Effects of linolenic acid on spinach chloroplast structure
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概要
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The effects of various concentrations of linolenic acid on the membrane structure of chloroplasts were studied in order to correlate them with changes in the capacity of chloroplasts to bind free fatty acid. Linolenic acid induced decrease in absorbance of chloroplasts at 540 nm, especially markedly at concentrations between 20 and 60 μM. Electron microscopic studies revealed that the decrease was largely due to the unfolding of grana stacks. Ratios of bound to free linolenic acid also increased most markedly in the same range of linolenic acid concentration. These results indicate that linolenic acid-induced changes in chloroplast structure are the main cause of the changes in the capacity of chloroplasts to bind free fatty acid. Linolenic acid-induced structure changes of chloroplasts were reversible. Treatment with 100 μM Iinolenic acid transformed chloroplasts into assemblies of numerous vesicles. However, addition of bovine serum albumin restored the original configuration of class II chloroplasts, i.e., grana stacks interwoven by intergrana thylakoids. The mode of action of linolenic acid on the chloroplast structure is discussed in terms of hydrophobic association of grana thylakoids.
- 日本植物生理学会の論文
著者
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Katoh Sakae
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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MURAKAMI Satoru
Department of Applied Mathematics Okayama University of Science
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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Okamoto Takeshi
Department Of Cardiovascular Surgery Niigata City General Hospital
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Okamoto Takeshi
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo:(present)bi
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Murakami Satoru
Department of Biology, College of General Education, University of Tokyo
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