Functional sites of plastoquinone in photosynthetic electron transport system

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概要

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• Mild extraction of lyophilized chloroplasts with hexane eliminated Hill activity with 2,6-dichlorophenolindophenol (DCIP) as an electron acceptor, and most of the activity was restored by reconstitution with plastoquinone A. The same extraction did not affect the activity of Photosystem II, determined by the photoreduction of DCIP supported with an artificial electron donor, 1,5-diphenylcarbazide. The fluorescence yield changes of extracted chloroplasts indicated that the electron transport chain between Photosystems I and II was also blocked. The results suggest that plastoquinone functions at both sides of Photosystem II; at the reductive side it acts as an electron carrier, and at the oxidative side as a structural element of the thylakoid membrane necessary for a component to be active in the oxygen-evolution system.

• 日本植物生理学会の論文

著者

• Okayama Shigeki

  Biological Laboratory College Of General Education Kyushu University

• Okayama Shigeki

  Biological Laboratory College Of General Education Kyushu University Ropponmatsu

関連論文

• Induction of the H^+ Release from Thylakoid Membranes by Illumination in the Presence of Protonophores at High Concentrations
• Studies on the Component Responsible for the Oxidation of the Primary Electron Acceptor of Photosystem II in the Presence of 3-(3',4'-Dichlorophenyl)-1,1-Dimethyl Urea : Reactivity to External Reductants
• Two Plastoquinone A Molecules Are Required for Photosystem II Activity : Analysis in Hexane-Extracted Photosystem II Particles
• Reversed-Phase High-Performance Liquid Chromatography of Prenylquinones in Green Leaves Using an Electrochemical Detector
• Simultaneous Determination of Oxidized and Reduced Forms of Plastoquinone A in Spinach Chloroplasts by High-Performance Liquid Chromatography with an Electrochemical Detector
• Functional sites of plastoquinone in photosynthetic electron transport system

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