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• W3041036659 abstract "Despite generating an obvious mutant phenotype, whether the Arabidopsis (Arabidopsis thaliana) proton gradient regulation5 (pgr5) mutation influences cyclic electron transport (CET) around PSI is a topic of debate. Results of electrochromic shift analysis show that proton conductivity across the thylakoid membrane (gH+) in the pgr5 mutant is enhanced at high light intensity. Given this observation, PGR5 was proposed to regulate ATP synthase activity rather than mediating CET. The originally reported pgr5 phenotype reflects a smaller proton motive force (pmf) and could be explained by this H+ leakage model. In this study, we genetically reexamined the high-gH+ phenotype of the pgr5 mutant. Transgenic lines in which flavodiiron protein-dependent pseudo-CET replaced PGR5-dependent CET had wild-type levels of gH+, suggesting that the high-gH+ phenotype in pgr5 plants is caused secondarily by the low pmf. The pgr1 mutant shows a similar reduction in pmf because of enhanced sensitivity of its cytochrome b6f complex to lumenal acidification. In contrast to the pgr5 mutant, gH+ was lower in the pgr1 mutant than in the wild type. In the pgr1 pgr5 double mutants, gH+ was intermediate to gH+ values of the respective single mutants. It is unlikely that gH+ is upregulated simply in response to a low pmf. We did not observe uncoupling of the thylakoid membrane in the pgr5 mutant upon monitoring the quenching of 9-aminoacridine fluorescence. We conclude that the gH+ parameter may be influenced by other factors not related to the H+ leakage through ATP synthase. It is unlikely that the pgr5 mutant leaks protons from the thylakoid membrane." @default.
• W3041036659 created "2020-07-16" @default.
• W3041036659 creator A5015432645 @default.
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• W3041036659 date "2020-07-07" @default.
• W3041036659 modified "2023-10-13" @default.
• W3041036659 title "Does the Arabidopsis <i>proton gradient regulation5</i> Mutant Leak Protons from the Thylakoid Membrane?" @default.
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• W3041036659 doi "https://doi.org/10.1104/pp.20.00850" @default.
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