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Related Experiment Videos

Interactions between SV40 T antigen and DNA polymerase alpha.

J V Gannon1, D P Lane

  • 1Imperial Cancer Research Fund, South Mimms, Potters Bar, Herts, UK.

The New Biologist
|January 1, 1990
PubMed
Summary

Simian virus 40 large T antigen (TAg) interaction with DNA polymerase alpha is crucial for viral DNA replication. Murine p53 protein inhibits this interaction, offering insights into cellular DNA synthesis regulation.

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Area of Science:

  • Molecular Biology
  • Virology
  • Cellular Biology

Background:

  • Simian virus 40 large T antigen (TAg) is essential for SV40 DNA replication.
  • Murine p53, a cellular anti-oncogene product, inhibits TAg's interaction with DNA polymerase alpha.
  • SV40 replication serves as a model for cellular DNA replication initiation.

Purpose of the Study:

  • To investigate the interaction between SV40 TAg, DNA polymerase alpha, and murine p53.
  • To quantify TAg-polymerase alpha and TAg-p53 complexes in infected and transformed cells.
  • To elucidate the functional significance of the TAg-polymerase alpha complex.

Main Methods:

  • Development of immunoassays using monoclonal antibodies against TAg, p53, and polymerase alpha.
  • Detection and quantification of protein complexes in lytically infected and transformed cells.
  • Analysis of TAg mutants (tsA58, 5080) for their binding affinities.

Main Results:

  • TAg-polymerase alpha and TAg-p53 complexes were detected in infected and transformed cells.
  • TAg-p53 complex levels were significantly lower in infected cells compared to transformed cells.
  • Antibodies inhibiting TAg-polymerase alpha binding also inhibited TAg-p53 binding.
  • TAg mutations (tsA58, 5080) that disrupt p53 binding also disrupt polymerase alpha binding.

Conclusions:

  • The TAg-polymerase alpha interaction is specific and functionally important for SV40 replication.
  • Murine p53 disrupts the TAg-polymerase alpha complex, providing a model for p53's role in regulating DNA synthesis.
  • Understanding these interactions sheds light on the regulation of cellular DNA replication.

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