Poxviral B1 Kinase Overcomes Barrier to Autointegration Factor, a Host Defense against Virus Replication

Matthew S. Wiebe, Paula Traktman

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Barrier to autointegration factor (BAF) is a DNA-binding protein found in the nucleus and cytoplasm of eukaryotic cells that functions to establish nuclear architecture during mitosis. Herein, we demonstrate a cytoplasmic role for BAF in host defense during poxviral infections. Vaccinia is the prototypic poxvirus, a family of DNA viruses that replicate exclusively in the cytoplasm of infected cells. Mutations in the vaccinia B1 kinase (B1) compromise viral DNA replication, but the mechanism by which B1 achieves this has remained elusive. We now show that BAF acts as a potent inhibitor of poxvirus replication unless its DNA-binding activity is blocked by B1-mediated phosphorylation. These data position BAF as the effector of an innate immune response that prevents replication of exogenous viral DNA in the cytoplasm. To enable the virus to evade this defense, the poxviral B1 has evolved to usurp a signaling pathway employed by the host cell.

Original languageEnglish (US)
Pages (from-to)187-197
Number of pages11
JournalCell Host and Microbe
Volume1
Issue number3
DOIs
StatePublished - May 17 2007

Fingerprint

Virus Replication
Poxviridae
Vaccinia
Cytoplasm
Phosphotransferases
Viral DNA
DNA Viruses
DNA-Binding Proteins
Eukaryotic Cells
DNA Replication
Mitosis
Innate Immunity
Phosphorylation
Viruses
Mutation
DNA
Infection

Keywords

  • DNA
  • MICROBIO

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Virology

Cite this

Poxviral B1 Kinase Overcomes Barrier to Autointegration Factor, a Host Defense against Virus Replication. / Wiebe, Matthew S.; Traktman, Paula.

In: Cell Host and Microbe, Vol. 1, No. 3, 17.05.2007, p. 187-197.

Research output: Contribution to journalArticle

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