Progress Toward a Molecular Mechanism of Water Oxidation in Photosystem II

The active site of photosynthetic water oxidation is the oxygen-evolving complex (OEC) in the photosystem II (PSII) reaction center. The OEC is a Mn 4 CaO 5 cluster embedded in the PSII protein matrix, and it cycles through redox intermediates known as S i states ( i = 0-4). Significant progress has...

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Bibliographic Details
Published in:Annual review of physical chemistry 2017-05, Vol.68 (1), p.101-116
Main Authors: Vinyard, David J, Brudvig, Gary W
Format: Article
Language:English
Subjects:
Kinetics
Models, Molecular
Molecules
Oxidation
Oxidation-Reduction
Oxygen
Oxygen - metabolism
oxygen evolution
Photosynthesis
Photosystem II Protein Complex - chemistry
Photosystem II Protein Complex - metabolism
Physical chemistry
Plants - chemistry
Plants - metabolism
Protons
solar fuels
Water
Water - metabolism
Water chemistry
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Summary:The active site of photosynthetic water oxidation is the oxygen-evolving complex (OEC) in the photosystem II (PSII) reaction center. The OEC is a Mn 4 CaO 5 cluster embedded in the PSII protein matrix, and it cycles through redox intermediates known as S i states ( i = 0-4). Significant progress has been made in understanding the inorganic and physical chemistry of states S 0 -S 3 through experiment and theory. The chemical steps from S 3 to S 0 are more poorly understood, however, because the identity of the substrate water molecules and the mechanism of O-O bond formation are not well established. In this review, we highlight both the consensuses and the remaining challenges of PSII research.
ISSN:0066-426X
1545-1593
DOI:10.1146/annurev-physchem-052516-044820