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- W2022853974 abstract "The steroid-thyroid hormone receptors bind to imperfect repeats of two or more half-sites. It is generally accepted that a T3 response element (TRE) half-site consists of a six-nucleotide core motif (5'-AGGT(C/A)A-3'). It is less widely appreciated that the nucleotides flanking this core motif also have a major influence on the affinity of T3 receptor (TR) for its response element. We analyzed TR-DNA interactions under conditions in which the affinity of receptor monomers for individual TRE half-sites of the rat GH (rGH) gene was measured. These studies avoided the effects of half-site spacing and orientation on receptor binding. Variations in the nucleotides flanking the core sequence can modulate receptor binding by more than 15-fold. Systematic mutational analysis of TRE half-site structure demonstrated that at least two nucleotides flanking either side of the half-site core motif strongly influence TR binding affinity and activity, indicating that half-sites are approximately 10 nucleotides long. Thus, the half-sites of most TREs overlap, and mutations in one half-site may affect the activity of its partner. The TRE half-site sequence 5'-CTGAGGTAACG-3' was bound with highest affinity by TRs. The negatively T3-responsive promoter of the rGH gene was used to investigate the functional significance of the nucleotides flanking the core motif in vivo. A promoter consisting of only 22 rGH nucleotides, containing two functional TRE half-sites which overlap the rGH TATA box, directed T3-inhibited transcription. Mutation of nucleotides flanking the core sequence of the weaker half-site dramatically reduced the activity of the element, demonstrating that the flanking sequences of the half-sites can profoundly affect TRE activity." @default.
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- W2022853974 date "1992-09-01" @default.
- W2022853974 modified "2023-10-17" @default.
- W2022853974 title "Positive and negative thyroid hormone response elements are composed of strong and weak half-sites 10 nucleotides in length." @default.
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- W2022853974 doi "https://doi.org/10.1210/mend.6.9.1435790" @default.
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