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A novel approach to protein-protein interaction: complex formation between the p53 tumor suppressor and the HIV Tat
F Longo1, M A Marchetti, L Castagnoli
1Dipartimento di Biopatologia Umana Sezione di Biologia Cellulare Università di Roma La Sapienza, Rome, Italy.
Abstract:
By using a novel genetic approach, based on the properties of lambda cl repressor, we demonstrate that the HIV-1 Tat protein specifically interacts with the human p53 protein via the p53 O2 dimerization domain. By random and site-specific mutagenesis, we also identify the residues in Tat and O2 peptides which are involved in this interaction. Two alternative biological consequences are expected to result from Tat-p53 interaction: (i) Tat-O2 interaction inactivates p53 regulation function, thus producing cell transformation; (ii) Tat-O2 interaction favours the formation of p53 dimers, thus leading the cell towards apoptosis.
Insights
The human immunodeficiency virus type 1 (HIV-1) Tat protein interacts with the p53 protein, potentially affecting cell transformation or apoptosis. This interaction involves specific residues in both Tat and the p53 O2 dimerization domain.
Area of Science:
- Molecular Biology
- Virology
- Cancer Biology
Background:
- The human immunodeficiency virus type 1 (HIV-1) Tat protein is crucial for viral replication.
- The p53 protein is a key tumor suppressor involved in cell cycle regulation and apoptosis.
Purpose of the Study:
- To investigate the specific interaction between HIV-1 Tat and human p53.
- To identify the molecular domains and residues involved in the Tat-p53 interaction.
- To elucidate the potential biological consequences of this interaction.
Main Methods:
- A novel genetic approach utilizing the lambda cl repressor.
- Random and site-specific mutagenesis of Tat and p53 O2 peptides.
Main Results:
- Demonstrated specific interaction between HIV-1 Tat and human p53 via the p53 O2 dimerization domain.
- Identified key residues in both Tat and O2 peptides critical for this interaction.
- Proposed two potential outcomes: p53 inactivation leading to cell transformation or enhanced p53 dimerization promoting apoptosis.
Conclusions:
- The interaction between HIV-1 Tat and p53 has significant implications for viral pathogenesis and cancer development.
- Understanding this interaction may reveal new therapeutic targets for HIV-1 infection and associated malignancies.