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• W1551008080 abstract "We have studied protein synthesis in cultured cells infected with the six noncytopathic ( nc ) mutants of the Australia-Victoria strain (AV-WT) of Newcastle disease virus and their plaque-forming revertants. Virus-specific polypeptides accumulated at 30 to 63% of wild-type levels in nc mutant-infected cells and between 66 and 175% of wild-type levels in revertant-infected cells. An exception was the L polypeptide, which accumulated in nc mutant-infected cells at only 5 to 20% of the levels found in wild-type infection. The reduced accumulation of the L polypeptide did not appear to be due to increased degradation of that polypeptide. A new polypeptide (X) accumulated instead of polypeptide P in cells infected with mutants nc 4 or nc 16 and in virions released from them. Peptide mapping identified X as an altered form of P. A revertant of mutant nc 4 ( nc 4S1), which forms larger hemadsorbing spots, but still does not form plaques, accumulated P instead of the X polypeptide. Thus, a lesion in P can affect virus spread without affecting cytopathogenicity. Virions of mutant nc 7 and two naturally occurring avirulent strains of Newcastle disease virus (NJ LaSota and B1-Hitchner) contained polypeptides (F 7 and F A , respectively) related to, but migrating more rapidly than, F 0 in sodium dodecyl sulfate-polyacrylamide gels. As previously reported for avirulent strains, a brief treatment of nc 7 virions with trypsin converted F 7 to F and increased infectivity. Similarly, culturing nc 7-infected cells in the presence of trypsin facilitated fusion from within and viral spread from cell to cell. A plaque-forming revertant of nc 7 still accumulated F 7 in virions, indicating that the lesions responsible for the F 7 and noncytopathic phenotypes are genetically separable. The virulent parental strain, AV-WT, exhibited a mean embryo death time of 42 h. Both the larger-spot-forming revertant of nc 4 ( nc 4S1) and the small-plaque-forming revertant of nc 7 exhibited a decrease in mean embryo death time (increase in virulence) from 74 to 63 h. A second-step, plaque-forming revertant derived from nc 4S1 ( nc 4S1R1) exhibited a further decrease in mean embryo death time from 63 to 44 h. The results suggest that the F A -F 7 and X lesions affect the ability of virus to spread from cell to cell. In addition, these lesions appear to be genetically separable from those responsible for the noncytopathic phenotype. However, both types of lesions cause an extension of mean embryo death time and, thus, may be relevant to virulence in vivo." @default.
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• W1551008080 title "Relationships Among Virus Spread, Cytopathogenicity, and Virulence as Revealed by the Noncytopathic Mutants of Newcastle Disease Virus" @default.
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• W1551008080 doi "https://doi.org/10.1128/jvi.40.3.691-702.1981" @default.
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