Region-specific anti-thyroid hormone receptor (TR) antibodies detect changes in TR structure due to ligand-binding and dimerization.

Published

Journal Article

There are multiple factors that potentially can induce structural changes in DNA-bound thyroid hormone receptors (TRs) including protein-protein interactions, ligand-binding to TRs, and the thyroid hormone response element (TRE) sequence. We used a battery of anti-TR antibodies that recognize the amino-terminal, hinge, or carboxy-terminal regions of TRs to study changes in the epitope regions of in vitro translated TRs in electrophoretic mobility shift assays. We found that the carboxy-terminal and hinge region antibodies recognized TR homodimers but not TR/T3-receptor auxiliary protein or TR/retinoid X receptor heterodimers. The amino-terminal antibodies detected conformational changes due to ligand binding. In contrast, each antibody recognized TR complexes bound to TREs containing half-sites arranged in three different orientations. These results suggest that dimerization with nuclear proteins and ligand-binding, rather than the orientation of TRE half-sites, cause changes in several TR subregions.

Full Text

Duke Authors

Cited Authors

  • Yen, PM; Sugawara, A; Forgione, M; Spanjaard, RA; Macchia, E; Cheng, SY; Chin, WW

Published Date

  • November 1993

Published In

Volume / Issue

  • 97 / 1-2

Start / End Page

  • 93 - 99

PubMed ID

  • 7511545

Pubmed Central ID

  • 7511545

International Standard Serial Number (ISSN)

  • 0303-7207

Language

  • eng

Conference Location

  • Ireland