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. 1979 Apr;30(1):177–189. doi: 10.1128/jvi.30.1.177-189.1979

Selective isolation of mutants of vesicular stomatitis virus defective in production of the viral glycoprotein.

H F Lodish, R A Weiss
PMCID: PMC353312  PMID: 225514

Abstract

We describe a procedure that enriches for temperature-sensitive (ts) mutants of vesicular stomatitis virus (VSV), Indiana serotype, which are conditionally defective in the biosynthesis of the viral glycoprotein. The selection procedure depends on the rescue of pseudotypes of known ts VSV mutants in complementation group V (corresponding to the viral G protein) by growth at 39.5 degrees C in cells preinfected with the avian retrovirus Rous-associated virus 1 (RAV-1). Seventeen nonleaky ts mutants were isolated from mutagenized stocks of VSV. Eight induced no synthesis of VSV proteins at the nonpermissive temperature and hence were not studied further. Four mutants belonged to complementation group V and resembled other ts (V) mutations in their thermolability, production at 39.5 degrees C of noninfectious particles specifically deficient in VSV G protein, synthesis at 39.5 degrees C of normal levels of viral RNA and protein, and ability to be rescued at 39.5 degrees C by preinfection of cells by avian retroviruses. Five new ts mutants were, unexpectedly, in complementation group IV, the putative structural gene for the viral nucleocapsid (N) protein. At 39.5 degrees C these mutants also induced formation of noninfectious particles relatively deficient in G protein, and production of infectious virus at 39.5 degrees C was also enhanced by preinfection with RAV-1, although not to the same extent as in the case of the group V mutants. We believe that the primary effect of the ts mutation is a reduced synthesis of the nucleocapsid and thus an inhibition of synthesis of all viral proteins; apparently, the accumulation of G protein at the surface is not sufficient to envelope all the viral nucleocapsids, or the mutation in the nucleocapsid prevents proper assembly of G into virions. The selection procedure, based on pseudotype formation with glycoproteins encoded by an unrelated virus, has potential use for the isolation of new glycoprotein mutants of diverse groups of enveloped viruses.

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Selected References

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