PMID: 41576Dec 6, 1979

Surface potential and reaction of membrane-bound electron transfer components. I. Reaction of P-700 in sonicated chloroplasts with redox reagents

Biochimica Et Biophysica Acta
S Itoh

Abstract

Salt- or pH-induced change of the rate of reduction of the photoxidized membrane bound electron transfer components, P-700, by ionic and nonionic reductants added in the outer medium was studied in sonicated chloroplasts. The rate with the negatively charged reductants increased with the increase of salt concentration at a neutral pH or with the decrease of medium pH. Salts of divalent cations were much more effective than those of monovalent cations. A trivalent cation was even more effective. The rate with a nonionic reductant was little affected by salts. The change of the reduction rate was analysed using the Guoy-Chapman theory, which explains the change of reduction rate by the changes of activities of ionic reductants at the charged membrane surface where the reaction takes place. This analysis gave more useful parameters and explained more satisfactorily the case with high-valence cation salts than the Brönsted type analysis. The values for the surface charge density and the surface potential of the membrane surface in the vicinity of P-700 estimated from the analysis were lower than those estimated for the surface in the vicinity of Photosystem II primary acceptor, suggesting the heterogeneity of the thylakoid surface....Continue Reading

References

Jan 1, 1987·Photosynthesis Research·Z Drechsler, J Neumann
May 1, 1983·Quarterly Reviews of Biophysics·S W Thorne, J T Duniec
Dec 3, 1980·Biochimica Et Biophysica Acta·W HaehnelH Krause
Sep 1, 1983·Archives of Biochemistry and Biophysics·K K Colvert, D J Davis
Oct 3, 1980·Biochimica Et Biophysica Acta·N TamuraM Nishimura
Sep 26, 2003·Biochimica Et Biophysica Acta·Andrei BorodichGunnar Oquist
Jan 14, 1981·Biochimica Et Biophysica Acta·C T Yerkes, G T Babcock
Jul 18, 2006·Photochemistry and Photobiology·Hirozo Oh-oka
Apr 14, 2017·Journal of Bioenergetics and Biomembranes·Jaromír PlášekMilan Hoefer

Related Concepts

Thermodynamics
Cations, Divalent
Resting Potentials
Electron Transport
Menopause
Chloroplasts
Pigments, Biological
Cations
Etioplasts
Thylakoid (Cell Component)

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