ArticlePhotosynthesis research2007
Time-resolved X-ray spectroscopy leads to an extension of the classical S-state cycle model of photosynthetic oxygen evolution.
Article in Photosynthesis research, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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14 citing papers in PubMed, 55 citations in OpenAlex.
- Allosteric Regulation of Glycogen Phosphorylase by Order/Disorder Transition of the 250' and 280s Loops.Biochemistry · 2023Article
- Regulation of light energy conversion between linear and cyclic electron flow within photosystem II controlled by the plastoquinone/quinol redox poise.Photosynthesis research · 2023Article
- Reversible Structural Isomerization of Nature's Water Oxidation Catalyst Prior to O-O Bond Formation.Journal of the American Chemical Society · 2022Article
- Structural isomers of the SPhysiologia plantarum · 2019Article
- Energetics and Kinetics of S-State Transitions Monitored by Delayed Chlorophyll Fluorescence.Frontiers in plant science · 2019Article
- Proton transport facilitating water-oxidation: the role of second sphere ligands surrounding the catalytic metal cluster.Photosynthesis research · 2013Review
- Alternating electron and proton transfer steps in photosynthetic water oxidation.Proceedings of the National Academy of Sciences of the United States of America · 2012Article
- Fast Detection Allows Analysis of the Electronic Structure of Metalloprotein by X-ray Emission Spectroscopy at Room Temperature.The journal of physical chemistry letters · 2012Article
- Thermodynamic limitations of photosynthetic water oxidation at high proton concentrations.The Journal of biological chemistry · 2011Article
- Participation of glutamate-354 of the CP43 polypeptide in the ligation of manganese and the binding of substrate water in photosystem II.Biochemistry · 2011Article
- Article
- Photosynthetic water oxidation at elevated dioxygen partial pressure monitored by time-resolved X-ray absorption measurements.Proceedings of the National Academy of Sciences of the United States of America · 2008Article
- Enthalpy changes during photosynthetic water oxidation tracked by time-resolved calorimetry using a photothermal beam deflection technique.Biophysical journal · 2008Article
- Proton-coupled electron transfer.Chemical reviews · 2007Review
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2 authors at 1 institution in 1 country.
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Abstract
In oxygenic photosynthesis, a complete water oxidation cycle requires absorption of four photons by the chlorophylls of photosystem II (PSII). The photons can be provided successively by applying short flashes of light. Already in 1970, Kok and coworkers [Photochem Photobiol 11:457-475, 1970] developed a basic model to explain the flash-number dependence of O2 formation. The third flash applied to dark-adapted PSII induces the S3-->S4-->S0 transition, which is coupled to dioxygen formation at a protein-bound Mn4Ca complex. The sequence of events leading to dioxygen formation and the role of Kok's enigmatic S4-state are only incompletely understood. Recently we have shown by time-resolved X-ray spectroscopy that in the S3-->S0 transition an interesting intermediate is formed, prior to the onset of O-O bond formation [Haumann et al. Science 310:1019-1021, 2005]. The experimental results of the time-resolved X-ray experiments are discussed. The identity of the reaction intermediate is considered and the question is addressed how the novel intermediate is related to the S4-state proposed in 1970 by Bessel Kok. This leads us to an extension of the classical S-state cycle towards a basic model which describes sequence and interplay of electron and proton abstraction events at the donor side of PSII [Dau and Haumann, Science 312:1471-1472, 2006].
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