Organic Acid Metabolism in Cellular Organelles of Vigna cylindrica (Mitorisasage) Cotyledons
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概要
- 論文の詳細を見る
In starchy cotyledons of Vigna cylindrica (L.) Skeels (Mitorisasage) during seed germination, the enzymes of the glyoxylate cycle were located in the matrix of mitochondria. Glyoxysomes were absent. The glyoxylate cycle in the mitochondria supplies organic acids to the tricarboxylic acid cycle. In mitochondria, isocitrate lyase activity was much higher than malate synthase activity. Part of the glyoxylate thus produced in mitochondria may be nonenzymatically converted to formate by H_2O_2 and the formate then converted to CO_2 by peroxidase or by formic dehydrogenase. The activity of superoxide dismutase, which supplies H_2O_2, was higher in mitochondria than in peroxisomes. The remaining glyoxylate in mitochondria is possibly converted to glycine by alanine-glyoxylate aminotransferase or transported to peroxisomes which lacked isocitrate lyase activity but had high malate synthase activity. In peroxisomes, glyoxylate may be also produced from urate, as is suggested by the fairly high activities of uricase, allantoinase and allantoicase. Judging from the enzyme distribution, Vigna peroxisomes should be capable of producing malate, oxalacetate, citrate, isocitrate and α-ketoglutarate.
- 日本植物生理学会の論文
著者
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山本 幸男
Research Institute For Bioresources Okayama University
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Kim Kiu
Department Of Agronomy School Of Agriculture Nagoya University:(present)department Of Horticulture C
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YAMAMOTO Yukio
Departments of Microbiology, Hamamatsu Medical Center
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Nagai Koji
Department Of Mechanical Engineering Faculty Of Engineering Kinki University
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Nagai Koji
Department Of Agronomy School Of Agriculture Nagoya University
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Mukaida Hideshi
Department of Agronomy, School of Agriculture, Nagoya University
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Tezuka Takafumi
Department of Agronomy, School of Agriculture, Nagoya University
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Mukaida Hideshi
Department Of Agronomy School Of Agriculture Nagoya University
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Tezuka Takafumi
Department Of Agronomy Faculty Of Agriculture Nagoya University
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Tezuka Takafumi
Department Of Agronomy School Of Agriculture Nagoya University
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Yamamoto Yukio
Department Of Agricultural Chemistry Faculty Of Agriculture Nagoya University
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