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Related Experiment Videos

Active nuclear import and export pathways regulate E2F-5 subcellular localization.

Margarita D Apostolova1, Iordanka A Ivanova, Carla Dagnino

  • 1Department of Physiology, Child Health Research Institute and Lawson Health Research Institute, University of Western Ontario, London, Ontario N6A 5C1, Canada.

The Journal of Biological Chemistry
|June 29, 2002
PubMed
Summary

E2F-5 protein shuttles between the cytoplasm and nucleus during keratinocyte differentiation. Its nuclear import is mediated by specific domains, independent of other proteins, and export is CRM1-dependent.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Dermatology

Background:

  • Epidermal keratinocyte differentiation involves cell cycle exit.
  • E2F transcription factors regulate cell cycle progression.
  • E2F-5 and p130 complex formation is linked to cell cycle withdrawal in keratinocytes.

Purpose of the Study:

  • To investigate the regulation of E2F-5 subcellular localization during keratinocyte differentiation.
  • To identify the molecular determinants of E2F-5 nuclear import and export.

Main Methods:

  • In vitro nuclear import assays using digitonin-permeabilized cells.
  • Analysis of E2F-5 mutants for nuclear import and export.
  • Leptomycin B treatment to assess CRM1-mediated export.

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Main Results:

  • E2F-5 undergoes nucleocytoplasmic shuttling during keratinocyte differentiation.
  • Nuclear import of E2F-5 is mediated by its N-terminal 56 amino acids and does not require DP or pRB family proteins.
  • E2F-5 nuclear export is CRM1-dependent and involves amino acid residues 130-154.

Conclusions:

  • E2F-5 subcellular localization is tightly regulated during keratinocyte differentiation.
  • Specific functional domains within E2F-5 control its nucleocytoplasmic shuttling.
  • This regulation plays a role in the irreversible cell cycle exit of differentiating keratinocytes.