Heat-stabilities of Electron Transport Related to Photosystem I in a Thermophilic Blue-green Alga, Synechococcus sp.
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概要
- 論文の詳細を見る
Heat-stabilities of photosystem I reactions in a thermophilic blue-green alga, Synechococcus sp. were studied. All the reactions examined were highly resistant to heat as compared with those in ordinary higher plants and algae. Cyt c-553 photooxidation in vivo was abolished by treatment at 75℃ for 5 min. By contrast, P700 photooxidation was extremely resistant to heat and could not be completely inactivated by treatment of the cells or isolated thylakoids at about 100℃ for 5 min. Photooxidation of added Cyt c-553 by isolated thylakoid membranes was more heat-stable than was this activity in cells. This suggests that heat-treatment caused a perturbation in the structural integrity of the membranes which is required for efficient electron transfer from Cyt c-553 to P700 in situ. At higher temperatures, the inactivation of Cyt c-553 photooxidation in the membranes parallels the decrease in the rate of P700 photooxidation. Spectrophotometric studies with short flashes indicated that inactivation of the electron transport from Cyt c-553 to methyl viologen is due to the denaturation of a secondary electron acceptor of photosystem I. A_2, and possibly another acceptor, P430.
- 日本植物生理学会の論文
著者
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Satoh Kazuhiko
Department of Life Science, University of Hyogo, 3-2-1 Kohto, Kamigohri, Ako-gun, Hyogo 678-1297, Ja
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KOIKE Hiroyuki
Department of Life Science, Graduate School of Life Science, University of Hyogo
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Katoh Sakae
Department of Pure and Applied Sciences. College of General Education. University of Tokyo
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Satoh Kazuhiko
Department Of Biology Faculty Of Science Toho University
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Koike Hiroyuki
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Satoh Kazuhiko
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Satoh Kazuhiko
Fac. Science Himeji Institute Of Technology Harima Science Garden City
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Katoh Sakae
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Katoh Sakae
Department Of Biology Faculty Of Science Toho University
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Koike Hiroyuki
Department Of Cardiovascular Surgery Japanese Red Cross Society Wakayama Medical Center
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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