ArticleProceedings of the National Academy of Sciences of the United States of America2016
Redox potential of the terminal quinone electron acceptor QB in photosystem II reveals the mechanism of electron transfer regulation.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.
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Who cites it
23 citing papers in PubMed, 77 citations in OpenAlex.
- Interrelated Roles of Chloride and Bicarbonate in Regulating Electron Transport Across Photosystem II inPlants (Basel, Switzerland) · 2026Article
- Predicting the Redox Potentials and Hammett Parameters of Quinone Derivatives with the Information-Theoretic Approach.Entropy (Basel, Switzerland) · 2026Article
- Review
- Physical properties of chlorophyll-quinone conjugates prepared via Friedel-Crafts reaction.Photosynthesis research · 2025Article
- Depletion reveals role of bicarbonate in the photosynthetic electron transport chain ofFrontiers in plant science · 2025Article
- Superexchange Electron Transfer and Protein Matrix in the Charge-Separation Process of Photosynthetic Reaction Centers.The journal of physical chemistry letters · 2024Article
- Illuminating the coevolution of photosynthesis and Bacteria.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
- Artificial photosynthetic cells with biotic-abiotic hybrid energy modules for customized CONature communications · 2023Article
- Using enzymes to tame nitrogen-centred radicals for enantioselective hydroamination.Nature chemistry · 2023Article
- Electron Transfer Route between Quinones in Type-II Reaction Centers.The journal of physical chemistry. B · 2022Article
- Redox properties and regulatory mechanism of the iron-quinone electron acceptor in photosystem II as revealed by FTIR spectroelectrochemistry.Photosynthesis research · 2022Review
- Correlation-Based Network Analysis of the Influence ofInsects · 2022Article
- The Interaction of Water-Soluble Nitroxide Radicals with Photosystem II.Applied magnetic resonance · 2022Article
- Proton-mediated photoprotection mechanism in photosystem II.Frontiers in plant science · 2022Article
- Phenazines as model low-midpoint potential electron shuttles for photosynthetic bioelectrochemical systems.Chemical science · 2021Article
- Electron transport in Tradescantia leaves acclimated to high and low light: thermoluminescence, PAM-fluorometry, and EPR studies.Photosynthesis research · 2020Article
- Acquirement of water-splitting ability and alteration of the charge-separation mechanism in photosynthetic reaction centers.Proceedings of the National Academy of Sciences of the United States of America · 2020Article
- Rethinking the Influence of Chloroplast Movements on Non-photochemical Quenching and Photoprotection.Plant physiology · 2020Article
- Energetics of the exchangeable quinone, QProceedings of the National Academy of Sciences of the United States of America · 2019Article
- SiYGL2 Is Involved in the Regulation of Leaf Senescence and Photosystem II Efficiency inFrontiers in plant science · 2018Article
Corrections and comments
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Authors and funding
3 authors at 1 institution in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Photosystem II (PSII) extracts electrons from water at a Mn4CaO5 cluster using light energy and then transfers them to two plastoquinones, the primary quinone electron acceptor QA and the secondary quinone electron acceptor QB. This forward electron transfer is an essential process in light energy conversion. Meanwhile, backward electron transfer is also significant in photoprotection of PSII proteins. Modulation of the redox potential (Em) gap of QA and QB mainly regulates the forward and backward electron transfers in PSII. However, the full scheme of electron transfer regulation remains unresolved due to the unknown Em value of QB. Here, for the first time (to our knowledge), the Em value of QB reduction was measured directly using spectroelectrochemistry in combination with light-induced Fourier transform infrared difference spectroscopy. The Em(QB (-)/QB) was determined to be approximately +90 mV and was virtually unaffected by depletion of the Mn4CaO5 cluster. This insensitivity of Em(QB (-)/QB), in combination with the known large upshift of Em(QA (-)/QA), explains the mechanism of PSII photoprotection with an impaired Mn4CaO5 cluster, in which a large decrease in the Em gap between QA and QB promotes rapid charge recombination via QA (-).
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.