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. 1993 Apr;12(3):265-73.
doi: 10.1089/dna.1993.12.265.

Characterization of the DNA-binding properties of the early growth response-1 (Egr-1) transcription factor: evidence for modulation by a redox mechanism

R P Huang  1 , E D Adamson
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Characterization of the DNA-binding properties of the early growth response-1 (Egr-1) transcription factor: evidence for modulation by a redox mechanism

R P Huang et al. DNA Cell Biol. 1993 Apr.

Abstract

The binding of the transcription factor early growth response-1 (Egr-1) to its specific DNA-binding sequence GCGGGGGCG occurs through the interaction of three zinc finger motifs. DNA binding by Egr-1 can be modified by alteration of reduction-oxidation (redox) state. Using gel retardation assays, we show that binding of Egr-1 protein is specific and is dependent on the presence of reducing agents in a dose-dependent manner. The zinc finger region is the domain subject to conformation changes by redox. Oxidized or metal-free Egr-1 does not bind. Nuclear extracts of several cell types contain a heat-sensitive factor(s) that induces the ability of Egr-1 protein to bind to DNA in otherwise suboptimal conditions containing insufficient reducing agent. This inducing activity may be replaced by Ref-1, a protein identified and characterized by Curran and co-workers (Xanthoudakis and Curran, 1992). The possibility arises that the transcription-regulating activity of Egr-1 may be regulated by the redox state in the cell via factors such as Ref-1 that modulate its DNA-binding activity.

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