Interaction of Benzoquinones with Q^-_A and Q^-_B in Oxygen-Evolving Photosystem II Particles from the TBhermophilic Cyanobacterium Synechococcus elongatus
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概要
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The interactions of benzoquinones with the reduced forms of the bound plastoquinone acceptors, Q_A and Q_B, were studied with oxygen-evolving photosystem II (PS II) particles from the thermophilic cyanobacterium Synechococcus elongatus, which largely lack pool plastoquinone molecules [Takahashi and Katoh (1986) Biochim. Biophys. Acta 845: 183]. Oxygen evolution in the presence of various electron acceptors was determined and flash-induced changes in absorbance in the blue region were analyzed in terms of difference spectra, dependence on the concentra-tion of benzoquinone and on temperature, and sensitivity to 3-(3,4-dichlorophenyl)-1,1-dimethyl-urea (DCMU). The more hydrophobic the quinone molecule, the higher was the rate of oxygen evolution, and the maximum rate of 3,000 μmoles O_2・(mg chlorophyll)^<-1> ・ h^<-1> was recorded in the presence of phenyl- and dichloro-p-benzoquinones. DCMU inhibited oxygen evolution by more than 95%. However, spectrophotometric studies revealed that, even though electrons were transferred to benzoquinones predominantly via Q^<2->_B, the direct oxidation of Q^-_A by added benzoquinones occurred in such a way as to indicate that about 40% of PS II reaction centers were not associated with functional Q_B sites. Q^-_B was very stable in the presence of ferricyanide. How-ever, benzoquinones induced the slow oxidation of Q^-_B. The characteristics of the benzoquinone reductioin in the PS II preparation is discussed.
- 日本植物生理学会の論文
著者
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Satoh Kazuhiko
Department of Life Science, University of Hyogo, 3-2-1 Kohto, Kamigohri, Ako-gun, Hyogo 678-1297, Ja
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Katoh Sakae
Department of Pure and Applied Sciences. College of General Education. University of Tokyo
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Satoh Kazuhiko
Department Of Biology Faculty Of Science Toho University
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Satoh Kazuhiko
Department Of Biology Faculty Of Science University Of Tokyo:(present)department Of Life Sciences Fa
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Katoh Sakae
Department Of Biology Faculty Of Science Toho University
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Tanaka-Kitatani Yuki
Department of Biology, Faculty of Science, University of Tokyo
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Tanaka-kitatani Yuki
Department Of Biology Faculty Of Science University Of Tokyo
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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