ArticleThe Biochemical journal2007
The plastome-encoded PsaJ subunit is required for efficient Photosystem I excitation, but not for plastocyanin oxidation in tobacco.
Article in The Biochemical journal, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers.
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40 citing papers in PubMed.
- Two proteins co-expressed with photosynthetic regulators affect photosynthetic dynamics linked to changes in thylakoid pigment content and composition.Plant biology (Stuttgart, Germany) · 2026Article
- Comparative Chloroplast Genomics of Sugar Beet and Wild Relatives: Insights into Photosystem Gene Regulation and Stress Tolerance.Functional & integrative genomics · 2026Article
- Comparative genomics analyses reveal genomic variation and evolutionary adaptation in Dendrobium orchids.Nature communications · 2025Article
- Reverse genetics in the Arabidopsis chloroplast genome identifies rps16 as a transcribed pseudogene.The Plant journal : for cell and molecular biology · 2025Article
- CO-EXPRESSED WITH PSI ASSEMBLY1 (CEPA1) is a photosystem I assembly factor in Arabidopsis.The Plant cell · 2024Article
- Structure, function, and assembly of PSI in thylakoid membranes of vascular plants.The Plant cell · 2024Review
- Membrane protein provision controls prothylakoid biogenesis in tobacco etioplasts.The Plant cell · 2024Article
- Removal of the large inverted repeat from the plastid genome reveals gene dosage effects and leads to increased genome copy number.Nature plants · 2024Article
- Uncovering the photosystem I assembly pathway in land plants.Nature plants · 2024Article
- Eukaryote-specific assembly factor DEAP2 mediates an early step of photosystem II assembly in Arabidopsis.Plant physiology · 2023Article
- Transgene insertion into the plastid genome alters expression of adjacent native chloroplast genes at the transcriptional and translational levels.Plant biotechnology journal · 2023Article
- Phylogenetic relationship and comparative analysis of the main Bupleuri Radix species in China.PeerJ · 2023Article
- Chloroplast translational regulation uncovers nonessential photosynthesis genes as key players in plant cold acclimation.The Plant cell · 2022Article
- Plastome-based phylogeny and biogeography ofFrontiers in plant science · 2022Article
- A photosynthesis operon in the chloroplast genome drives speciation in evening primroses.The Plant cell · 2021Article
- Stromal NADH supplied by PHOSPHOGLYCERATE DEHYDROGENASE3 is crucial for photosynthetic performance.Plant physiology · 2021Article
- The availability of neither D2 nor CP43 limits the biogenesis of photosystem II in tobacco.Plant physiology · 2021Article
- HPlant physiology · 2020Article
- Highly Resolved Systems Biology to Dissect the Etioplast-to-Chloroplast Transition in Tobacco Leaves.Plant physiology · 2019Article
- Ectopic expression of the apple nucleus-encoded thylakoid protein MdY3IP1 triggers early-flowering and enhanced salt-tolerance in Arabidopsis thaliana.BMC plant biology · 2018Article
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5 authors.
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Abstract
The functions of several small subunits of the large photosynthetic multiprotein complex PSI (Photosystem I) are not yet understood. To elucidate the function of the small plastome-encoded PsaJ subunit, we have produced knockout mutants by chloroplast transformation in tobacco (Nicotiana tabacum). PsaJ binds two chlorophyll-a molecules and is localized at the periphery of PSI, close to both the Lhca2- and Lhca3-docking sites and the plastocyanin-binding site. Tobacco psaJ-knockout lines do not display a visible phenotype. Despite a 25% reduction in the content of redox-active PSI, neither growth rate nor assimilation capacity are altered in the mutants. In vivo, redox equilibration of plastocyanin and PSI is as efficient as in the wild-type, indicating that PsaJ is not required for fast plastocyanin oxidation. However, PsaJ is involved in PSI excitation: altered 77 K chlorophyll-a fluorescence emission spectra and reduced accumulation of Lhca3 indicate that antenna binding and exciton transfer to the PSI reaction centre are impaired in DeltapsaJ mutants. Under limiting light intensities, growth of DeltapsaJ plants is retarded and the electron-transport chain is far more reduced than in the wild-type, indicating that PSI excitation might limit electron flux at sub-saturating light intensities. In addition to defining in vivo functions of PsaJ, our data may also have implications for the interpretation of the crystal structure of PSI.
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