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• W2059602275 abstract "O(2) photoreduction by photosynthetic electron transfer, the Mehler reaction, was observed in all groups of oxygenic photosynthetic organisms, but the electron transport chain mediating this reaction remains unidentified. We provide the first evidence for the involvement of A-type flavoproteins that reduce O(2) directly to water in vitro. Synechocystis sp. strain PCC 6803 mutants defective in flv1 and flv3, encoding A-type flavoproteins, failed to exhibit O(2) photoreduction but performed normal photosynthesis and respiration. We show that the light-enhanced O(2) uptake was not due to respiration or photorespiration. After dark acclimation, photooxidation of P(700) was severely depressed in mutants Deltaflv1 and Deltaflv3 but recovered after light activation of CO(2) fixation, which gives P(700) an additional electron acceptor. Inhibition of CO(2) fixation prevented recovery but scarcely affected P(700) oxidation in the wild-type, where the Mehler reaction provides an alternative route for electrons. We conclude that the source of electrons for O(2) photoreduction is PSI and that the highly conserved A-type flavoproteins Flv1 and Flv3 are essential for this process in vivo. We propose that in cyanobacteria, contrary to eukaryotes, the Mehler reaction produces no reactive oxygen species and may be evolutionarily related to the response of anaerobic bacteria to O(2)." @default.
• W2059602275 created "2016-06-24" @default.
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• W2059602275 date "2003-02-01" @default.
• W2059602275 modified "2023-10-14" @default.
• W2059602275 title "Genes Encoding A-Type Flavoproteins Are Essential for Photoreduction of O2 in Cyanobacteria" @default.
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• W2059602275 doi "https://doi.org/10.1016/s0960-9822(03)00046-0" @default.
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