NDLI: Functional identification of ATP-sensitive K$^{+}$ uniporter in mitochondria from sugar beet taproot

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Russian Journal of Plant Physiology : Volume 52, Issue 1, January 2005

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Functional identification of ATP-sensitive K$^{+}$ uniporter in mitochondria from sugar beet taproot

Content Provider	Springer Nature Link
Author	Shugaev, A. G. Andreev, I. M. Vyskrebentseva, E. I.
Copyright Year	2005
Abstract	Mitochondria isolated from sugar beet (Beta vulgaris L.) taproot were shown to swell spontaneously after the transfer from a sucrose-containing isolation medium to isoosmotic potassium chloride solutions. The kinetics of this process was strongly retarded after the replacement of potassium with sodium in the incubation medium and was substantially stimulated by the electron-transport chain activity and valinomycin. At neutral pH of the incubation medium, the rate of K$^{+}$-dependent swelling of mitochondria decreased by 30–50% after adding 1 mM ATP but was insensitive to other nucleotides (GTP, UTP, and CTP). In the medium acidified to pH 6.0, the addition of ATP caused shrinkage of mitochondria that had been swollen in the KCl medium. In the absence of this nucleotide, the kinetics of K$^{+}$-dependent swelling of mitochondria was considerably decelerated upon the acidification of the incubation medium. The effects of ATP were independent of the presence or absence of oligomycin and atractyloside. However, the ATP-dependent shrinkage of mitochondria was inhibited in the presence of quinine, and this agent also inhibited K$^{+}$-dependent swelling of organelles in potassium acetate solutions. The presence of K$^{+}$ ions in the incubation medium caused a rapid dissipation of the mitochondrial membrane potential (Δψ) that was generated during succinate oxidation. The addition of ATP to the reaction medium resulted in the oligomycin-insensitive restoration of Δψ. The results are regarded as evidence that the membrane of taproot mitochondria is endowed with functionally active ATP-sensitive K$^{+}$ uniporter. This system is likely to represent a K$^{+}$ channel that catalyzes the electrogenic transfer of potassium ions to the mitochondrial matrix. It is supposed that the membrane of taproot mitochondria also contains a quinine-sensitive K$^{+}$/H$^{+}$ antiporter that catalyzes the efflux of potassium from the matrix or, on the contrary, the accumulation of K$^{+}$ in the presence of potassium acetate.
Starting Page	182
Ending Page	188
Page Count	7
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	52
Issue Number	2
e-ISSN	16083407
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2005-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Beta vulgaris taproot mitochondria potassium transport Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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Effect of KCl Medium on Malate Oxidation in Mitochondria of Sugar Beet Taproot

Effect of KCl-medium on succinate oxidation and hydrogen peroxide generation in mitochondria of sugar beet taproot

Cyanide-and rotenone-resistant respiration in mitochondria of sugar beet taproots during plant growth and development

Effects of potassium deficiency and replacement of potassium by sodium on sugar beet plants

Activities of antioxidant enzymes in mitochondria of growing and dormant sugar beet roots

Genome-wide identification, characterization, and expression patterns of the BZR transcription factor family in sugar beet (Beta vulgaris L.)

Protein synthesis is the most sensitive process when potassium is substituted by sodium in the nutrition of sugar beet (Beta vulgaris).

Integration of Transcriptomic and Proteomic Profiles Reveals Multiple Levels of Genetic Regulation of Taproot Growth in Sugar Beet (Beta vulgaris L.)

Proteomic changes induced by potassium deficiency and potassium substitution by sodium in sugar beet

Functional identification of ATP-sensitive K$^{+}$ uniporter in mitochondria from sugar beet taproot

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Functional identification of ATP-sensitive K$^{+}$ uniporter in mitochondria from sugar beet taproot