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Interactions between E6AP and E6 proteins from alpha and beta HPV types.

Miranda Thomas1, Vjekoslav Tomaić, David Pim

  • 1International Centre for Genetic Engineering and Biotechnology, Padriciano 99, Trieste 34149, Italy. miranda@icgeb.org

Virology
|December 5, 2012
PubMed
Summary
This summary is machine-generated.

This study reveals how cutaneous Human papillomaviruses (HPVs) interact with cellular ubiquitination pathways, identifying key E3 ubiquitin ligases. It highlights differences and similarities between cutaneous and mucosal HPV E6 protein interactions.

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Area of Science:

  • Virology
  • Molecular Biology
  • Oncology

Background:

  • High-risk mucosotropic Human papillomaviruses (HPVs), particularly HPV-16, cause cervical cancer.
  • The cellular targets of their E6 oncoproteins are well-studied.
  • Less is known about the cellular targets of cutaneous HPV E6 proteins.

Purpose of the Study:

  • To investigate the cellular targets of cutaneous HPV E6 proteins.
  • To identify E6-interacting proteins involved in ubiquitination pathways for cutaneous HPV types.
  • To compare interactions with cellular ubiquitin-protein ligases between mucosal and cutaneous HPV E6 proteins.

Main Methods:

  • Proteomic analysis of cells transfected with cutaneous HPV E6 proteins.
  • Identification of E6-interacting proteins within ubiquitination pathways.
  • Assessment of E6AP turnover and E6 steady-state levels.

Main Results:

  • Proteomic analysis identified E3 ubiquitin-protein ligases E6AP and UBR4/p600 as E6-interacting proteins for cutaneous HPVs.
  • E6AP contributes to E6 steady-state levels.
  • Certain cutaneous HPV E6 proteins enhance E6AP turnover, similar to high-risk mucosal HPV types.

Conclusions:

  • Cutaneous and high-risk mucosal HPV E6 proteins share common interactions with cellular ubiquitin-protein ligases.
  • Distinct differences exist in how these HPV E6 proteins engage with the ubiquitination machinery.
  • This research clarifies the molecular mechanisms of HPV E6 oncoproteins from different host tropisms.