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Characterization of polyoma virus T antigen
Summary
Researchers purified polyoma virus tumor (T) antigen using specific antibodies. They identified a 100-108 kDa protein as a major component in infected cells, which was temperature-sensitive in mutants.
Area of Science:
- Virology
- Molecular Biology
- Immunochemistry
Background:
- Polyoma virus tumor (T) antigen plays a crucial role in viral infection and cell transformation.
- Understanding the properties and modifications of T antigen is essential for studying viral pathogenesis.
Purpose of the Study:
- To purify and characterize the polyoma virus T antigen.
- To investigate the molecular weight, modifications, and behavior of T antigen in lytically infected and transformed cells.
Main Methods:
- Purification of T antigen using high-titer rat antiserum and Staphylococcus protein A antibody adsorbent technique.
- Analysis of protein components via sodium dodecyl sulfate/polyacrylamide gel electrophoresis (SDS-PAGE).
- Assessment of temperature sensitivity in ts A mutant-infected cells and pulse-chase experiments.
Main Results:
- A major protein component of 100,000-108,000 molecular weight was identified as T antigen in lytically infected mouse cells.
- This major component exhibited temperature sensitivity in cells infected with ts A mutants.
- Pulse-chase experiments indicated a slight decrease in electrophoretic mobility, suggesting post-translational modification of T antigen.
- Transformed cells contained less T antigen compared to lytically infected cells, but the antigen size remained similar.
Conclusions:
- The study successfully purified and identified the major polyoma virus T antigen.
- T antigen undergoes modification and its expression levels differ between lytic infection and transformation.
- The temperature-sensitive nature of T antigen in mutants provides insights into its function.