PMID: 11607528Apr 11, 1995Paper

Electrogenic light reactions in photosystem I: resolution of electron-transfer rates between the iron-sulfur centers

Proceedings of the National Academy of Sciences of the United States of America
K SigfridssonP Brzezinski

Abstract

Flash-induced voltage changes (electrogenic events) in photosystem I particles from spinach, oriented in a phospholipid layer, have been studied at room temperature on a time scale ranging from 1 micros to several seconds. A phospholipid layer containing photosystem I particles was adsorbed to a Teflon film separating two aqueous compartments. Voltage changes were measured across electrodes immersed in the compartments. In the absence of added electron donors and acceptors, a multiphasic voltage increase, associated with charge separation, was followed by a decrease, associated with charge recombination. Several kinetic phases were resolved: a rapid (<1 micros) increase, ascribed to electron transfer from the primary electron donor P700 to the iron-sulfur electron acceptor FB, was followed by a slower, biphasic increase with time constants of 30 and 200 micros. The 30-micros phase is assigned to electron transfer from FB to the iron-sulfur center FA. The voltage decrease had a time constant of 90 ms, ascribed to charge recombination from FA to P700. Upon chemical prereduction of FA and FB the 30- and 200-micros phases disappeared and the decay time constant was accelerated to 330 micros, assigned to charge recombination from th...Continue Reading

References

Jan 1, 1977·Proceedings of the National Academy of Sciences of the United States of America·H W TrisslM Montal
Jan 1, 1987·Biochimica Et Biophysica Acta·J H Golbeck
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Citations

Dec 1, 1996·Journal of Bioenergetics and Biomembranes·M D Mamedov Semenov Ayu
Sep 19, 2008·Phytochemistry·Chloë van OostendeGilles J C Basset
Nov 1, 2001·Biochimica Et Biophysica Acta·P Sétif
May 1, 1997·European Journal of Biochemistry·K SigfridssonO Hansson
Nov 4, 2020·Microbial Cell Factories·Angelo Del MondoChristophe Brunet
Nov 16, 2020·Journal of Bioenergetics and Biomembranes·Andrey A ZaspaMahir D Mamedov
Jan 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Alessio AusiliJuan C Gomez-Fernández
Nov 1, 2001·Biochimica Et Biophysica Acta·I R VassilievJ H Golbeck

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