ArticleProceedings of the National Academy of Sciences of the United States of America2010
Redox potential of pheophytin a in photosystem II of two cyanobacteria having the different special pair chlorophylls.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers.
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31 citing papers in PubMed, 96 citations in OpenAlex.
- Bio-hybrid photoelectrochemical catalysis for solar fuels and chemicals conversion.Nature communications · 2025Review
- Addition of longer wavelength absorbing chlorophylls into crops could increase their photosynthetic productivity by 26.Nature communications · 2025Article
- Unveiling the charge transport blockade in the D2 branch of the photosystem II reaction center.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Chlorophyll triplet states in thylakoid membranes of Acaryochloris marina. Evidence for a triplet state sitting on the photosystem I primary donor populated by intersystem crossing.Photosynthesis research · 2024Article
- Electronic Structures of Radical-Pair-Forming Cofactors in a Heliobacterial Reaction Center.Molecules (Basel, Switzerland) · 2024Article
- Structure of a unique PSII-Pcb tetrameric megacomplex in a chlorophyllScience advances · 2024Article
- Article
- The antenna of far-red absorbing cyanobacteria increases both absorption and quantum efficiency of Photosystem II.Nature communications · 2022Article
- Far-red light acclimation in diverse oxygenic photosynthetic organisms.Photosynthesis research · 2019Review
- Hydroxyectoine protects Mn-depleted photosystem II against photoinhibition acting as a source of electrons.Photosynthesis research · 2019Article
- Energy transfer from chlorophyll f to the trapping center in naturally occurring and engineered Photosystem I complexes.Photosynthesis research · 2019Article
- Unequal misses during the flash-induced advancement of photosystem II: effects of the S state and acceptor side cycles.Photosynthesis research · 2019Article
- Photosynthesis supported by a chlorophyll f-dependent, entropy-driven uphill energy transfer in Halomicronema hongdechloris cells adapted to far-red light.Photosynthesis research · 2019Article
- Biophotovoltaics: Green Power Generation From Sunlight and Water.Frontiers in microbiology · 2019Review
- Vyacheslav (Slava) Klimov (1945-2017): A scientist par excellence, a great human being, a friend, and a Renaissance man.Photosynthesis research · 2018Article
- Evolution of the Z-scheme of photosynthesis: a perspective.Photosynthesis research · 2017Review
- Photosynthesis at the far-red region of the spectrum in Acaryochloris marina.Biological research · 2017Review
- Chloramphenicol Mediates Superoxide Production in Photosystem II and Enhances Its Photodamage in Isolated Membrane Particles.Frontiers in plant science · 2016Article
- Involvement of molecular oxygen in the donor-side photoinhibition of Mn-depleted photosystem II membranes.Photosynthesis research · 2015Article
- Establishment of the forward genetic analysis of the chlorophyll d-dominated cyanobacterium Acaryochloris marina MBIC 11017 by applying in vivo transposon mutagenesis system.Photosynthesis research · 2015Article
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Authors and funding
7 authors at 4 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Water oxidation by photosystem (PS) II in oxygenic photosynthetic organisms is a major source of energy on the earth, leading to the production of a stable reductant. Mechanisms generating a high oxidation potential for water oxidation have been a major focus of photosynthesis research. This potential has not been estimated directly but has been measured by the redox potential of the primary electron acceptor, pheophytin (Phe) a. However, the reported values for Phe a are still controversial. Here, we measured the redox potential of Phe a under physiological conditions (pH 7.0; 25 degrees C) in two cyanobacteria with different special pair chlorophylls (Chls): Synechocystis sp. PCC 6803, whose special pair for PS II consists of Chl a, and Acaryochloris marina MBIC 11017, whose special pair for PS II consists of Chl d. We obtained redox potentials of -536 +/- 8 mV for Synechocystis sp. PCC 6803 and -478 +/- 24 mV for A. marina on PS II complexes in the presence of 1.0 M betaine. The difference in the redox potential of Phe a between the two species closely corresponded with the difference in the light energy absorbed by Chl a versus Chl d. We estimated the potentials of the special pair of PS II to be 1.20 V and 1.18 V for Synechocystis sp. PCC 6803 (P680) and A. marina (P713), respectively. This clearly indicates conservation in the properties of water-oxidation systems in oxygenic photosynthetic organisms, irrespective of the special-pair chlorophylls.
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