Orf virus (ORFV) ANK-1 protein mitochondrial localization is mediated by ankyrin repeat motifs

Virus Genes. 2014 Aug;49(1):68-79. doi: 10.1007/s11262-014-1069-5. Epub 2014 Apr 18.

Abstract

Orf virus (ORFV) strain D1701-V, a Parapoxvirus belonging to the family Poxviridae, became attractive as a novel virus vector system that we successfully used for the generation of recombinant vaccines. Therefore, the identification of viral genes involved in host tropisms or immune modulation is of great interest, as for instance the ORFV-encoded ankyrin-repeat (AR) containing proteins. The present study shows for the first time that the ANK-1 designated gene product of ORFV126 is targeted to mitochondria of ORFV-infected and in ANK-1 transiently expressing cells. Taking advantage of ANK-1 EGFP fusion proteins and confocal fluorescence microscopy mutational and deletion analyses indicated the importance of AR8 and AR9, which may contain a novel class of mitochondria-targeting sequence (MTS) in the central to C-terminal part of this AR-containing protein. The fluorescent findings were corroborated by cell fractionation and Western blotting experiments. The presented results open the avenue for more detailed investigations on cellular binding partners and the function of ANK-1 in viral replication or virulence.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Ankyrin Repeat
  • Ankyrins / analysis*
  • Ankyrins / genetics
  • Artificial Gene Fusion
  • Chlorocebus aethiops
  • DNA Mutational Analysis
  • Genes, Reporter
  • Green Fluorescent Proteins / analysis
  • Green Fluorescent Proteins / genetics
  • Microscopy, Confocal
  • Microscopy, Fluorescence
  • Mitochondria / chemistry*
  • Orf virus / physiology*
  • Protein Transport
  • Vero Cells
  • Viral Proteins / analysis*
  • Viral Proteins / genetics

Substances

  • Ankyrins
  • Viral Proteins
  • enhanced green fluorescent protein
  • Green Fluorescent Proteins