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Polyomavirus large T antigen mutants affected in viral DNA replication
1Department of Biochemistry, Université de Sherbrooke, Sherbrooke, Quebec, J1H 5N4, Canada.
Virology
|February 7, 2001
Summary
Two polyomavirus large T antigen mutants were studied for their roles in viral DNA replication and cell immortalization. One mutant (dl-97) showed a dominant negative effect on replication, while the other (13val) was defective in both replication and immortalization.
Area of Science:
- Virology
- Molecular Biology
- Oncogenesis
Background:
- Polyomavirus large T antigen (LT) is crucial for viral replication and cellular transformation.
- Understanding LT mutants aids in dissecting viral DNA replication mechanisms and oncogenic potential.
Purpose of the Study:
- To characterize two novel polyomavirus large T antigen mutants.
- To investigate their distinct roles in viral DNA replication and cell immortalization.
Main Methods:
- Site-directed mutagenesis was used to generate LT mutants.
- Viral DNA replication assays were performed.
- Cell immortalization assays were conducted.
Main Results:
- The dl-97 mutant, active in immortalization, demonstrated a dominant negative effect on viral DNA replication.
- The 13val mutant exhibited defects in both immortalization and viral DNA replication.
- A lesion in the putative DnaJ domain of 13val was identified, impacting the inhibition of Retinoblastoma (Rb) protein function.
Conclusions:
- Different polyomavirus large T antigen mutations lead to distinct functional outcomes in viral DNA replication and cell immortalization.
- The DnaJ domain is critical for LT's ability to block Rb function, affecting both viral replication and immortalization.
- These findings provide insights into the structure-function relationships of polyomavirus LT.