAS Joint Conference, Capturing the Sun, Stockholm, 30-31 May, 2011
Organizers: Japan Society for the Promotion of Science (JSPS) Stockholm Office, Royal Swedish Academy of Sciences (RSAS) Location: Beijer hall, Royal Swedish Academy of Sciences. Invited speakerAvailable from: 2011-06-27 Created: 2011-06-27 Last updated: 2011-10-15Bibliographically approved

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Messinger, Johannes
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