Abstract
Turnover of the D1 protein of photosystem II (PSII) was studied in mutants of Synechocystis sp. PCC 6803 defective in the desaturation of thylakoid membrane lipids. The lack of polyunsaturated fatty acids from membranes made PSII extremely susceptible to photoinhibition and caused a significant reduction in the D1 protein content of the thylakoid membranes at high irradiances. These results may be attributed to an impaired function in the protein synthesis machinery, most probably at the translational or posttranslational level.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Chloroplasts / metabolism
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Chloroplasts / radiation effects
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Cyanobacteria / genetics
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Cyanobacteria / metabolism*
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Cyanobacteria / radiation effects*
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Fatty Acids, Unsaturated / chemistry
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Fatty Acids, Unsaturated / metabolism
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Intracellular Membranes / metabolism
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Intracellular Membranes / radiation effects
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Light
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Membrane Lipids / chemistry
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Membrane Lipids / metabolism*
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Mutation
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Photochemistry
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Photosynthetic Reaction Center Complex Proteins / genetics
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Photosynthetic Reaction Center Complex Proteins / metabolism*
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Photosynthetic Reaction Center Complex Proteins / radiation effects*
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Photosystem II Protein Complex
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Transcription, Genetic
Substances
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Fatty Acids, Unsaturated
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Membrane Lipids
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Photosynthetic Reaction Center Complex Proteins
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Photosystem II Protein Complex