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The dioxin receptor: characterization of its DNA-binding properties
G G Mason1, A Wilhelmsson, S Cuthill
1Department of Medical Nutrition, Karolinska Institutet, Huddinge University Hospital, Sweden.
Journal of Steroid Biochemistry
|January 1, 1988
Summary
The rat dioxin and glucocorticoid receptors exhibit similar binding behaviors to heparin-Sepharose and DNA-cellulose. Ligand activation enhances their affinity, suggesting shared structural domains in these important receptors.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Dioxin and glucocorticoid receptors are critical for cellular responses.
- Understanding their binding properties is key to receptor function.
Purpose of the Study:
- To investigate the binding characteristics of rat hepatic dioxin and glucocorticoid receptors.
- To compare their interactions with polyanionic matrices in vitro and in vivo.
Main Methods:
- Studied receptor binding to heparin-Sepharose and DNA-cellulose.
- Analyzed receptor elution and retention under various ionic strengths.
- Investigated in vivo nuclear receptor extraction and limited proteolysis.
Main Results:
- Unliganded receptors showed low affinity for heparin-Sepharose and no retention on DNA-cellulose.
- Liganded and activated receptors displayed increased affinity for heparin-Sepharose and DNA-cellulose retention.
- In vivo, liganded dioxin receptor required high salt for nuclear extraction, unlike non-liganded forms.
Conclusions:
- Dioxin and glucocorticoid receptors share significant physicochemical similarities.
- These receptors likely possess analogous structural organization concerning functional domains.