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Transcriptional control by myb oncogene product

S Ishii1, T Nomura, C Kanei-Ishii

  • 1Laboratory of Molecular Genetics, Tsukuba Life Science Center, Ibaraki, Japan.

The Tohoku Journal of Experimental Medicine
|October 1, 1992
PubMed

Insights

Disrupting the leucine zipper in c-Myb

Area of Science:

  • Molecular Biology
  • Protein Structure and Function
  • Oncogenesis

Background:

  • The c-Myb protein is a transcription factor involved in cell proliferation and differentiation.
  • Dysregulation of c-Myb is implicated in various cancers.
  • Understanding the structural and functional domains of c-Myb is crucial for deciphering its role in oncogenesis.

Purpose of the Study:

  • To analyze the structure and function of two key domains of the c-Myb protein.
  • To investigate the role of the leucine zipper in the negative regulatory domain of c-Myb.
  • To elucidate the structural model of the Myb DNA-binding domain.

Main Methods:

  • Biochemical analysis of protein domains.
  • Site-directed mutagenesis to disrupt the leucine zipper structure.
  • Nuclear Magnetic Resonance (NMR) spectroscopy to analyze the DNA-binding domain structure.

Main Results:

  • Disruption of the leucine zipper significantly enhanced the transactivating and transforming capacities of c-Myb.
  • Evidence suggests an inhibitor binds c-Myb via the leucine zipper, suppressing transactivation.
  • A "tryptophan cluster" model for the Myb DNA-binding domain was proposed, with NMR confirming the role of conserved tryptophans in the hydrophobic core.
  • Oncogenic activation of c-Myb by missense mutation is suggested.

Conclusions:

  • The leucine zipper is a critical component of the negative regulatory domain of c-Myb.
  • Modulation of the leucine zipper interaction offers a potential therapeutic strategy for c-Myb-driven cancers.
  • The "tryptophan cluster" model provides new insights into the structural integrity and function of the Myb DNA-binding domain.

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