Mechanism of Electron Flow through the Q_B Site in Photosystem II. 1.Kinetics of the Reduction of Electron Acceptors at the Q_B and Plastoquinone Sites in Photosystem II Particles from the Cyanobacterium Synechococcus vulcanus : MEMBRANES AND BIOENERGETIC
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概要
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Various derivatives of benzoquinone (BQ) were found to be reduced at two sites [the Q_B and plastoquinone (PQ) sites] in photosystem II particles from Synechococcus vulcanus, and the relationship between the structures of BQ_S and the kinetics of such reduction at each site were studied. Affinities of BQ_S for both the Q_B and the PQ site and the maximum turnover rates at the two sites were estimated by computer simulation of the dependence on the concentration of the BQ of the rate of oxygen evolution. Affinities of BQ_S for the Q_B Sites determined by this method agreed well with those determined from competition between BQ_S and DCMU for the Q_B Site. All methyl-substituted BQ_S had low affinities for the Q_B site, and tetramethyl-p-benzoquinone had almost no affinity. An increase in the number of chlorine atoms in the quinone ring increased the affinity, and the position of such substitutions had a great effect on the affinity when two positions on the ring were occupied by two chlorine atoms or methyl groups. The affinities of BQ_S for the PQ site were almost the same for all BQ_S tested in this experiment but the maximum turnover rates at this site varied greatly from one derivative to another. The results are consistent with the hypothesis that the binding of the PQ molecule to the Q_B site is attributable not to its quinone ring but to its isoprenoid chain and, moreover, that the electron transfer through the Q_B site occurs not by replacement of the PQ molecule but by donation of electrons to another PQ molecule.
- 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 Faculty Of Science Himeji Institute Of Technology
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Satoh Kazuhiko
Department Of Biology Faculty Of Science Toho University
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Satoh Kazuhiko
Department Of Pure And Applied Sciences College Of General Education University Of Tokyo
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Kashino Yasuhiro
Department Of Botany Faculty Of Science University Of Tokyo:(present)department Of Biological Scienc
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Satoh Kazuhiko
Fac. Science Himeji Institute Of Technology Harima Science Garden City
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OH-HASHI Miho
Department of Life Science, Faculty of Science, Himeji Institute of Technology
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KOIKE Hiyoyuki
Department of Life Science, Faculty of Science, Himeji Institute of Technology
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Oh-hashi Miho
Department Of Life Science Faculty Of Science Himeji Institute Of Technology
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Koike Hiyoyuki
Department Of Life Science Faculty Of Science Himeji Institute Of Technology
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