Vectorial charge transfer reactions on the donor side of manganese-depleted and reconstituted photosystem 2 core complexes

The light-induced functioning of photosystem 2 (PS 2) is directly linked to the translocation of both electrons and protons across the membrane, which results in the formation of transmembrane electric potential difference (ΔΨ). Generation of ΔΨ due to S-state transitions of the water oxidation comp...

Full description

Saved in:
Bibliographic Details
Published in:Biochemistry (Moscow) 2013-04, Vol.78 (4), p.395-402
Main Authors: Petrova, I. O., Kurashov, V. N., Zaspa, A. A., Semenov, A. Yu, Mamedov, M. D.
Format: Article
Language:English
Subjects:
Biochemistry
Biomedical and Life Sciences
Biomedicine
Bioorganic Chemistry
Cyanobacteria
Electron transfer reactions
Kinetics
Life Sciences
Liposomes - chemistry
Liposomes - metabolism
Manganese - deficiency
Manganese - metabolism
Membrane Potentials
Microbiology
Photosynthesis
Photosystem II
Photosystem II Protein Complex - chemistry
Photosystem II Protein Complex - metabolism
Proton-Motive Force
Spinacia oleracea - enzymology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The light-induced functioning of photosystem 2 (PS 2) is directly linked to the translocation of both electrons and protons across the membrane, which results in the formation of transmembrane electric potential difference (ΔΨ). Generation of ΔΨ due to S-state transitions of the water oxidation complex was demonstrated for the first time in Mn-depleted and reconstituted PS 2 core complexes incorporated into liposomes. The kinetics and relative amplitudes of the electrogenic reactions in dark-adapted samples during S 1 →S 2 , S 2 →S 3 , and S 4 →S 0 transitions in response to the first, second and third laser flashes were comparable to those obtained in the intact PS 2 core particles. These results expand current understanding of the nature and mechanisms of electrogenic (vectorial) reactions due to a charge transfer on the donor side of PS 2.
ISSN:0006-2979
1608-3040
DOI:10.1134/S0006297913040081