Glutathionylation of the alpha-subunit of Na,K-ATPase from rat heart by oxidized glutathione inhibits the enzyme |
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Authors: | Meng Xianyu I Yu Petrushanko E A Klimanova E A Dergousova O D Lopina |
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Institution: | 1. Department of Biochemistry, Biological Faculty, Lomonosov Moscow State University, 119991, Moscow, Russia 2. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, ul. Vavilova 32, 119999, Moscow, Russia
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Abstract: | A partially purified Na,K-ATPase preparation from rat heart containing α1- and α2-isoforms of the enzyme was shown to include both subunits in S-glutathionylated state. Glutathionylation of the α1-subunit (but not of the α2-subunit) was partially removed when the preparation was isolated in the presence of dithiothreitol. The addition of oxidized glutathione irreversibly inhibited both isoforms. Inhibition of the enzyme containing the α1-subunit was biphasic, and the rate constants of the inhibition were 3745 ± 360 and 246 ± 18 M?1·min?1. ATP, ADP, and AMP protected the Na,K-ATPase against inactivation by oxidized glutathione. |
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