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Related Experiment Videos

Different dimerization activities of alpha and beta thyroid hormone receptor isoforms

D S Darling1, R L Carter, P M Yen

  • 1Department of Medicine, Brigham and Women's Hospital, Howard Hughes Medical Institute, Boston, Massachusetts.

The Journal of Biological Chemistry
|May 15, 1993
PubMed
Summary

Thyroid hormone receptors (TR) alpha and beta isoforms show distinct homodimerization behaviors. TR beta preferentially forms homodimers, suggesting functional differences influencing thyroid hormone responses.

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Area of Science:

  • Molecular Endocrinology
  • Genetics
  • Biochemistry

Background:

  • Thyroid hormone receptors (TR) are crucial ligand-dependent transcription factors encoded by two genes, producing multiple isoforms.
  • Despite structural similarities, functional distinctions between TR alpha and TR beta isoforms are suggested by evolutionary conservation.

Purpose of the Study:

  • To investigate potential functional differences between TR alpha and TR beta isoforms.
  • To compare the DNA-binding activities and dimerization properties of TR alpha and TR beta on specific gene regulatory elements.

Main Methods:

  • Localization of a TR-binding site within the rabbit beta-myosin heavy chain gene.
  • Comparative analysis of TR alpha and TR beta DNA-binding activities using TR-binding sites from chicken lysozyme and rat alpha-glycoprotein hormone genes.

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  • Assessment of homodimer and heterodimer formation with auxiliary proteins (TRAP) using expressed TR isoforms and a TR alpha fragment.

    • Main Results:

    • TR beta demonstrated a preferential ability to form beta/beta homodimers, while TR alpha formed alpha/alpha homodimers poorly.
    • Both TR alpha and TR beta readily formed heterodimers with TRAP, indicating no significant difference in heterodimerization capacity with this auxiliary protein.
    • A TR alpha fragment selectively inhibited TR beta/TRAP complexes, suggesting TR beta/TR alpha heterodimers form more readily than TR alpha/TR alpha homodimers.

    Conclusions:

    • TR beta exhibits a higher propensity for homodimerization compared to TR alpha on the examined binding sites.
    • The distinct homodimerization potentials of TR alpha and TR beta may account for functional differences in thyroid hormone signaling pathways.