Regulation of Aspartokinase Isoenzyme Levels in Cultured Cells of Vinca rosea
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概要
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The levels of aspartokinase isoenzymes were followed as a function of days after transfer of V. rosea cells to fresh medium. When cells were subcultured in a 7-day cycle, both isoenzymes showed peaks at early, but not identical, stages of cell proliferation. Levels of the intracellular amino acids lysine, threonine, isoleucine and methionine decreased as the cellular level of protein increased. As soon as the increase in protein ceased, the amino acid level began to increase. The stationary cells accumulated large amounts of free amino acids. When late stationary cells were used as the inoculum, growth was slow and, as expected, it took longer before the depletion of endogenous free amino acids and the development of aspartokinase isoenzymes was significantly retarded. These results are further evidence that the syntheses of aspartokinase isoenzymes are under repression-derepression control in higher plants as they are in bacterial systems.
- 日本植物生理学会の論文
著者
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Sakano Katsuhiro
Department Of Applied Physiology National Institute Of Agrobiological Resources
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Sakano Katsuhiro
Department Of Botany Faculty Of Science University Of Tokyo
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- Regulation of Aspartokinase Isoenzyme Levels in Cultured Cells of Vinca rosea
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