Proton/Pyruvate Cotransport into Mesophyll Chloroplasts of C_4 Plants : PROTEINS, ENZYMES AND METABOLISM : MEMBRANES AND BIOENERGETICS
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概要
- 論文の詳細を見る
Light-enhanced active pyruvate uptake into mesophyll chloroplasts of C_4 plants was reported to be mimicked by either of the two types of cation jump: H^+-jump in maize and phylogenically related species (H^+-type) and Na^+-jump in all the other C_4 species tested (Na^+-type) [Aoki, N., Ohnishi, J. and Kanai, R. (1992) Plant Cell Physiol. 33:805]. In this study, medium and stromal pH was monitored in the suspension of C_4 mesophyll chloroplasts. Medium alkalization lasting for 5 to 10 seconds after pyruvate addition was detected by a pH electrode and observed only in the light and only in mesophyll chloroplasts from H^+-type species, Zea mays L. and Coix lacryma-jobi L., but not in those from Na^+-type species Panicum miliaceum L., Setaria italica (L.) Beauv. and Panicum maximum Jacq. The initial rate of H^+ consumption showed good correlation with [^<14>C]pyruvate uptake measured by silicone oil filtering centrifugation, both being inhibited by N-ethylmaleimide and 7-chloro-4-nitrobenzo-2-oxa-1,3-diazole to the same degree. The ratio of the rate of H^+ uptake to that of pyruvate uptake was always about 1. Pyruvate-induced acidification of the stroma was observed in maize mesophyll chloroplasts. These results show one to one cotransport of H^+ and pyruvate anion into mesophyll chloroplasts of H^+-type C_4 Species in the light.
- 日本植物生理学会の論文
著者
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Aoki Naohito
Department of Life Sciences, Faculty of Bioresources, Mie University
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Aoki Naohito
Department Of Applied Biological Sciences School Of Agricultural Sciences Nagoya University
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Ohnishi Jun-ichi
Department Of Biochemistry Faculty Of Science Saitama University
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Aoki Naohito
Department Of Biochemistry Faculty Of Science Saitama University
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Kanai Ryuzi
Department of Biochemistry, Saitama University
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Kanai Ryuzi
Department Of Biochemistry And Molecular Biology Faculty Of Science Saitama University
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Ohnishi Jun-ichi
Department Of Biochemistry And Molecular Biology Faculty Of Science Saitama University
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