Related Experiment Videos
Phenotypic analysis of bovine papillomavirus type 1 E2 repressor mutants
P F Lambert1, B C Monk, P M Howley
1Laboratory of Tumor Virus Biology, National Cancer Institute Bethesda, Maryland 20892.
Journal of Virology
|February 1, 1990
Summary
Bovine papillomavirus type 1 (BPV-1) mutants lacking the E2 transcriptional repressor (E2-TR) showed increased viral DNA and transformation potential. Disrupting both E2-TR and E8/E2 proteins altered viral replication and cell transformation.
Area of Science:
- Virology
- Molecular Biology
- Oncogenesis
Background:
- The bovine papillomavirus type 1 (BPV-1) E2 open reading frame encodes key regulatory proteins.
- Understanding the distinct roles of these proteins is crucial for viral replication and pathogenesis.
Purpose of the Study:
- To investigate the functional significance of the E2 transcriptional repressor (E2-TR) and the E8/E2 fusion peptide in BPV-1 replication and transformation.
- To elucidate the phenotypes associated with mutations affecting these specific BPV-1 proteins.
Main Methods:
- Construction and analysis of BPV-1 mutants with disruptions in E2-TR and/or E8/E2 expression.
- Assessment of viral DNA plasmid copy number, transformation potential, and transactivation activity.
Main Results:
- Disruption of E8/E2 expression had minimal impact on viral processes.
- Loss of E2-TR resulted in a 10- to 20-fold increase in viral DNA copy number and enhanced transformation.
- A double mutant (lacking both E8/E2 and E2-TR) exhibited high transactivation but reduced replication and delayed transformation.
Conclusions:
- E2-TR plays a critical role in regulating BPV-1 DNA replication and transformation potential.
- E8/E2 functions similarly to E2-TR, but its absence has less pronounced effects.
- The interplay between E2-TR and E8/E2 influences BPV-1 oncogenic activity and replication dynamics.