Mechanism of light induced water splitting in Photosystem II of oxygen evolving photosynthetic organisms

Biochimica Et Biophysica Acta
G Renger

Abstract

The reactions of light induced oxidative water splitting were analyzed within the framework of the empirical rate constant-distance relationship of non-adiabatic electron transfer in biological systems (C. C. Page, C. C. Moser, X. Chen , P. L. Dutton, Nature 402 (1999) 47-52) on the basis of structure information on Photosystem II (PS II) (A. Guskov, A. Gabdulkhakov, M. Broser, C. Glöckner, J. Hellmich, J. Kern, J. Frank, W. Saenger, A. Zouni, Chem. Phys. Chem. 11 (2010) 1160-1171, Y. Umena, K. Kawakami, J-R Shen, N. Kamiya, Crystal structure of oxygen-evolving photosystem II at a resolution of 1.9Å. Nature 47 (2011) 55-60). Comparison of these results with experimental data leads to the following conclusions: 1) The oxidation of tyrosine Y(z) by the cation radical P680(+·) in systems with an intact water oxidizing complex (WOC) is kinetically limited by the non-adiabatic electron transfer step and the extent of this reaction is thermodynamically determined by relaxation processes in the environment including rearrangements of hydrogen bond network(s). In marked contrast, all Y(z)(ox) induced oxidation steps in the WOC up to redox state S(3) are kinetically limited by trigger reactions which are slower by orders of magnitude th...Continue Reading

References

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Citations

Oct 29, 2013·Photosynthesis Research·Taras K AntalEsa Tyystjärvi
Apr 15, 2014·Journal of Photochemistry and Photobiology. B, Biology·Mohammad Mahdi NajafpourSuleyman I Allakhverdiev
Dec 31, 2015·Inorganic Chemistry·Hiroshi IsobeKizashi Yamaguchi
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Oct 6, 2015·Biochimica Et Biophysica Acta·Håkan NilssonJérôme Lavergne
Aug 28, 2013·Biochimica Et Biophysica Acta·Katrin Linke, Felix M Ho
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Jun 18, 2016·Photosynthesis Research·Ulrich SiggelJohannes Messinger
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Sep 23, 2016·Journal of the American Chemical Society·M Kyle BrennamanThomas J Meyer
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Jun 22, 2017·Journal of the American Chemical Society·Shin Nakamura, Takumi Noguchi
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May 7, 2020·Physical Chemistry Chemical Physics : PCCP·Casper de Lichtenberg, Johannes Messinger
Jun 23, 2020·Physical Chemistry Chemical Physics : PCCP·Mandeep K ChahalJonathan P Hill

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