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Functional and physical interaction of the human ARF tumor suppressor with Tat-binding protein-1

Alessandra Pollice1, Vittorio Nasti, Raffaele Ronca

  • 1Department of Genetics, General and Molecular Biology, University of Naples Federico II, Via Mezzocannone 8, 80134 Naples, Italy.

The Journal of Biological Chemistry
|December 11, 2003
PubMed

Insights

The human immunodeficiency virus Tat-binding protein-1 (TBP-1) interacts with the p14ARF tumor suppressor, increasing its levels and activity. This interaction highlights TBP-1's role in controlling cell proliferation and cancer.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The p14ARF tumor suppressor is crucial for regulating cell proliferation and is often inactivated in human cancers.
  • The precise mechanism of p14ARF's action and its regulatory pathways are not fully elucidated.
  • Human immunodeficiency virus Tat-binding protein-1 (TBP-1) is a proteasome component implicated in transcriptional regulation and cell proliferation control.

Purpose of the Study:

  • To investigate the interaction between p14ARF and TBP-1.
  • To determine the functional consequences of TBP-1 overexpression on p14ARF protein levels and activity.
  • To elucidate the role of TBP-1 in cellular proliferation control.

Main Methods:

  • Yeast and mammalian cell-based interaction assays to confirm TBP-1 and ARF binding.
  • Overexpression studies in various cell lines to assess the impact of TBP-1 on ARF protein levels.
  • Post-translational modification analysis to understand the mechanism of ARF regulation by TBP-1.
  • Assessment of p53 protein levels and activity following TBP-1 overexpression.

Main Results:

  • Specific interaction between TBP-1 and ARF was demonstrated in both yeast and mammalian cells.
  • Overexpression of TBP-1 led to a significant increase in both transfected and endogenous ARF protein levels.
  • The observed increase in ARF is dependent on the TBP-1/ARF binding and occurs, at least partly, at the post-translational level.
  • TBP-1 overexpression resulted in elevated p53 protein levels and enhanced p53 activity.
  • Data indicate a direct involvement of TBP-1 in the regulation of cell proliferation.

Conclusions:

  • TBP-1 directly interacts with and stabilizes the p14ARF tumor suppressor protein.
  • TBP-1 functions, at least in part, at the post-translational level to modulate ARF levels.
  • The TBP-1-mediated increase in ARF leads to enhanced p53 activity, suggesting a role in tumor suppression.
  • TBP-1 plays a significant role in the control of cellular proliferation, offering potential therapeutic targets in cancer.

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