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Related Experiment Videos

Bovine papillomavirus E7 transformation function correlates with cellular p600 protein binding.

Joseph DeMasi1, Kyung-Won Huh, Yoshihiro Nakatani

  • 1Department of Pathology, Brigham and Women's Hospital and Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 6, 2005
PubMed
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The bovine papillomavirus type 1 E7 oncoprotein binds to a protein called p600, which is crucial for viral transformation. This interaction with p600 is key for the E7 oncoprotein

Area of Science:

  • Oncology
  • Virology
  • Molecular Biology

Background:

  • The E7 oncoprotein of bovine papillomavirus type 1 (BPV-1) is essential for viral transformation, but its mechanism of action is unclear.
  • Understanding how E7 contributes to cellular transformation is critical for developing antiviral therapies.

Purpose of the Study:

  • To identify cellular proteins that interact with the BPV-1 E7 oncoprotein.
  • To elucidate the role of these interactions in viral transformation.

Main Methods:

  • Tandem affinity purification was employed to identify proteins complexed with BPV-1 E7.
  • The functional significance of the E7-p600 interaction was assessed using cell transformation assays and p600 knockdown experiments.

Main Results:

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  • The 600-kDa protein, p600, was identified as a binding partner of BPV-1 E7.
  • E7's ability to enhance anchorage independence correlated with its p600-binding capacity.
  • Mutant E7 proteins deficient in p600 binding exhibited defective transformation.
  • Knockdown of p600 reduced cellular transformation induced by BPV-1 E6 and E7, or E6 alone.
  • The interaction between E7 and p600 was conserved across different papillomaviruses, including HPV16.

Conclusions:

  • The study identifies p600 as a crucial cellular target of the BPV-1 E7 oncoprotein.
  • E7-mediated cellular transformation is, at least partially, dependent on its interaction with p600.
  • p600 represents a conserved target for the E7 proteins of multiple papillomaviruses, suggesting a common mechanism of oncogenesis.