PMID: 870036May 11, 1977

Dependence of the deactivation reactions of photosystem II on the redox state of plastoquinone pool A varied under anaerobic conditions; Equilibria on the acceptor side of photosystem II

Biochimica Et Biophysica Acta
B Diner

Abstract

Dark adapted spinach chloroplasts and Chlorella with variably reduced plastoquinone pools were given 1 or 2 saturating flashes. Under these conditions the rate of deactivation of state S2 of the oxygen evolving site of Photosystem II (B, Kok, B, Forbush, M. McGloin (1970) Photochem. Photobiol. 11, 457-475) is highly dependent on the pool redox state, undergoing a nearly 10-fold acceleration upon transforming the plastoquinone pool (A) from 100% oxidized to 90% reduced. Deactivation of state S3 is unaffected by the same variation of the pool redox state. These observations are attributed to a high concentration of Photosystem II reduced primary electron acceptor, Q-, coincident with the formation of S2 and a low concentration coincident with the formation of S3, under the conditions of highly reduced plastoquinone pool. Simultaneous determination of Q- and A2- result in an estimated equilibrium constant of 15-20 for reaction Q-B in equilibrium QB- and a value greater than 50 for equilibrium Q-B- in equilibrium QB2-, where B is the secondary electron acceptor described by B. Bouges-Bocquet ((1973) Biochim. Biophys. Acta. 314, 250-256) and B.R. Velthuys and J. Amesz ((1974) Biochim. Biophys. Acta. 333, 85-94). It is proposed that ...Continue Reading

References

Dec 6, 1976·Biochimica Et Biophysica Acta·M P PullesJ G Willemsen
Aug 31, 1973·Biochimica Et Biophysica Acta·B Bouges-Bocquet
Oct 19, 1973·Biochimica Et Biophysica Acta·B R Velthuys, J Amesz
Apr 6, 1971·Biochimica Et Biophysica Acta·S W Thorne, N K Boardman
May 20, 1960·Biochimica Et Biophysica Acta·M AVRON
Jan 18, 1974·Biochimica Et Biophysica Acta·B R Velthuys, J Amesz

Citations

Jun 1, 1996·Photosynthesis Research·Ondrej PrasilP G Falkowski
Jun 1, 1993·Photosynthesis Research·Q J GroomDonald O Ort
Mar 1, 1988·Photosynthesis Research·N K PackhamJ M Briantais
Jul 29, 2005·Photosynthesis Research·Gert Schansker, Reto J Strasser
May 10, 2007·Photosynthesis Research·Szilvia Z TóthReto J Strasser
Jul 27, 2007·Photosynthesis Research·Dmitriy ShevelaJohannes Messinger
Jun 18, 2009·Photosynthesis Research·Fabrice Rappaport, Jérôme Lavergne
Jul 6, 2013·Photosynthesis Research·Dmitriy ShevelaJohannes Messinger
Apr 19, 2002·Journal of Photochemistry and Photobiology. B, Biology·Nicole A Dijkman, Bernd M A Kroon
May 15, 2001·Plant Physiology·W MajeranF A Wollman
Mar 5, 2013·Photosynthesis Research·Gert SchanskerGyőző Garab
Aug 15, 2014·Photosynthesis Research·Hazem M KalajiMarek Zivcak
Dec 31, 2015·Proceedings of the National Academy of Sciences of the United States of America·Yuki KatoTakumi Noguchi
Feb 8, 1979·Biochimica Et Biophysica Acta·G Renger, R Tiemann
Apr 2, 1980·Biochimica Et Biophysica Acta·J Sinclair, C Cousineau
May 9, 1979·Biochimica Et Biophysica Acta·J SinclairS Garland
Aug 14, 1979·Biochimica Et Biophysica Acta·J M BowesS Itoh
Aug 14, 1979·Biochimica Et Biophysica Acta·J H Golbeck, B Kok
Jul 7, 2009·Biochimica Et Biophysica Acta·Wim VredenbergOndrej Prasil
May 9, 1980·Biochimica Et Biophysica Acta·J M Bowes, A R Crofts
Jun 10, 2014·Biochemistry. Biokhimii︠a︡·A Stirbet Govindjee
Sep 7, 2019·Proceedings of the National Academy of Sciences of the United States of America·Sven De CausmaeckerA William Rutherford
Dec 19, 2019·Proceedings of the National Academy of Sciences of the United States of America·Mun Hon CheahJohannes Messinger

Related Concepts

Chlorella
Etioplasts
Diuron
Energy Transfer
Oxidation-Reduction
Dioxygen
Dark Reactions of Photosynthesis
Plastoquinone
Quinones

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