Light-induced reactions of ubiquinone in photosynthetic bacterium, Chromatium D. II. Effects of inhibitors and other experimental conditions

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概要

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• Light-induced reactions of ubiquinone in starved cells of Chromatium D, were investigated under various experimental conditions. The "low amplitude" photoreduction observed on illumination without addition of substrate under aerobic conditions and the "light-off spikes" observed under anaerobic conditions were shown to be related to the cyclic flow of electrons in the photosynthetic system. Both of these were inhibited by o-phenanthroline, HOQNO and piericidin A. The "high amplitude" photoreduction of ubiquinone observed in the presence of thiosulfate under aerobic conditions was inhibited by PCMB, PMA and KCN. The "high amplitude" photooxidation of ubiquinone in the presence of malate under anaerobic conditions was inhibited by HOQNO, piericidin A, rotenone and PMA. In the presence of KCN and succinate, similar "high amplitude" photooxidation was obtained even under aerobic conditions. Under aerobic conditions the addition of malate did not affect the "high amplitude" photoreduction due to thiosulfate. On the contrary, under anaerobic conditions, the "high amplitude" photooxidation with malate was almost completely abolished by the addition of thiosulfate. This apparent counteraction of the oxidation and reduction of ubiquinone was inferred to represent an optimum state of its efficient turn-over in the non-cyclic electron transport chain of photosynthesis in Chromatium.

• 日本植物生理学会の論文

著者

• Takamiya Kenichiro

  Department Of Biological Sciences Graduate School Of Bioscience And Biotechnology Tokyo Institute Of

• Takamiya Atusi

  Department Of Biophysics And Biochemistry Faculty Of Science University Of Tokyo

• Takamiya Atusi

  Department Of Biochemistry Faculty Of Science University Of Tokyo

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