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The polyomavirus major capsid protein VP1 interacts with the nuclear matrix regulatory protein YY1
Z Palková1, H Spanielová, V Gottifredi
1Instituto Pasteur - Fondazione Cenci Bolognetti, Dipartimento di Biotecnologie Cellulari ed Ematologia, Sezione di Genetica Molecolare, Università di Roma La Sapienza, Viale Regina Elena 324, 00161, Rome, Italy.
Abstract:
Polyomavirus reaches the nucleus in a still encapsidated form, and the viral genome is readily found in association with the nuclear matrix. This association is thought to be essential for viral replication. In order to identify the protein(s) involved in the virus-nuclear matrix interaction, we focused on the possible roles exerted by the multifunctional cellular nuclear matrix protein Yin Yang 1 (YY1) and by the viral major capsid protein VP1. In the present work we report on the in vivo association between YY1 and VP1. Using the yeast two-hybrid system we demonstrate that the VP1 and YY1 proteins physically interact through the D-E region of VP1 and the activation domain of YY1.
Insights
Researchers investigated how polyomavirus interacts with the nuclear matrix, a key step for viral replication. They discovered a direct physical interaction between the viral major capsid protein (VP1) and the cellular nuclear matrix protein Yin Yang 1 (YY1).
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Polyomavirus DNA replication is linked to the nuclear matrix.
- The viral major capsid protein (VP1) and cellular nuclear matrix protein Yin Yang 1 (YY1) are potential interactors.
Purpose of the Study:
- To identify proteins involved in the polyomavirus-nuclear matrix interaction.
- To investigate the interaction between VP1 and YY1.
Main Methods:
- Yeast two-hybrid system to test protein-protein interactions.
- In vivo association studies.
Main Results:
- Demonstrated a physical interaction between VP1 and YY1 in vivo.
- Identified specific interaction domains: D-E region of VP1 and activation domain of YY1.
Conclusions:
- VP1 and YY1 physically interact, suggesting a role in viral nuclear matrix association.
- This interaction may be crucial for polyomavirus replication and nuclear matrix binding.