ArticleProceedings of the National Academy of Sciences of the United States of America2013
Detection of an intermediary, protonated water cluster in photosynthetic oxygen evolution.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- The Effect of Removal of External Proteins PsbO, PsbP and PsbQ on Flash-Induced Molecular Oxygen Evolution and Its Biphasicity in Tobacco PSII.Current issues in molecular biology · 2024Article
- Orientation of non-spherical protonated water clusters revealed by infrared absorption dichroism.Nature communications · 2018Article
- Water is an active matrix of life for cell and molecular biology.Proceedings of the National Academy of Sciences of the United States of America · 2017Article
- An intrinsically disordered photosystem II subunit, PsbO, provides a structural template and a sensor of the hydrogen-bonding network in photosynthetic water oxidation.The Journal of biological chemistry · 2013Article
- Proton transport facilitating water-oxidation: the role of second sphere ligands surrounding the catalytic metal cluster.Photosynthesis research · 2013Review
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Authors and funding
2 authors.
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Abstract
In photosynthesis, photosystem II evolves oxygen from water by the accumulation of photooxidizing equivalents at the oxygen-evolving complex (OEC). The OEC is a Mn4CaO5 cluster, and its sequentially oxidized states are termed the Sn states. The dark-stable state is S1, and oxygen is released during the transition from S3 to S0. In this study, a laser flash induces the S1 to S2 transition, which corresponds to the oxidation of Mn(III) to Mn(IV). A broad infrared band, at 2,880 cm(-1), is produced during this transition. Experiments using ammonia and (2)H2O assign this band to a cationic cluster of internal water molecules, termed "W5(+)." Observation of the W5(+) band is dependent on the presence of calcium, and flash dependence is observed. These data provide evidence that manganese oxidation during the S1 to S2 transition results in a coupled proton transfer to a substrate-containing, internal water cluster in the OEC hydrogen-bonded network.
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