Adaptation of canine distemper virus to canine footpad keratinocytes modifies polymerase activity and fusogenicity through amino acid substitutions in the P/V/C and H proteins.

Autor: Rivals JP; Institut de Biotechnologie, Bâtiment de Biologie, University of Lausanne, CH-1015 Lausanne, Switzerland., Plattet P, Currat-Zweifel C, Zurbriggen A, Wittek R
Jazyk: angličtina
Zdroj: Virology [Virology] 2007 Mar 01; Vol. 359 (1), pp. 6-18. Date of Electronic Publication: 2006 Oct 12.
DOI: 10.1016/j.virol.2006.07.054
Abstrakt: The wild-type canine distemper virus (CDV) strain A75/17 induces a non-cytocidal infection in cultures of canine footpad keratinocytes (CFKs) but produces very little progeny virus. After only three passages in CFKs, the virus produced 100-fold more progeny and induced a limited cytopathic effect. Sequence analysis of the CFK-adapted virus revealed only three amino acid differences, of which one was located in each the P/V/C, M and H proteins. In order to assess which amino acid changes were responsible for the increase of infectious virus production and altered phenotype of infection, we generated a series of recombinant viruses. Their analysis showed that the altered P/V/C proteins were responsible for the higher levels of virus progeny formation and that the amino acid change in the cytoplasmic tail of the H protein was the major determinant of cytopathogenicity.
Databáze: MEDLINE