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BC-box protein domain-related mechanism for VHL protein degradation

Maria Elena Pozzebon1, Archana Varadaraj, Domenico Mattoscio

  • 1Department of Experimental Oncology, European Institute of Oncology, 20139 Milan, Italy.

Proceedings of the National Academy of Sciences of the United States of America
|October 23, 2013
PubMed

Insights

Viral protein Gam1 hijacks cellular machinery to degrade the tumor suppressor VHL (von Hippel-Lindau) protein. This process stabilizes hypoxia-inducible factor 1α, impacting gene expression.

Area of Science:

  • Molecular Biology
  • Virology
  • Cancer Research

Background:

  • The von Hippel-Lindau (VHL) protein acts as a substrate receptor for Cullin Ring Ligase (CRL) complexes, targeting hypoxia-inducible factor 1α (HIF-1α) for degradation.
  • Adenoviral protein Gam1 utilizes a BC-box domain to interact with host Elongin B/C, functioning as a viral substrate receptor.

Purpose of the Study:

  • To investigate the mechanism by which Gam1 induces VHL protein degradation.
  • To characterize the role of CRL complexes in VHL protein turnover.
  • To explore the impact of viral and cellular BC-box proteins on VHL stability.

Main Methods:

  • Expression of viral proteins (Gam1) and cellular proteins with BC-box domains.
  • Analysis of VHL protein degradation via proteasome.
  • Assessment of hypoxia-inducible factor 1α stabilization and downstream target induction.
  • Characterization of Cullin Ring Ligase (CRL) complex involvement.

Main Results:

  • Gam1 expression leads to VHL protein degradation, consequently stabilizing hypoxia-inducible factor 1α and inducing its targets.
  • A CRL-dependent mechanism drives VHL protein degradation through the proteasome.
  • Viral and cellular BC-box proteins, including those with Suppressor of Cytokine Signaling (SOCS) domains, induce VHL degradation.

Conclusions:

  • Viral proteins can hijack cellular pathways to regulate key host proteins like VHL.
  • The interaction of viral BC-box proteins with host CRLs offers a novel mechanism for controlling cellular processes.
  • Understanding these viral strategies provides insights into VHL regulation and potential therapeutic targets.

Keywords:
hypoxiaoncoviral proteinsubiquitylation

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