The Hemagglutinin of Canine Distemper Virus Determines Tropism and Cytopathogenicity
AUTOR(ES)
von Messling, Veronika
FONTE
American Society for Microbiology
RESUMO
Canine distemper virus (CDV) and measles virus (MV) cause severe illnesses in their respective hosts. The viruses display a characteristic cytopathic effect by forming syncytia in susceptible cells. For CDV, the proficiency of syncytium formation varies among different strains and correlates with the degree of viral attenuation. In this study, we examined the determinants for the differential fusogenicity of the wild-type CDV isolate 5804Han89 (CDV5804), the small- and large-plaque-forming variants of the CDV vaccine strain Onderstepoort (CDVOS and CDVOL, respectively), and the MV vaccine strain Edmonston B (MVEdm). The cotransfection of different combinations of fusion (F) and hemagglutinin (H) genes in Vero cells indicated that the H protein is the main determinant of fusion efficiency. To verify the significance of this observation in the viral context, a reverse genetic system to generate recombinant CDVs was established. This system is based on a plasmid containing the full-length antigenomic sequence of CDVOS. The coding regions of the H proteins of all CDV strains and MVEdm were introduced into the CDV and MV genetic backgrounds, and recombinant viruses rCDV-H5804, rCDV-HOL, rCDV-HEdm, rMV-H5804, rMV-HOL, and rMV-HOS were recovered. Thus, the H proteins of the two morbilliviruses are interchangeable and fully functional in a heterologous complex. This is in contrast with the glycoproteins of other members of the family Paramyxoviridae, which do not function efficiently with heterologous partners. The fusogenicity, growth characteristics, and tropism of the recombinant viruses were examined and compared with those of the parental strains. All these characteristics were found to be predominantly mediated by the H protein regardless of the viral backbone used.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=114365Documentos Relacionados
- The hemagglutinin envelope protein of canine distemper virus (CDV) confers cell tropism as illustrated by CDV and measles virus complementation analysis.
- The Hemagglutinin-Neuraminidase Protein of Newcastle Disease Virus Determines Tropism and Virulence
- Vaccinia virus recombinants expressing either the measles virus fusion or hemagglutinin glycoprotein protect dogs against canine distemper virus challenge.
- Continuous-Flow Ultracentrifugation of Canine Distemper Virus and Infectious Canine Hepatitis Virus
- Genotypes of Canine Distemper Virus Determined by Analysis of the Hemagglutinin Genes of Recent Isolates from Dogs in Japan