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Related Experiment Videos

EAPP, a novel E2F binding protein that modulates E2F-dependent transcription.

Michael Novy1, Regina Pohn, Peter Andorfer

  • 1Max F. Perutz Laboratories, Department of Medical Biochemistry, University Departments at the Vienna Biocenter, Medical University of Vienna, A-1030 Vienna, Austria.

Molecular Biology of the Cell
|February 18, 2005
PubMed
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Researchers discovered E2F-associated phosphoprotein (EAPP), a novel protein that interacts with E2F transcription factors. EAPP stimulates cell proliferation and may contribute to cancer development.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • E2F transcription factors regulate cell proliferation and apoptosis, with dysregulated activity linked to human cancers.
  • Identifying novel proteins interacting with E2F is crucial for understanding cancer development.

Purpose of the Study:

  • To identify and characterize novel E2F-binding proteins.
  • To investigate the role of the identified protein in cell cycle regulation and transcription.

Main Methods:

  • Yeast two-hybrid screening to identify E2F-interacting proteins.
  • Western blotting and immunofluorescence for protein localization and expression analysis.
  • Reporter gene assays and RNA interference (RNAi) to assess functional impact on transcription and cell cycle.

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Main Results:

  • A novel E2F-binding protein, EAPP (e2F-associated phosphoprotein), was identified and characterized.
  • EAPP interacts with E2F-1, E2F-2, and E2F-3, is nuclear-localized, and its levels are elevated in transformed cells.
  • EAPP enhances E2F-1-mediated transcription, increases S-phase cells upon overexpression, and reduces S-phase fraction upon knockdown, while repressing the p14(ARF) promoter.

Conclusions:

  • EAPP modulates E2F-regulated transcription, promoting cell proliferation.
  • EAPP's role in stimulating proliferation suggests its involvement in cellular malignant transformation.