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Biochemistry (Moscow)

, Volume 80, Issue 4, pp 417–423 | Cite as

Effect of cationic plastoquinone SkQ1 on electron transfer reactions in chloroplasts and mitochondria from pea seedlings

  • V. D. SamuilovEmail author
  • D. B. Kiselevsky
Article

Abstract

Plastoquinone bound with decyltriphenylphosphonium cation (SkQ1) penetrating through the membrane in nanomolar concentrations inhibited H2O2 generation in cells of epidermis of pea seedling leaves that was detected by the fluorescence of 2′,7′-dichlorofluorescein. Photosynthetic electron transfer in chloroplasts isolated from pea leaves is suppressed by SkQ1 at micromolar concentrations: the electron transfer in chloroplasts under the action of photosystem II or I (with silicomolybdate or methyl viologen as electron acceptors, respectively) is more sensitive to SkQ1 than under the action of photosystem II + I (with ferricyanide or p-benzoquinone as electron acceptors). SkQ1 reduced by borohydride is oxidized by ferricyanide, p-benzoquinone, and, to a lesser extent, by silicomolybdate, but not by methyl viologen. SkQ1 is not effective as an electron acceptor supporting O2 evolution from water in illuminated chloroplasts. The data on suppression of photosynthetic O2 evolution or consumption show that SkQ1, similarly to phenazine methosulfate, causes conversion of the chloroplast redox-chain from non-cyclic electron transfer mode to the cyclic mode without O2 evolution. Oxidation of NADH or succinate in mitochondria isolated from pea roots is stimulated by SkQ1.

Key words

programmed cell death mitochondria-targeted quinones SkQ1 electron transfer retardation in chloroplasts stimulation in mitochondria 

Abbreviations

Asc

ascorbate

BQ

p-benzoquinone

DCF

2′,7′-dichlorofluorescein

DCMU

3-(3,4-dichlorophenyl)-1,1-dimethylurea

DTPP+

decyltriphenylphosphonium cation

EC

epidermal cells

FeCy

ferricyanide

GC

guard cells

MitoQ

10-(6′-ubiquinonyl)decyltriphenylphosphonium

MV

methyl viologen

PCD

programmed cell death

PMS

phenazine methosulfate

PS I(II)

photosystem I(II)

ROS

reactive oxygen species

SH

salicylhydroxamate

SiMo

silicomolybdate

SkQ1

10-(6′-plastoquinonyl)decyltriphenylphosphonium

SkQ3

10-(6′-methylplastoquinonyl)decyltriphenylphosphonium

SkQR1

10-(plastoquinonyl)decylrhodamine

TMPD

N,N,N′,N′-tetramethyl-p-phenylenediamine

Δψ

electric potential transmembrane difference

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Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  1. 1.Faculty of BiologyLomonosov Moscow State UniversityMoscowRussia

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