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• W4311452582 endingPage "1817" @default.
• W4311452582 startingPage "1803" @default.
• W4311452582 abstract "Linear photosynthetic electron flow (LEF) produces NADPH and generates a proton electrochemical potential gradient across the thylakoid membrane to synthesize ATP, both of which are required for CO2 fixation. As cellular demand for ATP and NADPH varies, cyclic electron flow (CEF) between Photosystem I and the cytochrome b6f complex (b6f) produces extra ATP. b6f regulates LEF and CEF via photosynthetic control, which is a pH-dependent b6f slowdown of plastoquinol oxidation at the lumenal site. This protection mechanism is triggered at more alkaline lumen pH in the pgr1 (proton gradient regulation 1) mutant of the vascular plant Arabidopsis (Arabidopsis thaliana), which contains a Pro194Leu substitution in the b6f Rieske Iron-sulfur protein Photosynthetic Electron Transfer C (PETC) subunit. In this work, we introduced the equivalent pgr1 mutation in the green alga Chlamydomonas reinhardtii to generate PETC-P171L. Consistent with the pgr1 phenotype, PETC-P171L displayed impaired NPQ induction along with slower photoautotrophic growth under high light conditions. Our data provide evidence that the ΔpH component in PETC-P171L depends on oxygen availability. Only under low oxygen conditions was the ΔpH component sufficient to trigger a phenotype in algal PETC-P171L where the mutant b6f was more restricted to oxidize the plastoquinol pool and showed diminished electron flow through the b6f complex. These results demonstrate that photosynthetic control of different stringency are established in C. reinhardtii depending on the cellular metabolism, and the lumen pH-sensitive PETC-P171L was generated to read out various associated effects." @default.
• W4311452582 created "2022-12-26" @default.
• W4311452582 creator A5021262783 @default.
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• W4311452582 date "2022-12-14" @default.
• W4311452582 modified "2023-10-14" @default.
• W4311452582 title "Algal PETC-Pro171-Leu suppresses electron transfer in cytochrome<i>b</i>6<i>f</i>under acidic lumenal conditions" @default.
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• W4311452582 doi "https://doi.org/10.1093/plphys/kiac575" @default.
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• W4311452582 hasPublicationYear "2022" @default.
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