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. 1981 Jan;37(1):248–255. doi: 10.1128/jvi.37.1.248-255.1981

Characterization of vesicular stomatitis virus mutants by partial proteolysis.

P S Metzel, M E Reichmann
PMCID: PMC171002  PMID: 6260980

Abstract

Structural proteins of temperature-sensitive (ts) mutants of vesicular stomatitis virus, Indiana serotype, were compared with those of wild-type and revertant virions by electrophoresis on polyacrylamide gels of partial digests with Staphylococcus aureus V8 protease. Mutants of complementation groups III (tsG31 and tsG33), II (tsG22), and IV (tsG41) differed from the wild-type virion in peptide profiles of their M, NS, and N proteins, respectively. The differences were only detectable over a narrow range of enzyme-substrate ratios and were due to peptides transiently generated during incomplete digestion. Proteins of revertants to tsG31, tsG22, and tsG41 exhibited the wild-type virion peptide pattern, indicating that reversion had restored their original conformation. However, in the case of tsG22, the NS peptide profile reverted to the wild-type phenotype only partially, suggesting that a silent mutation might have taken place during either the original chemical mutagenesis or the following repeated laboratory passages. The apparent alteration in protein conformation and its restoration upon reversion of the mutants indicated that the lesions of groups III and IV were located in the M and N proteins, respectively. Moreover, for the first time, the site of mutation of group II could be positively identified as the NS protein cistron.

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Selected References

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