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• W2786394493 abstract "The repair of photosystem II (PSII) is particularly sensitive to oxidative stress and the inhibition of repair is associated with oxidative damage to the translational elongation system in the cyanobacterium Synechocystis sp. PCC 6803. However, the molecular mechanisms underlying this inhibition are unknown. We previously demonstrated in vitro that EF-Tu, a translation factor that delivers aminoacyl-tRNA to the ribosome, is inactivated by reactive oxygen species via oxidation of the Cys residue Cys-82. In this study, we examined the physiological role of the oxidation of EF-Tu in Synechocystis. Under strong light, EF-Tu was rapidly oxidized to yield oxidized monomers in vivo. We generated a Synechocystis transformant that expressed mutated EF-Tu in which Cys-82 had been replaced with a Ser residue. Under strong light, the de novo synthesis of proteins that are required for PSII repair, such as D1, was enhanced in the transformant and photoinhibition of PSII was alleviated. However, photodamage to PSII, measured in the presence of lincomycin, was similar between the transformant and wild-type cells, suggesting that expression of mutated EF-Tu might enhance the repair of PSII. Alleviating photoinhibition through mutation of EF-Tu did not alter cell growth under strong light, perhaps due to the enhanced production of reactive oxygen species. These observations suggest that the oxidation of EF-Tu under strong light inhibits PSII repair, resulting in the stimulation of photoinhibition." @default.
• W2786394493 created "2018-02-23" @default.
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• W2786394493 date "2018-02-08" @default.
• W2786394493 modified "2023-09-27" @default.
• W2786394493 title "Oxidation of Translation Factor EF-Tu Inhibits the Repair of Photosystem II" @default.
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• W2786394493 doi "https://doi.org/10.1104/pp.18.00037" @default.
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