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. 1995 Sep;15(9):4718–4726. doi: 10.1128/mcb.15.9.4718

Ligand-dependent and -independent transactivation by thyroid hormone receptor beta 2 is determined by the structure of the hormone response element.

M Sjöberg 1, B Vennström 1
PMCID: PMC230715  PMID: 7651389

Abstract

Chicken thyroid hormone receptor beta 2 (cTR beta 2) is likely to serve specific functions in gene regulation since it possesses a unique N-terminal domain and is expressed in very few tissues. We demonstrate here that TR beta 2 exhibits distinct transactivation properties which are dependent on the availability of ligand and on the structure of the hormone response element. First, a strong ligand-independent transactivation was observed with hormone response elements composed of direct repeats and everted repeats. Second, TR beta 2 was induced by triiodothyronine to transactivate more efficiently than TR beta 0 on palindromic and everted-repeat types of hormone response elements. However, coexpression of the retinoid X receptor reduced the strong transactivation by TR beta 2 but not by TR beta 0 via palindromic response elements, suggesting that TR beta 2 can transactivate as a homodimer. Finally, the N terminus of TR beta 2 contains two distinct transactivation regions rich in tyrosines, which are essential for transactivation. Our results thus show that the activity of the novel transactivating region of TR beta 2 is dependent on the organization of the half-sites in the response element.

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Selected References

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