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Related Experiment Videos

Dimerizing the estrogen receptor DNA binding domain enhances binding to estrogen response elements

M A Kuntz1, D J Shapiro

  • 1Department of Biochemistry, University of Illinois, Urbana, Illinois 61801, USA.

The Journal of Biological Chemistry
|November 5, 1997
PubMed
Summary

Estrogen receptor (ER) DNA binding domain (DBD) dimerization significantly enhances binding to estrogen response elements (EREs). This dimerization is crucial for recognizing imperfect EREs in natural genes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Endocrinology

Background:

  • The estrogen receptor (ER) plays a critical role in gene regulation.
  • ER binds to specific DNA sequences known as estrogen response elements (EREs).
  • The mechanism of ER binding to EREs, particularly in vivo, requires further elucidation.

Purpose of the Study:

  • To investigate the role of dimerization in the DNA binding of the estrogen receptor.
  • To determine how dimerization affects the binding affinity of the ER DNA binding domain (ER DBD) to both consensus and natural EREs.
  • To understand the significance of dimerization for recognizing imperfect hormone response elements.

Main Methods:

  • Utilized monoclonal antibodies to induce dimerization of the ER DBD.
  • Engineered a dimeric form of the ER DBD using a peptide linker.

Related Experiment Videos

  • Assessed DNA binding affinity using electrophoretic mobility shift assays (EMSAs).
  • Tested binding to both palindromic consensus EREs and imperfect natural EREs (pS2 ERE).

    • Main Results:

    • Dimerization of ER DBD increased binding to consensus EREs by 5-6 fold, primarily through complex stabilization.
    • Binding affinity decreased significantly with widely spaced ERE half-sites, indicating weak inter-DBD interaction.
    • Monomeric ER DBD showed undetectable binding to the imperfect pS2 ERE.
    • Dimerized ER DBD exhibited at least 25-fold greater affinity for the imperfect pS2 ERE compared to monomeric ER DBD.

    Conclusions:

    • Steroid receptor dimerization is a key mechanism for facilitating the recognition of naturally occurring, imperfect hormone response elements.
    • Dimerization enhances the stability and affinity of ER DBD binding to DNA.
    • These findings provide a rationale for in vivo ER homodimer binding to DNA response elements.