Recruitment of host translation initiation factor eIF4G by the Vaccinia Virus ssDNA-binding protein I3

Izabela Zaborowska, Kerstin Kellner, Michael Henry, Paula Meleady, Derek Walsh*

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Poxviruses are large double-stranded DNA viruses that replicate exclusively in the cytoplasm of infected cells within discrete compartments termed viral factories. Recent work has shown that the prototypical poxvirus, Vaccinia Virus (VacV) sequesters components of the eukaryotic translation initiation complex eIF4F within viral factories while also stimulating formation of eIF4F complexes. However, the forces that govern these events remain unknown. Here, we show that maximal eIF4F formation requires viral DNA replication and the formation of viral factories, suggesting that sequestration functions to promote eIF4F assembly, and identify the ssDNA-binding protein, I3 as a viral factor that interacts and co-localizes with the eIF4F scaffold protein, eIF4G. Although it did not adversely affect host or viral protein synthesis, I3 specifically mediated the binding of eIF4G to ssDNA. Combined, our findings offer an explanation for the specific pattern and temporal process of eIF4G redistribution and eIF4F complex assembly within VacV-infected cells.

Original languageEnglish (US)
Pages (from-to)11-22
Number of pages12
JournalVirology
Volume425
Issue number1
DOIs
StatePublished - Mar 30 2012

Keywords

  • EIF4F
  • EIF4G
  • I3
  • Poxvirus
  • Translation initiation

ASJC Scopus subject areas

  • Virology

Fingerprint Dive into the research topics of 'Recruitment of host translation initiation factor eIF4G by the Vaccinia Virus ssDNA-binding protein I3'. Together they form a unique fingerprint.

  • Cite this