title: Interaction of the hepatic receptor protein for 2,3,7,8-tetrachlorodibenzo-rho-dioxin with DNA.
abstract: 2,3,7,8-Tetrachlorodibenzo-rho-dioxin (TCDD) binds to a specific, high-affinity, low-capacity protein in rat liver cytosol. The TCDD-receptor complex is a large molecule with a Stokes radius of 6.6 nm as determined by gel filtration on calibrated columns. The receptor complex sediments at 5.0 S on glycerol gradients. The calculated molecular weight from the physical parameters was 136 000 and the frictional ratio 1.79. The TCDD-receptor complex binds to DNA-cellulose without preceding heat activation or incubation at high ionic strength. The receptor must first bind TCDD before it can interact with DNA. The DNA-binding ability can be removed from the TCDD receptor by limited proteolysis with trypsin. This treatment does not affect the TCDD-binding site of the receptor. The proteolytic fragment of the TCDD-receptor complex containing the TCDD-binding site but not the ability to bind to DNA appears to be approximately the same  size as the native receptor, as judged from chromatography of Sepharose CL-6B and glycerol gradient centrifugation.
mesh_terms: D000818:Animals; D001665:Binding Sites / Q000187:drug effects; D002499:Centrifugation, Density Gradient; D002850:Chromatography, Gel; D003600:Cytosol / Q000378:metabolism; D004247:DNA / Q000378:metabolism*; D004147:Dioxins / Q000378:metabolism*; D008099:Liver / Q000378:metabolism*; D008297:Male; D008970:Molecular Weight; D000072317:Polychlorinated Dibenzodioxins / Q000378:metabolism*; D051381:Rats; D018336:Receptors, Aryl Hydrocarbon; D011955:Receptors, Drug / Q000378:metabolism*; D014357:Trypsin / Q000494:pharmacology
chemical_list: D004147:Dioxins; D000072317:Polychlorinated Dibenzodioxins; D018336:Receptors, Aryl Hydrocarbon; D011955:Receptors, Drug; D004247:DNA; D014357:Trypsin