title: A nuclear hormone receptor-associated protein that inhibits transactivation by the thyroid hormone and retinoic acid receptors.
abstract: Nuclear hormone receptors are transcription factors that require multiple protein-protein interactions to regulate the expression of their target genes. Using the yeast two-hybrid system, we identified a protein, thyroid hormone receptor uncoupling protein (TRUP), that specifically interacts with a region of the human thyroid hormone receptor (TR) consisting of the hinge region and the N-terminal portion of the ligand binding domain in a hormone-independent manner. Interestingly, TRUP inhibits transactivation by TR and the retinoic acid receptor but has no effect on the estrogen receptor or the retinoid X receptor in mammalian cells. We also demonstrate that TRUP exerts its action on TR and retinoic acid receptor by interfering with their abilities to interact with their DNA. TRUP represents a type of regulatory protein that modulates the transcriptional activity of a subclass of the nuclear hormone receptor superfamily by preventing interaction with their genomic response elements.
authors.affiliation: Department of Cell Biology, Baylor College of Medicine, Houston, TX 77030, USA.
authors.forename: T P
authors.initials: TP
authors.lastname: Burris
authors.forename: Z
authors.initials: Z
authors.lastname: Nawaz
authors.forename: M J
authors.initials: MJ
authors.lastname: Tsai
authors.forename: B W
authors.initials: BW
authors.lastname: O'Malley
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D006801:Humans; D008969:Molecular Sequence Data; D011485:Protein Binding; D011960:Receptors, Estrogen / Q000378:metabolism; D018168:Receptors, Retinoic Acid / Q000378:metabolism*; D011988:Receptors, Thyroid Hormone / Q000378:metabolism*; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D047488:Retinoid X Receptors; D012269:Ribosomal Proteins / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism; D015533:Transcriptional Activation
chemical_list: C057838:RPL7A protein, human; D011960:Receptors, Estrogen; D018168:Receptors, Retinoic Acid; D011988:Receptors, Thyroid Hormone; D012097:Repressor Proteins; D047488:Retinoid X Receptors; D012269:Ribosomal Proteins; D014157:Transcription Factors