Evidence for intermediate S-states as initial phase in the process of oxygen-evolving complex oxidation

Biophysical Journal
Jiri Jablonsky, D Lazár

Abstract

We have analyzed flash-induced period-four damped oscillation of oxygen evolution and chlorophyll fluorescence with the aid of a kinetic model of photosystem II. We have shown that, for simulation of the period-four oscillatory behavior of oxygen evolution, it is essential to consider the so-called intermediate S-state as an initial phase of each of the S(n)-S(n+1), (n = 0, 1, 2, 3) transitions. The intermediate S-states are defined as [S(n)Y(Z)(ox)]-states (n = 0, 1, 2, 3) and are formed with rate constant k(iSn) approximately 1.5 x 10(6) s(-1), which was determined from comparison of theoretical predictions with experimental data. The assumed intermediate S-states shift the equilibrium in reaction P680(+)Y(Z)<-->P680Y(Z)(ox) more to the right and we suggest that kinetics of the intermediate S-states reflects a relaxation process associated with changes of the redox equilibrium in the above reaction. The oxygen oscillation is simulated without the miss and double-hit parameters, if the intermediate S-states, which are not the source of the misses or the double-hits, are included in the simulation. Furthermore, we have shown that the intermediate S-states, together with S(2)Q(A)(-) charge recombination, are prerequisites for th...Continue Reading

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Citations

Jun 23, 2009·Photosynthesis Research·Gernot Renger, Bertram Hanssum
Jul 20, 2012·Photosynthesis Research·Alexandrina Stirbet, Govindjee
Mar 28, 2012·Journal of Experimental Botany·Ralf SteuerRainer Machné
Jan 30, 2015·Environmental Microbiology·Judith M KlattLubos Polerecky
Jan 14, 2017·Frontiers in Bioengineering and Biotechnology·Stefanie Westermark, Ralf Steuer
Jan 25, 2019·PLoS Computational Biology·Debolina SarkarCostas D Maranas
Sep 19, 2012·Indian Journal of Critical Care Medicine : Peer-reviewed, Official Publication of Indian Society of Critical Care Medicine·Michel Georges Dos Santos El HalalPaulo Roberto Antonacci Carvalho
Oct 24, 2019·Annals of Botany·Alexandrina StirbetGovindjee Govindjee
Nov 26, 2020·Advanced Materials·Yong Jae KimWonHyoung Ryu

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