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Vol 52(2018) N 2 p. 247-250; DOI 10.1134/S0026893318020024 Full Text

E.A. Dergousova1,2, I.Yu. Petrushanko1, E.A. Klimanova1,2, V.A. Mitkevich1, R.H. Ziganshin3, O.D. Lopina1,2, A.A. Makarov1*

Enhancement of Na,K-ATPase Activity as a Result of Removal of Redox Modifications from Cysteine Residues of the al Subunit: the Effect of Reducing Agents

1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia
2Faculty of Biology, Moscow State University, Moscow, 119991 Russia 3Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997 Russia

*aamakarov@eimb.ru
Received - 2016-11-30; Accepted - 2016-12-06

Na,K-ATPase is a transmembrane enzyme that creates a gradient of sodium and potassium, which is necessary for the viability of animal cells. The activity of Na,K-ATPase depends on the redox status of the cell, decreasing with oxidative stress and hypoxia. Previously, we have shown that the key role in the redox sensitivity of Na,K-ATPase is played by the regulatory glutathionylation of cysteine residues of the catalytic alpha subunit, which leads to the inhibition of the enzyme. In this study, the effect of reducing agents (DTT, ME, TCEP) on the level of glutathionylation of the alpha subunit of Na,K-ATPase from rabbit kidneys and the enzyme activity has been evaluated. We have found that the reducing agents partially deglutathionylate the protein, which leads to its activation. It was impossible to completely remove glutathionylation from the native rabbit kidney protein. The treatment of a partially denatured protein on the PVDF membrane with reducing agents (TCEP, NaBH4) also does not lead to the complete deglutathionylation of the protein. The obtained data indicate that Na,K-ATPase isolated from rabbit kidneys has both regulatory and basal glutathionylation, which appears to play an important role in the redox regulation of the function of Na, K-ATPase in mammalian tissues.

Na,K-ATPase, glutathionylation, cysteine residues, reducing agents



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