Abstract
Mutants (PH2010, PH2011, PH2012) of Rous sarcoma virus which have a growth-inhibitory effect on chicken embryo fibroblasts were isolated from a temperature-sensitive mutant of the Schmidt-Ruppin strain of Rous sarcoma virus (tsNY68). The growth rate of fibroblasts infected with these viruses was about 50 to 60% of that of uninfected fibroblasts. A morphological difference between mutant-infected and uninfected fibroblasts was observed at logarithmic phase but not at stationary phase. Neither the protein p60src nor its associated protein kinase activity was significantly detected by an immunoprecipitation assay in the cells infected with these mutants. Analysis of the unintegrated DNA of the mutant PH2010 showed that a sequence of about 1.4 kilobase pairs at the src gene region is deleted. Further examination of the viral structural proteins in infected cells as well as in virions by immunoprecipitation and peptide mapping revealed that the molecular size of the Pr76 gag protein of the mutant RSV is smaller than that of the mutant tsNY68 because of partial deletion at the p19 gag gene. The peptide maps suggest that the deleted region of the altered p19 of the mutant is near the carboxy terminal of p19. The amount of Prgp92env synthesized in the mutant-infected cells was about fivefold more than that in tsNY68-infected cells.
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