Thioltransferase (glutaredoxin) reactivates the DNA-binding activity of oxidation-inactivated nuclear factor I.

The Journal of Biological Chemistry
S BandyopadhyayR M Gronostajski

Abstract

The reversible oxidative inactivation of transcription factors has been proposed to be important in cellular responses to oxidant stress and in several signal transduction pathways. The nuclear factor I (NFI) family of transcription factors is sensitive to oxidative inactivation due to the presence of a conserved, oxidation-sensitive cysteine residue within the NFI DNA-binding domain. Here we show that restoration of the DNA-binding activity of oxidized NFI-C can be catalyzed in vitro by the cellular enzyme thioltransferase (glutaredoxin) coupled to GSH and GSSG reductase. To test whether GSH-dependent pathways play a role in the maintenance of NFI activity in vivo, we used buthionine sulfoximine, an agent that inhibits GSH synthesis, and N-acetylcysteine, an agent that can replenish intracellular GSH. Pretreatment of HeLa cells with buthionine sulfoximine greatly potentiated the inactivation of NFI by the oxidizing agent diamide. Inclusion of N-acetylcysteine in the culture medium during the recovery period following diamide treatment increased the extent of restoration of NFI activity. These results suggest that maintenance of the DNA-binding activity of NFI proteins during oxidant stress in vivo requires a GSH-dependent path...Continue Reading

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