ArticleThe Journal of biological chemistry2011
Thermodynamic limitations of photosynthetic water oxidation at high proton concentrations.
Article in The Journal of biological chemistry, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.
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Who cites it
17 citing papers in PubMed, 44 citations in OpenAlex.
- Tracking the first electron transfer step at the donor side of oxygen-evolving photosystem II by time-resolved infrared spectroscopy.Photosynthesis research · 2024Article
- The chloroplast ATP synthase redox domain inProceedings of the National Academy of Sciences of the United States of America · 2024Article
- Molecular basis for turnover inefficiencies (misses) during water oxidation in photosystem II.Chemical science · 2022Article
- Proton motive force in plant photosynthesis dominated by ΔpH in both low and high light.Plant physiology · 2021Article
- pH-Dependent Protonation of Surface Carboxylate Groups in PsbO Enables Local Buffering and Triggers Structural Changes.Chembiochem : a European journal of chemical biology · 2020Article
- Unequal misses during the flash-induced advancement of photosystem II: effects of the S state and acceptor side cycles.Photosynthesis research · 2019Article
- Energetics and Kinetics of S-State Transitions Monitored by Delayed Chlorophyll Fluorescence.Frontiers in plant science · 2019Article
- Optimization of ATP Synthase c-Rings for Oxygenic Photosynthesis.Frontiers in plant science · 2019Article
- Hacking the thylakoid proton motive force for improved photosynthesis: modulating ion flux rates that control proton motive force partitioning into ΔPhilosophical transactions of the Royal Society of London. Series B, Biological sciences · 2017Review
- Crystal structure and functional characterization of photosystem II-associated carbonic anhydrase CAH3 in Chlamydomonas reinhardtii.Plant physiology · 2015Article
- Efficiency of photosynthetic water oxidation at ambient and depleted levels of inorganic carbon.Photosynthesis research · 2013Article
- Proton transport facilitating water-oxidation: the role of second sphere ligands surrounding the catalytic metal cluster.Photosynthesis research · 2013Review
- Electron transfer from Cyt b(559) and tyrosine-D to the S2 and S3 states of the water oxidizing complex in photosystem II at cryogenic temperatures.Journal of bioenergetics and biomembranes · 2013Article
- Article
- Experimental in vivo measurements of light emission in plants: a perspective dedicated to David Walker.Photosynthesis research · 2012Review
- Alternating electron and proton transfer steps in photosynthetic water oxidation.Proceedings of the National Academy of Sciences of the United States of America · 2012Article
- Proton-coupled electron transfer.Chemical reviews · 2007Review
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In oxygenic photosynthesis, solar energy drives the oxidation of water catalyzed by a Mn(4)Ca complex bound to the proteins of Photosystem II. Four protons are released during one turnover of the water oxidation cycle (S-state cycle), implying thermodynamic limitations at low pH. For proton concentrations ranging from 1 nm (pH 9) to 1 mm (pH 3), we have characterized the low-pH limitations using a new experimental approach: a specific pH-jump protocol combined with time-resolved measurement of the delayed chlorophyll fluorescence after nanosecond flash excitation. Effective pK values were determined for low-pH inhibition of the light-induced S-state transitions: pK(1)=3.3 ± 0.3, pK(2)=3.5 ± 0.2, and pK(3)≈pK(4)=4.6 ± 0.2. Alkaline inhibition was not observed. An extension of the classical Kok model facilitated assignment of these four pK values to specific deprotonation steps in the reaction cycle. Our results provide important support to the extended S-state cycle model and criteria needed for assessment of quantum chemical calculations of the mechanism of water oxidation. They also imply that, in intact organisms, the pH in the lumen compartment can hardly drop below 5, thereby limiting the ΔpH contribution to the driving force of ATP synthesis.
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