Artificial Quinones Replace the Function of Quinone Electron Acceptor (Q_A) in the Isolated D1-D2-Cytochrolne b_<559> Photosystem II Reaction Center Complex
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概要
- 論文の詳細を見る
Various benzo- and naphthoquinone derivatives were introduced into the purified photosystem II D1-D2-cytochrome b_<559> reaction center complex, which lacks the intrinsic plastoquinone electron acceptors. Effects of these quinones on the electron transfer reactions in nanoseconds to milliseconds time range were studied at room and cryogenic temperatures. 1) The addition of quinones to the purified photosystem II reaction center complex suppressed the nanosecond charge recombination between oxidized reaction center chlorophyll a (P680^+) and reduced pheophytin a (Ph^-), and stabilized P680^+ up to millisecond time range at 280 K and at 77 K. 2) In the reaction center complex supplemented with dibromothymoquinone (DBMIB), P680 was almost fully oxidized and cyiochrome b_<559> was partially reduced by flash excitation. A semi-quinone-like signal with a peak around 320 nm was also induced but the shift of pheophytin absorption band (C550) was not observed. 3) Halogenated quinones, especially DBMIB, were better electron acceptors than unsubstituted or methylated quinones. 4) The affinities of quinones to the reaction center complex were weakly dependent on their molecular structure.
- 日本植物生理学会の論文
著者
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Itoh Shigeru
Division of Biological Science, Graduate School of Science, Nagoya University
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Katoh S
Himeji Inst. Technol. Hyogo Jpn
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Itoh Shigeru
Natl. Inst. Basic Biol.
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Itoh S
National Institute For Basic Biology
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Satoh K
Okayama Univ. Okayama Jpn
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Satoh Kimiyuki
Department of Brology, Faculty of Science, Okayama University
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Iwaki M
National Inst. Basic Biology Okazaki Jpn
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Satoh Kimiyuki
Division Of Biological Regulation And Photobiology National Institute For Basic Biology:department O
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Satoh Kimiyuki
Natl. Inst. Basic Biol. Okazaki Japan
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Satoh Kimiyuki
Department Of Biology Faculty Of Science Okayama University
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Satoh K
Himeji Inst. Technol. Hyogo Jpn
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NAKANE Hiroyuki
Department of Physics, Graduate School of Science, Nagoya University
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Iwaki Masayo
Division of Bioenergetics, National Institute for Basic Biology
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Nakane Hiroyuki
Department Of Biology Faculty Of Science Okayama University
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Itoh Shigeru
Division Of Bioenergetics National Institute For Basic Biology
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