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Cellular proteins that are targets for transformation by DNA tumour viruses

K Buchkovich1, N Dyson, P Whyte

  • 1Cold Spring Harbor Laboratory, NY 11724.

Ciba Foundation Symposium
|January 1, 1990
PubMed

Insights

Adenovirus E1A protein targets cellular proteins like pRb to drive cell growth and transformation. Understanding these interactions reveals common mechanisms in viral-mediated cell cycle control and cancer development.

Area of Science:

  • Molecular Biology
  • Virology
  • Cell Biology

Background:

  • Small DNA tumor viruses encode proteins that manipulate host gene expression and cell growth.
  • Adenovirus E1A protein is crucial for transcriptional activation and cellular transformation.
  • E1A interacts with cellular proteins including retinoblastoma protein (pRb).

Purpose of the Study:

  • To investigate the role of different domains within the E1A protein in transcriptional activation and cellular transformation.
  • To identify cellular targets of E1A-mediated transformation.
  • To explore the function of the E1A-associated protein p60 and its interaction with cell cycle regulators.

Main Methods:

  • Mutational analysis of E1A protein domains.
  • Co-immunoprecipitation assays to study protein-protein interactions (E1A with pRb, p107, p300).
  • Investigation of the kinase activity of the p60/p34 complex and its regulation by E1A.

Main Results:

  • Specific domains of E1A are responsible for transcriptional activation and transformation.
  • Transformation is correlated with E1A binding sites for pRb, p107, and a 300 kDa protein.
  • E1A-associated protein p60 forms a cell cycle-regulated kinase complex with p34 (cdc2 homologue).

Conclusions:

  • Cellular proteins like pRb, p107, and p300 are likely targets for E1A-mediated transformation.
  • Inactivation of proliferation-inhibiting proteins may be a common viral transformation mechanism.
  • E1A's effect on the p60/p34 kinase complex could explain how adenovirus overcomes cell cycle control and induces transformation.

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