Stimulation of Glutamyl-tRNA Reductase Activity by Benzyladenine in Greening Cucumber Cotyledons : GROWTH AND DEVELOPMENT : PROTEINS, ENZYMES AND METABOLISM
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概要
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The effects of benzyladenine (BA) on the synthesis of 5-aminolevulinic acid (ALA) in plastids were studied by analyzing the BA-induced modulation of the activities of the three enzymes involved in the ALA-synthesis system. The activities of enzymes were assayed in stromal fractions from plastids isolated from BA-treated and untreated cotyledons. BA doubled the overall rate of synthesis of ALA as compared to rates in untreated dark and light-illuminated control cotyledons. BA stimulated the formation of glutamyl-tRNA, the product of the aminoacylation reaction catalyzed by glutamyl-tRNA synthetase. An RNA digestion assay showed, however, that the stimulation was due to an increase in levels of endogenous tRNA^<Glu>, which is the substrate of the synthetase, and not to an increase in the activity of the synthetase itself. The stromal fraction from BA-treated cotyledons had about twice the glutamyl-tRNA reductase activity of untreated dark and light-illuminated control cotyledons. The activity of the reductase was almost the same as the overall ALA-synthetic activity under all conditions tested. RNA gel blot analysis showed that BA increased the levels of the transcript for the reductase in darkness and in the light. The activity of glutamate 1-semialdehyde aminotransferase, which catalyzes the final reaction in the synthesis of ALA, was unchanged by treatment with BA. The present results indicate that stimulation of the synthesis of ALA by BA was caused by increased levels of glutamyl-tRNA reductase and that the reductase is the regulatory and rate-determining enzyme in the ALA-synthesis system except in untreated etioplasts, in which the level of glutamyl-tRNA may be a rate-determining factor.
- 日本植物生理学会の論文
著者
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SHIRANO Yumiko
Mitsui Plant Biotechnology Research Institute
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Shioi Y
Mitsui Plant Biotechnology Research Institute
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Shioi Yuzo
Department Of Biological Sciences Faculty Of Bioscience And Biotechnology Tokyo Institute Of Technol
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Ohta Hiroyuki
Dept. Biol. Sci. Tokyo Inst. Technol.
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Takamiya Ken-ichiro
Department Of Biological Sciences Faculty Of Bioscience And Biotechnology Tokyo Institute Of Technol
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Masuda Tatsuru
Department Of Biological Sciences Graduate School Of Bioscience And Biotechnology Tokyo Institute Of
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Ohta Hiroyuki
Department Of Biological Sciences Graduate School Of Bioscience And Biotechnology Tokyo Institute Of
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Tsuji H
Department Of Botany Faculty Of Science Kyoto University:(present)department Of Biology Kobe Women&a
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Tsuji Hideo
Depatment of Biology, Kobe Women's University
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Takamiya Ken-ichiro
Department Of Biological Sciences Faculty Of Bioscience And Biotechnology
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Shioi Yuzo
Department Of Biological Science Faculty Of Science Shizuoka University
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