Cationic penetrating antioxidants switch off Mn cluster of photosystem II in situ

Mitochondria-targeted antioxidants (also known as ‘Skulachev Ions’ electrophoretically accumulated by mitochondria) exert anti-ageing and ROS-protecting effects well documented in animal and human cells. However, their effects on chloroplast in photosynthetic cells and corresponding mechanisms are s...

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Veröffentlicht in:Photosynthesis research 2019-11, Vol.142 (2), p.229-240
Hauptverfasser: Ptushenko, Vasily V., Solovchenko, Alexei E., Bychkov, Andrew Y., Chivkunova, Olga B., Golovin, Andrey V., Gorelova, Olga A., Ismagulova, Tatiana T., Kulik, Leonid V., Lobakova, Elena S., Lukyanov, Alexandr A., Samoilova, Rima I., Scherbakov, Pavel N., Selyakh, Irina O., Semenova, Larisa R., Vasilieva, Svetlana G., Baulina, Olga I., Skulachev, Maxim V., Kirpichnikov, Mikhail P.
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container_end_page 240
container_issue 2
container_start_page 229
container_title Photosynthesis research
container_volume 142
creator Ptushenko, Vasily V.
Solovchenko, Alexei E.
Bychkov, Andrew Y.
Chivkunova, Olga B.
Golovin, Andrey V.
Gorelova, Olga A.
Ismagulova, Tatiana T.
Kulik, Leonid V.
Lobakova, Elena S.
Lukyanov, Alexandr A.
Samoilova, Rima I.
Scherbakov, Pavel N.
Selyakh, Irina O.
Semenova, Larisa R.
Vasilieva, Svetlana G.
Baulina, Olga I.
Skulachev, Maxim V.
Kirpichnikov, Mikhail P.
description Mitochondria-targeted antioxidants (also known as ‘Skulachev Ions’ electrophoretically accumulated by mitochondria) exert anti-ageing and ROS-protecting effects well documented in animal and human cells. However, their effects on chloroplast in photosynthetic cells and corresponding mechanisms are scarcely known. For the first time, we describe a dramatic quenching effect of (10-(6-plastoquinonyl)decyl triphenylphosphonium (SkQ1) on chlorophyll fluorescence, apparently mediated by redox interaction of SkQ1 with Mn cluster in Photosystem II (PSII) of chlorophyte microalga Chlorella vulgaris and disabling the oxygen-evolving complex (OEC). Microalgal cells displayed a vigorous uptake of SkQ1 which internal concentration built up to a very high level. Using optical and EPR spectroscopy, as well as electron donors and in silico molecular simulation techniques, we found that SkQ1 molecule can interact with Mn atoms of the OEC in PSII. This stops water splitting giving rise to potent quencher(s), e.g. oxidized reaction centre of PSII. Other components of the photosynthetic apparatus proved to be mostly intact. This effect of the Skulachev ions might help to develop in vivo models of photosynthetic cells with impaired OEC function but essentially intact otherwise. The observed phenomenon suggests that SkQ1 can be applied to study stress-induced damages to OEC in photosynthetic organisms.
doi_str_mv 10.1007/s11120-019-00657-2
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source MEDLINE; SpringerLink Journals - AutoHoldings
subjects Aging
Antioxidants
Antioxidants - metabolism
Biochemistry
Biomedical and Life Sciences
Cations
Cells
Chlorella vulgaris - drug effects
Chlorella vulgaris - metabolism
Chlorophyll
Chlorophyll - metabolism
Chloroplasts
Fluorescence
Hydrophobic and Hydrophilic Interactions
Kinetics
Life Sciences
Light
Manganese - metabolism
Mitochondria
Molecular Docking Simulation
Original Article
Oxygen - metabolism
Photosynthesis
Photosynthetic apparatus
Photosystem II
Photosystem II Protein Complex - metabolism
Plant Genetics and Genomics
Plant Physiology
Plant Sciences
Plastoquinone - analogs & derivatives
Plastoquinone - pharmacology
Spectroscopy
title Cationic penetrating antioxidants switch off Mn cluster of photosystem II in situ
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