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Profilin regulates the activity of p42POP, a novel Myb-related transcription factor

Marcell Lederer1, Brigitte M Jockusch, Martin Rothkegel

  • 1Cell Biology, Zoological Institute, Technical University of Braunschweig, 38092 Braunschweig, Germany.

Journal of Cell Science
|December 24, 2004
PubMed

Insights

Profilins bind to the novel Myb-related transcription factor p42POP, regulating its gene activity. This interaction influences p42POP

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Profilins regulate actin dynamics and interact with nuclear proteins.
  • The functional significance of profilin-nuclear protein interactions remains largely unknown.

Purpose of the Study:

  • To identify novel profilin ligands.
  • To characterize the interaction between profilin and a new Myb-related transcription factor, p42POP.
  • To elucidate profilin's regulatory role in p42POP activity and gene regulation.

Main Methods:

  • Identification and characterization of p42POP, a novel Myb-related transcription factor.
  • Analysis of p42POP domain structure, including proline-rich regions for profilin binding.
  • Co-immunoprecipitation assays to detect p42POP-profilin complexes.
  • Cellular localization studies of p42POP and profilin.
  • Luciferase reporter assays to assess p42POP's transcriptional activity and profilin's regulatory effect.

Main Results:

  • p42POP is a novel Myb-related transcription factor with a unique domain combination and wide tissue expression.
  • Profilin binds to p42POP via a proline-rich cluster, forming cellular complexes.
  • Profilin binding significantly reduces p42POP's repressor activity in gene regulation.
  • p42POP influences the cellular localization of profilin, including targeting it to mitochondria.

Conclusions:

  • Profilin acts as a regulator of the Myb-related transcription factor p42POP.
  • The interaction between profilin and p42POP plays a role in modulating gene regulation.
  • p42POP is a new cellular target for profilin, impacting its localization and function.

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