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Mol Cell Biol. 1991 October; 11(10): 5005-5015

Differential DNA binding by monomeric, homodimeric, and potentially heteromeric forms of the thyroid hormone receptor.

M A Lazar, T J Berrodin and H P Harding

Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104.

ABSTRACT

Binding of the thyroid hormone receptor (TR) to thyroid hormone-responsive elements (TREs) is crucial for regulation of gene expression by thyroid hormone. The TR binds to each half-site of a palindromic TRE separately, as a monomer, or simultaneously, as a homodimer. In addition, the TR monomer interacts with a 42-kDa protein that may be responsible for an increase in the apparent size and stability of the TR-TRE complex after incubation with liver nuclear extract. The multiple DNA-binding forms of the TR contact the TRE differently but compete for binding in a dynamic equilibrium which is highly dependent on the relative concentrations of TR and nuclear protein. Thus, protein-protein interactions are likely to determine the context in which the TR binds to target genes and regulates the transcriptional response to thyroid hormone.


Mol Cell Biol. 1991 October; 11(10): 5005-5015




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