Mechanisms of Electron Flow through the Q_B Site in Photosystem II. 3.Effects of the Presence of Membrane Structure on the Redox Reactions at the Q_B Site
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概要
- 論文の詳細を見る
Reduction kinetics of chloro- or methyl-substituted benzoquinones (BQs) in spinach PSII membrane fragments or n-heptyl-β-D-thioglucoside-extracted PSII core complexes (HTG-PSII) was studied and compared to that in cyanobacterial PSII core complexes [Satoh et al. (1995) Plant Cell Physiol. 36: 597]. It was found that the BQs accept electrons at two sites (the Q_B and PQ sites) in the both spinach preparations as in the cyanobacterial preparation. Maximum turnover rates (V_<max>) and binding affinities (K_m) of the two sites were estimated. Comparison of the values in PSII membrane fragments with those in HTG-PSII showed that removal of the membrane structure or light-harvesting chlorophyll a/b protein complexes from the PSII core complexes had little effect on the characteristics of the Q_B Site, indicating that the HTG-PSII have the intact Q_B site and are good materials to study the site. The K_m and V_<max> values were comparable to those in the cyanobacterial preparation. Low affinity (high K_m values) and high V_<max> values of methyl-substituted BQs to the Q_B site and almost the same rate of intrinsic electron flow through the Q_B site in the both spinach preparations further support the hypothesis that the plastoquinone (PQ) molecule at the Q_B Site is not replaced by another PQ molecule but, after reduction, only its head group goes out of the Q_B Pocket, and comes back after transferring the electrons and protons to a free PQ molecule [Satoh et al. (1993) Z. Naturforsch. 48c: 174].
- 日本植物生理学会の論文
著者
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Kashino Yasuhiro
Department of Life Science, University of Hyogo, 3-2-1 Kohto, Kamigohri, Ako-gun, Hyogo 678-1297, Ja
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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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Kashino Yasuhiro
Department Of Life Science University Of Hyogo 3-2-1 Kohto Kamigohri Ako-gun Hyogo 678-1297 Japan
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Kashino Yasuhiro
Dept. Life Sci. Fac. Sci. Himeji Inst. Tech. Harima Science Garden City
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KOIKE Hiroyuki
Department of Life Science, Graduate School of Life Science, University of Hyogo
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YOSHIO Maki
Himeji Institute of Technology, Faculty of Science, Harima Science Garden City
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Yamashita Mari
Himeji Institute Of Technology Faculty Of Science Harima Science Garden City
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Satoh K
Department Of Life Science University Of Hyogo 3-2-1 Kohto Kamigohri Ako-gun Hyogo 678-1297 Japan
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Satoh Kazuhiko
Department Of Biology Faculty Of Science Toho University
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Koike H
Department Of Life Science Graduate School Of Life Science University Of Hyogo
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Okamoto Yuko
Department Of Otolaryngology Head And Neck Surgery Graduate School Of Medicine Chiba University
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Yamashita Mari
Department of Life Science, Faculty of Science, Himeji Institute of Technology
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Kashino Yasuhiro
Department Of Botany Faculty Of Science University Of Tokyo:(present)department Of Biological Scienc
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Okamoto Yuko
Dept. Life Sci. Fac. Sci. Himeji Inst. Tech. Harima Science Garden City
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Okamoto Yuko
Department Of Internal Medicine National Cancer Center Hospital
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Koike Hiroyuki
Department Of Cardiovascular Surgery Japanese Red Cross Society Wakayama Medical Center
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OKAMOTO Yuko
Institute for Molecular Science
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OKAMOTO Yuko
Department of Theoretical Studies, Institute for Molecular Science:Department of Funct. Mol. Science, The Graduate University for Advanced Studies
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