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MEQ and V-IL8: cellular genes in disguise?

J L Liu1, S F Lin, L Xia

  • 1Department of Molecular Biology and Microbiology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106-4960, USA.

Acta Virologica
|March 4, 2000
PubMed

Insights

Marek's disease virus (MDV) encodes Meq protein, a viral oncoprotein that dimerizes with host transcription factors Jun and Fos. This study demonstrates Meq and Jun functionally complement each other, impacting viral oncogenesis and immune evasion.

Area of Science:

  • Virology
  • Molecular Biology
  • Oncology

Background:

  • Oncogenic viruses manipulate host cell growth and immune evasion.
  • Herpesviruses encode viral homologs of cellular genes to achieve this.
  • Marek's disease virus (MDV) utilizes such strategies, including the Meq protein.

Purpose of the Study:

  • To investigate the function of the MDV Meq protein, a homolog of proto-oncogenes Jun and Fos.
  • To explore the interaction and functional complementation between Meq and Jun.
  • To identify and characterize viral homologs of cellular immune-related genes in MDV.

Main Methods:

  • Co-localization studies in living cells to observe Meq and Jun interaction.
  • Transformation and transactivation assays to assess functional complementation.
  • Bioinformatic analysis and characterization of viral gene homologs.

Main Results:

  • Meq protein and Jun protein colocalize in living cells, confirming dimer formation.
  • Meq and Jun functionally complement each other in cis and trans.
  • A viral IL8 (v-IL8) chemokine homolog was identified in the MDV genome.

Conclusions:

  • The Meq/Jun heterodimer plays a significant role in MDV-mediated cellular transformation and transactivation.
  • Meq's interaction with Jun highlights a mechanism for subverting host cell pathways.
  • The discovery of v-IL8 suggests MDV employs chemokine homologs for immune evasion.

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