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Related Experiment Videos

PKN binds and phosphorylates human papillomavirus E6 oncoprotein.

Q Gao1, A Kumar, S Srinivasan

  • 1Department of Radiation Oncology, New England Medical Center, Boston, Massachusetts 02111, USA.

The Journal of Biological Chemistry
|May 16, 2000
PubMed
Summary

High-risk human papillomaviruses (HPVs) oncoprotein E6 interacts with protein kinase PKN, a novel finding in HPV oncogenesis. This interaction is crucial for mammary epithelial cell immortalization, linking HPV to phosphorylation cascades.

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Area of Science:

  • Oncology
  • Virology
  • Molecular Biology

Background:

  • High-risk human papillomaviruses (HPVs) are linked to cervical and genital cancers.
  • Viral oncoproteins E6 and E7 are key in HPV-associated carcinomas.
  • HPV E6 protein's role in immortalizing mammary epithelial cells is a model for oncogenic transformation.

Purpose of the Study:

  • To identify novel interactions of HPV E6 protein.
  • To investigate the role of these interactions in cellular immortalization.
  • To explore the functional consequences of HPV E6-protein kinase PKN interaction.

Main Methods:

  • Yeast two-hybrid system to identify interacting proteins.
  • In vitro (wheat-germ lysate) and in vivo (293T cells) binding assays.

Related Experiment Videos

  • Analysis of E6 mutants for PKN binding and immortalization potential.
  • PKN phosphorylation assays on HPV E6.

    • Main Results:

    • A novel interaction between HPV16 E6 and protein kinase PKN was identified.
    • High-risk HPV E6 proteins, but not low-risk ones, bind to PKN.
    • PKN binding is associated with, but not sufficient for, mammary epithelial cell immortalization.
    • PKN directly phosphorylates HPV E6, indicating E6 is a phosphoprotein.

    Conclusions:

    • The interaction between HPV E6 and PKN represents a novel mechanism in HPV-driven oncogenesis.
    • PKN binding is a significant factor in E6-mediated immortalization of mammary epithelial cells.
    • This study reveals a new link between HPV oncogenesis and cellular phosphorylation signaling pathways.