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Related Experiment Videos

Functional interaction between Oct-1 and retinoid X receptor.

T Kakizawa1, T Miyamoto, K Ichikawa

  • 1Department of Geriatrics, Endocrinology, and Metabolism, Shinshu University School of Medicine, Matsumoto 390-8621, Japan.

The Journal of Biological Chemistry
|June 26, 1999
PubMed
Summary

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Octamer-binding transcription factor-1 (Oct-1) interacts with retinoid X receptor (RXR), a nuclear receptor. Oct-1 negatively regulates gene transcription by reducing RXR heterodimer DNA binding and nuclear receptor signaling.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Nuclear Receptor Signaling

Background:

  • Retinoid X Receptor (RXR) is a nuclear receptor superfamily member involved in ligand-dependent gene transcription.
  • RXR heterodimerizes with various nuclear receptors, including thyroid hormone receptor (TR).
  • The precise mechanisms of RXR's regulatory interactions are under investigation.

Purpose of the Study:

  • To identify novel interaction partners of RXR.
  • To elucidate the functional consequences of RXR's interaction with Octamer-binding transcription factor-1 (Oct-1).
  • To investigate Oct-1's role in regulating nuclear receptor-mediated gene transcription.

Main Methods:

  • In vitro pull-down assays using RXR deletion mutants to map interaction domains.

Related Experiment Videos

  • Gel shift analysis to assess the impact of Oct-1 on TR/RXR heterodimer DNA binding.
  • Transient transfection assays in COS1 cells to evaluate transcriptional activity.

    • Main Results:

    • Octamer-binding transcription factor-1 (Oct-1) was identified as a novel interaction factor of Retinoid X Receptor (RXR).
    • Oct-1 binds to the DNA binding and hinge domains of RXR and the POU homeodomain of Oct-1.
    • Oct-1 significantly repressed TR/RXR heterodimer binding to the thyroid hormone response element (TRE) and T3-dependent transcriptional activity.

    Conclusions:

    • Oct-1 functionally interacts with RXR, modulating its DNA-binding capacity.
    • Oct-1 negatively regulates nuclear receptor signaling pathways by interfering with receptor-DNA complex formation.
    • These findings reveal a novel regulatory mechanism involving Oct-1 in the control of nuclear receptor activity.