ArticlePlant physiology2014
Proton gradient regulation 5-mediated cyclic electron flow under ATP- or redox-limited conditions: a study of ΔATpase pgr5 and ΔrbcL pgr5 mutants in the green alga Chlamydomonas reinhardtii.
Article in Plant physiology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 65 papers.
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65 citing papers in PubMed, 148 citations in OpenAlex.
- Importance of cysteine residues in the C-terminal region of PGRL1 for PSI photoprotection in Chlamydomonas reinhardtii.Plant physiology · 2026Article
- Proton motive force partitioning links energy and redox balance to photoprotection and carbon gain.Frontiers in plant science · 2026Review
- Age-Specific Physiological Adjustments ofPlants (Basel, Switzerland) · 2025Article
- Nitric Oxide and Melatonin Cross Talk on Photosynthetic Machinery.Molecules (Basel, Switzerland) · 2025Review
- Tethering ferredoxin-NADP+ reductase to photosystem I promotes photosynthetic cyclic electron transfer.The Plant cell · 2025Article
- Alternative electron pathways of photosynthesis power green algal CO2 capture.The Plant cell · 2024Article
- Light-Driven HPlants (Basel, Switzerland) · 2024Review
- Regulation of Microalgal Photosynthetic Electron Transfer.Plants (Basel, Switzerland) · 2024Review
- Unique photosynthetic strategies employed by closely related Breviolum minutum strains under rapid short-term cumulative heat stress.Journal of experimental botany · 2024Article
- Article
- Dysfunction of Chloroplast Protease Activity MitigatesPlants (Basel, Switzerland) · 2024Article
- Phosphate Limitation Responses in Marine Green Algae Are Linked to Reprogramming of the tRNA Epitranscriptome and Codon Usage Bias.Molecular biology and evolution · 2023Article
- Metabolomic response to high light from pgrl1 and pgr5 mutants of Chlamydomonas reinhardtii.Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology · 2023Article
- Characterizing compensatory mechanisms in the absence of photoprotective qE in Chlamydomonas reinhardtii.Photosynthesis research · 2023Article
- Temperature mapping of non-photochemical quenching in Chlorella vulgaris.Photosynthesis research · 2023Article
- Scaling-up and proteomic analysis reveals photosynthetic and metabolic insights toward prolonged HPhotosynthesis research · 2022Article
- Synthetic biology for improved hydrogen production in Chlamydomonas reinhardtii.Microbial biotechnology · 2022Review
- Systems-wide analysis revealed shared and unique responses to moderate and acute high temperatures in the green alga Chlamydomonas reinhardtii.Communications biology · 2022Article
- Photosystem I light-harvesting proteins regulate photosynthetic electron transfer and hydrogen production.Plant physiology · 2022Article
- Article
5 more citing papers are in PubMed but not listed here.
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13 authors at 7 institutions in 3 countries.
Funding
Abstract
The Chlamydomonas reinhardtii proton gradient regulation5 (Crpgr5) mutant shows phenotypic and functional traits similar to mutants in the Arabidopsis (Arabidopsis thaliana) ortholog, Atpgr5, providing strong evidence for conservation of PGR5-mediated cyclic electron flow (CEF). Comparing the Crpgr5 mutant with the wild type, we discriminate two pathways for CEF and determine their maximum electron flow rates. The PGR5/proton gradient regulation-like1 (PGRL1) ferredoxin (Fd) pathway, involved in recycling excess reductant to increase ATP synthesis, may be controlled by extreme photosystem I acceptor side limitation or ATP depletion. Here, we show that PGR5/PGRL1-Fd CEF functions in accordance with an ATP/redox control model. In the absence of Rubisco and PGR5, a sustained electron flow is maintained with molecular oxygen instead of carbon dioxide serving as the terminal electron acceptor. When photosynthetic control is decreased, compensatory alternative pathways can take the full load of linear electron flow. In the case of the ATP synthase pgr5 double mutant, a decrease in photosensitivity is observed compared with the single ATPase-less mutant that we assign to a decreased proton motive force. Altogether, our results suggest that PGR5/PGRL1-Fd CEF is most required under conditions when Fd becomes overreduced and photosystem I is subjected to photoinhibition. CEF is not a valve; it only recycles electrons, but in doing so, it generates a proton motive force that controls the rate of photosynthesis. The conditions where the PGR5 pathway is most required may vary in photosynthetic organisms like C. reinhardtii from anoxia to high light to limitations imposed at the level of carbon dioxide fixation.
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