Glutathione transferase activity of vacuoles, plastids, and tissue extracts of red beetroot

  • E. V. Pradedova
  • O. D. Nimaeva
  • I. S. Truchan
  • R. K. Salyaev


Glutathione transferase (GST) activity revealed in vacuoles of red beetroot (Beta vulgaris L.) cells was investigated in comparison with the GST activity of plastids and extracts of tissues. The level of GST activity determined by spectrophotometric method proved fairly high in water extracts and membrane fractions of isolated vacuoles and plastids, as well as in water extracts of tissues. In the objects studied, pH dependence of the GST activity slightly differed. Optimal pH for the vacuolar GST activity was in the range 7.0–7.5, for the GST of plastids and tissue extracts it was 7.5. The GSTs differed in specificity to the substrates fluorodifen and ethacrynic acid. The activity of the vacuolar and tissue extract GSTs with fluorodifen was significantly higher than that of the GST from plastids. Ethacrynic acid, often used as a competitive inhibitor of GST, almost completely inhibited the GST activity assayed with 1-chloro-2,4-dinitrobenzene as a main substrate. However, ethacrynic acid was a substrate only for the GSTs of vacuoles and tissue extract, but not for the GST of plastids. Using zymography allowing estimation of the GST activity in a gel after electrophoresis of proteins, several zones of enzymatic activity were revealed in all objects that may correspond to different isozymes. It was found that the composition of the vacuolar GST isoforms and their substrate specificity may differ from the GSTs of other cellular structures. It is assumed that vacuole, having quite high activity of GST, should make a significant contribution to intracellular detoxification processes.


Beta vulgaris vacuoles plastids glutathione-S transferases xenobiotics detoxication 





ethacrynic acid




reduced form of glutathione




malate dehydrogenase


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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • E. V. Pradedova
    • 1
  • O. D. Nimaeva
    • 1
  • I. S. Truchan
    • 1
  • R. K. Salyaev
    • 1
  1. 1.Siberian Institute of Plant Physiology and BiochemistrySiberian Branch of the Russian Academy of SciencesIrkutskRussia

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