title: Heterodimerization of thyroid hormone (TH) receptor with H-2RIIBP (RXR beta) enhances DNA binding and TH-dependent transcriptional activation.
abstract: Steroid/TH receptors mediate transcriptional induction of promoters containing hormone response elements (HREs) through an unclear mechanism that involves receptor binding to both hormone and a HRE. Here we demonstrate that both HRE binding and the transcriptional inducing activities of one member of this family, TH receptor, were markedly enhanced by heterodimerization with H-2RIIBP, a non-TH-binding member of the steroid hormone receptor superfamily. H-2RIIBP, the mouse homologue of human retinoic acid-related receptor, was shown to form stable heterodimers with the TH receptor either in solution or when bound to a TH response element. The results presented indicate that it might be necessary for the TH receptor or other members of this superfamily to have specific partners for heterodimer formation to elicit maximal hormone-specific gene regulation from particular HREs.
authors.affiliation: Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD 20892.
authors.forename: P L
authors.initials: PL
authors.lastname: Hallenbeck
authors.forename: M S
authors.initials: MS
authors.lastname: Marks
authors.forename: R E
authors.initials: RE
authors.lastname: Lippoldt
authors.forename: K
authors.initials: K
authors.lastname: Ozato
authors.forename: V M
authors.initials: VM
authors.lastname: Nikodem
mesh_terms: D000818:Animals; D000906:Antibodies; D016367:Baculoviridae / Q000235:genetics; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D015500:Chloramphenicol O-Acetyltransferase / Q000235:genetics / Q000378:metabolism; D004247:DNA / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000302:isolation & purification / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D007313:Insecta; D007700:Kinetics; D046911:Macromolecular Substances; D008715:Methionine / Q000378:metabolism; D008970:Molecular Weight; D051381:Rats; D011988:Receptors, Thyroid Hormone / Q000302:isolation & purification / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D000906:Antibodies; D004268:DNA-Binding Proteins; D046911:Macromolecular Substances; D011988:Receptors, Thyroid Hormone; D011994:Recombinant Proteins; C061606:Rxrb protein, mouse; D004247:DNA; D008715:Methionine; D015500:Chloramphenicol O-Acetyltransferase