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Related Experiment Videos

Physical interaction between the mitogen-responsive serum response factor and myogenic basic-helix-loop-helix

R Groisman1, H Masutani, M P Leibovitch

  • 1Laboratoire de Biologie des Tumeurs Humaines, CNRS URA 1156, Institut Gustave Roussy, 39 rue Camille Desmoulins, 94805 Villejuif, France.

The Journal of Biological Chemistry
|March 1, 1996
PubMed
Summary
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Muscle cell differentiation involves transcription factors MyoD and myogenin interacting with serum response factor (SRF). These interactions, particularly involving the basic-helix-loop-helix (bHLH) domain, modulate gene expression during muscle development.

Area of Science:

  • Molecular Biology
  • Cellular Differentiation
  • Transcription Factor Regulation

Background:

  • Muscle cell differentiation involves coordinated changes in gene expression, with muscle-specific genes activated and proliferation-associated genes repressed.
  • Key transcription factors like MyoD, myogenin (bHLH family), and serum response factor (SRF) play crucial roles in regulating these opposing gene expression programs.
  • The modulation of transcription factor activity through protein-protein interactions is a critical mechanism in cellular differentiation.

Purpose of the Study:

  • To investigate the hypothesis that the functions of SRF, MyoD, and myogenin are modulated by physical associations between these transcription factors.
  • To determine if myogenin and MyoD directly interact with SRF during muscle cell differentiation.
  • To elucidate the specific domains and conditions required for these protein interactions.

Related Experiment Videos

Main Methods:

  • In vitro glutathione S-transferase (GST) pull-down assays were used to analyze protein-protein interactions between SRF, myogenin, and MyoD.
  • Yeast triple-hybrid assays were employed to confirm interactions in a cellular context.
  • Analysis of various protein mutants identified the specific domains involved in the observed interactions.

Main Results:

  • Myogenin specifically binds to SRF in differentiating myoblasts, with the interaction requiring myogenin-E12 heterodimers.
  • Both MyoD and myogenin, via their basic-helix-loop-helix (bHLH) domains, physically interact with SRF.
  • The natural inhibitor of myogenic bHLH proteins, Id, did not bind to SRF.

Conclusions:

  • SRF forms physical complexes with myogenic bHLH transcription factors (MyoD and myogenin).
  • These interactions suggest a mechanism where SRF and myogenic bHLH proteins modulate each other's activity through heterotrimeric complex formation.
  • This complex formation likely plays a significant role in regulating gene expression during terminal muscle cell differentiation.