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Functional antagonism between c-Jun and MyoD proteins: a direct physical association

E Bengal1, L Ransone, R Scharfmann

  • 1Molecular Biology and Virology Laboratory, Salk Institute, San Diego, California 92186-5800.

Cell
|February 7, 1992
PubMed

Insights

The proto-oncogene Jun protein inhibits muscle development by interfering with the MyoD protein. MyoD and Jun physically interact, impacting gene regulation in myogenesis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncogenes

Background:

  • The proto-oncogene Jun is a transcription factor involved in various cellular processes.
  • Myogenic Differentiation 1 (MyoD) is a key transcription factor regulating muscle development.
  • The interplay between Jun and MyoD in myogenesis is not fully understood.

Purpose of the Study:

  • To investigate the inhibitory role of Jun on myogenesis.
  • To elucidate the molecular mechanisms underlying the interaction between Jun and MyoD.
  • To determine how Jun affects MyoD function and gene expression.

Main Methods:

  • Transient transfection assays to assess promoter and enhancer activity.
  • Analysis of reporter gene expression linked to MyoD and AP-1 binding sites.
  • In vivo and in vitro co-immunoprecipitation to detect protein-protein interactions.
  • Mutational analysis of Jun and MyoD interaction domains.

Main Results:

  • Constitutive expression of Jun inhibits myogenesis by interfering with MyoD.
  • Jun suppresses the transactivation of MyoD-regulated promoters and enhancers.
  • MyoD antagonizes Jun-mediated transactivation of AP-1 site-linked genes.
  • Physical interaction between MyoD and Jun proteins was confirmed both in vivo and in vitro.
  • The interaction involves Jun's leucine zipper domain and MyoD's helix-loop-helix region.

Conclusions:

  • The proto-oncogene Jun inhibits myogenesis through direct physical interaction with the MyoD protein.
  • This interaction modulates the transcriptional activity of both proteins, affecting muscle cell differentiation.
  • Understanding the Jun-MyoD interaction provides insights into the regulation of muscle development and potential oncogenic pathways.

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