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Related Experiment Videos

Distinct cellular factors regulate the c-myb promoter through its E2F element.

M R Campanero1, M Armstrong, E Flemington

  • 1Harvard University and Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.

Molecular and Cellular Biology
|November 24, 1999
PubMed
Summary

The c-myb proto-oncogene promoter shows unique E2F regulation, involving a novel E2Fmyb-sp complex and SP-1 binding. This distinct protein interaction maintains c-myb expression early in the cell cycle.

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Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • Gene Expression

Background:

  • Most E2F-driven promoters activate transiently at the G(1)/S transition.
  • The c-myb proto-oncogene promoter, despite an E2F element, is induced early in G(1) and remains active.
  • E2F sites typically act as repressors in G(1) due to pRb association.

Purpose of the Study:

  • Investigate the differential regulation of the c-myb promoter's E2F element.
  • Determine if unique protein complexes bind to the c-myb E2F element.
  • Elucidate the role of these complexes in c-myb promoter activation and cell cycle progression.

Main Methods:

  • Gel shift analysis to identify protein-DNA interactions.
  • Antibody supershift assays to identify bound proteins (DP-1, E2F1-5, p107, pRb).

Related Experiment Videos

  • Methylation interference experiments to map DNA binding sites.
  • Functional studies in NIH 3T3 cells to assess promoter activity.

    • Main Results:

    • A unique complex, E2Fmyb-sp, was identified with the c-myb E2F element, distinct from complexes formed by other promoters.
    • Antibodies to known E2F factors and associated proteins did not affect E2Fmyb-sp formation.
    • Methylation interference revealed distinct but overlapping DNA contact residues for E2Fmyb-sp compared to standard E2F complexes.
    • SP-1 was found to bind the c-myb E2F element.
    • E2Fmyb-sp and/or SP-1 are essential for full c-myb promoter activation and sustained G(1) expression.

    Conclusions:

    • The c-myb E2F element is regulated by a unique protein complex (E2Fmyb-sp) and SP-1.
    • This distinct regulatory mechanism allows for early G(1) activation and sustained expression of the c-myb proto-oncogene.
    • E2F elements exhibit diverse regulatory strategies through differential protein binding.