title: Expression of the three influenza virus polymerase proteins in a single cell allows growth complementation of viral mutants.
abstract: Transformed cell lines derived from murine C127 cells were constructed that express the influenza virus RNA-dependent RNA polymerase proteins (PA, PB1, and PB2). Cell lines that express only one or all three of the proteins were tested for their ability to complement temperature-sensitive viral mutants incubated at the nonpermissive temperature. Two cell lines were isolated that express all three polymerase genes and complement the growth of PB2 temperature-sensitive mutants at the nonpermissive temperature. One of these lines also complemented PA temperature-sensitive mutants. The viral titers obtained in these two cell lines were 12-fold to 1000-fold higher than the viral titers obtained upon growth of the corresponding temperature-sensitive mutant in C127 cells at the nonpermissive temperature.
mesh_terms: D000818:Animals; D052688:Bovine papillomavirus 1 / Q000235:genetics; D002460:Cell Line; D003001:Cloning, Molecular; D005814:Genes, Viral; D005816:Genetic Complementation Test; D005822:Genetic Vectors; D051379:Mice; D009154:Mutation; D009975:Orthomyxoviridae / Q000201:enzymology / Q000235:genetics*; D012316:RNA Nucleotidyltransferases / Q000235:genetics*; D012367:RNA, Viral / Q000235:genetics; D012324:RNA-Dependent RNA Polymerase / Q000235:genetics*; D014779:Virus Replication
chemical_list: D012367:RNA, Viral; D012316:RNA Nucleotidyltransferases; D012324:RNA-Dependent RNA Polymerase