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Related Experiment Videos

Sequence requirements for high affinity retinoid X receptor-alpha homodimer binding

H Castelein1, A Janssen, P E Declercq

  • 1Laboratory for Clinical Chemistry, Faculty of Pharmaceutical Sciences, Catholic University of Leuven, Belgium.

Molecular and Cellular Endocrinology
|May 17, 1996
PubMed
Summary

Retinoid X receptor alpha (RXR alpha) homodimers bind DNA response elements beyond established configurations. This study reveals broader DNA binding specificities for RXR alpha, expanding understanding of its transcriptional regulation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Endocrinology

Background:

  • Retinoid X receptor alpha (RXR alpha) is a crucial nuclear receptor involved in gene regulation.
  • Understanding the specific DNA sequences (response elements) that RXR alpha binds is vital for deciphering its biological functions.
  • Established RXR response elements (RXREs) typically involve direct repeats (DR1) or palindromic sequences (PAL0) of specific hexamers.

Purpose of the Study:

  • To identify novel sequence requirements for high-affinity binding of RXR alpha homodimers.
  • To explore potential alternative DNA binding configurations for RXR alpha beyond known RXREs.
  • To characterize the optimal sequence features for DR1 RXREs.

Main Methods:

  • A selection protocol using random oligonucleotides was employed to isolate sequences bound by RXR alpha homodimers.

Related Experiment Videos

  • Reporter gene assays were used to assess the functional activity of selected elements in response to 9-cis retinoic acid.
  • Functional and mutational analyses were performed to determine sequence requirements for DR1 RXREs.

    • Main Results:

    • Selected sequences predominantly contained hexamers related to the consensus A/GGGTCA, often in DR1 and PAL0 configurations.
    • High-affinity binding was also observed for DR2, DR6, and three-hexamer configurations.
    • Optimal DR1 RXREs were defined, with specific preferences for upstream hexamer composition and interspacing base (G, A, or T, but not C).
    • The study identified that a C at the final position of a DR1 element significantly reduces binding affinity.

    Conclusions:

    • RXR alpha homodimers exhibit broader DNA binding specificities than previously recognized, including non-canonical RXREs.
    • The findings suggest a more diverse role for RXR alpha in transcriptional regulation.
    • Further research is needed to confirm the biological relevance of these alternative RXREs in natural gene contexts.