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Related Experiment Videos

HPV31 E7 facilitates replication by activating E2F2 transcription through its interaction with HDACs.

Michelle S Longworth1, Regina Wilson, Laimonis A Laimins

  • 1Department of Microbiology and Immunology, Feinberg School of Medicine, Northwestern University, 303 E. Chicago Avenue, Chicago, IL 60611, USA.

The EMBO Journal
|April 30, 2005
PubMed
Summary

Human papillomaviruses (HPVs) E7 protein binding to histone deacetylases (HDACs) activates E2F2 transcription, promoting HPV replication. This E7-HDAC interaction is key for viral replication and suggests E2F2 as an antiviral target.

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Area of Science:

  • Virology
  • Molecular Biology
  • Oncology

Background:

  • Human papillomaviruses (HPVs) E7 oncoproteins interact with cellular proteins like Rb family members and histone deacetylases (HDACs).
  • HDAC binding is crucial for maintaining viral episomes during the HPV productive life cycle, which is dependent on keratinocyte differentiation.

Purpose of the Study:

  • To investigate the effects of HPV E7 on E2F family members in differentiating keratinocytes.
  • To elucidate the mechanism by which E7 binding to HDACs influences viral replication and gene expression.

Main Methods:

  • Examined E7's effects on E2F family members in differentiating keratinocytes.
  • Utilized chromatin immunoprecipitation assays to assess HDAC binding to the E2F2 promoter.
  • Employed siRNA to reduce E2F2 levels and evaluate its impact on HPV replication and cell proliferation.

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Main Results:

  • HPV E7 specifically activates E2F2 transcription in suprabasal keratinocytes via HDAC binding.
  • E7 inhibits HDAC binding to the E2F2 promoter in differentiating cells, leading to increased E2F2 expression.
  • E2F2 expression is essential for HPV replication, but its reduction does not impede keratinocyte proliferation.

Conclusions:

  • The interaction between E7 and HDACs directly regulates HPV replication.
  • E2F2 is identified as a critical factor facilitating HPV replication.
  • E2F2 presents a potential therapeutic target for developing antiviral strategies against HPV infections.