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Related Experiment Videos

fos-jun Conspiracy: implications for the cell.

I M Verma1, L J Ransone, J Visvader

  • 1Molecular Biology and Virology Laboratory, Salk Institute, San Diego, California 92138.

Princess Takamatsu Symposia
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

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The fos and jun oncoproteins form a stable complex (AP-1) that binds DNA. The fos protein

Area of Science:

  • Molecular Biology
  • Oncogenesis
  • Transcription Factors

Background:

  • Nuclear oncoproteins fos and jun (AP-1) form heterodimeric complexes.
  • These complexes bind to the AP-1 site with high affinity.
  • The leucine zipper domain is essential for heterodimer formation.

Purpose of the Study:

  • To investigate the roles of the leucine zipper and basic regions in fos-jun complex formation and DNA binding.
  • To determine the contribution of fos and jun proteins to the stability and DNA binding affinity of the AP-1 complex.
  • To explore the potential of fos and jun mutants as dominant-negative regulators.

Main Methods:

  • Site-directed mutagenesis of the leucine zipper and basic regions of fos and jun.
  • Analysis of heterodimer formation and DNA binding affinity.

Related Experiment Videos

  • Assessment of dominant-negative effects of mutant proteins.

    • Main Results:

    • Mutations in the leucine zipper domain did not affect heterodimer formation.
    • Mutagenesis of the fos basic region or alterations in domain spacing significantly impacted DNA binding affinity.
    • Mutations in basic amino acids of fos prevented DNA binding, even with wild-type jun.
    • Fos protein demonstrated dominance in DNA binding despite lacking intrinsic binding ability.
    • Mutants in basic regions of fos and jun exhibited dominant-negative properties.

    Conclusions:

    • The basic region of fos plays a critical role in determining the DNA binding affinity of the AP-1 complex.
    • Fos protein is dominant in the DNA binding of jun-fos heterodimers.
    • Mutants in the basic regions of fos and jun can function as dominant-negative mutants to inhibit normal cellular functions.