| Literature DB >> 8418839 |
J H Toney1, L Wu, A E Summerfield, G Sanyal, B M Forman, J Zhu, H H Samuels.
Abstract
A classic model of steroid/thyroid hormone receptor activation postulates that a conformational change or "transformation" occurs upon ligand binding as a first step toward regulation of gene transcription. In order to test this model, physical studies have been carried out using purified full-length chicken thyroid hormone receptor alpha 1 (cT3R-alpha 1) expressed in Escherichia coli. Circular dichroism spectroscopic studies reveal that cT3R-alpha 1 adopts a different conformation upon specific binding to a cognate ligand triiodothyroacetic acid as well as to a thyroid hormone response element, an idealized inverted repeat AGGTCA TGACCT. These results suggest that cT3R-alpha 1 may adopt distinct conformations whether free or bound to ligand or to DNA. These states may reflect the changes in the conformation of steroid/thyroid hormone receptors in the signal transduction pathway.Entities:
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Year: 1993 PMID： 8418839 DOI： 10.1021/bi00052a001
Source DB: PubMed Journal: Biochemistry ISSN： 0006-2960 Impact factor: 3.162