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. 1987 Oct;61(10):3133–3142. doi: 10.1128/jvi.61.10.3133-3142.1987

Homotypic and heterotypic exclusion of vesicular stomatitis virus replication by high levels of recombinant polymerase protein L.

E Meier, G G Harmison, M Schubert
PMCID: PMC255890  PMID: 3041035

Abstract

The recombinant polymerase protein L of vesicular stomatitis virus (VSV) expressed in COS cells is able to transcribe and replicate the viral genome, resulting in complementation of temperature-sensitive polymerase mutants of VSV at the restrictive temperature (M. Schubert, G. G. Harmison, C. D. Richardson, and E. Meier, Proc. Natl. Acad. Sci. USA 82:7984-7988, 1985). Here we report that the efficiency of complementation is dependent on the level of L protein expression. Unexpectedly, only cells expressing low levels of recombinant L protein efficiently complemented tsL gene mutants, whereas cells with high levels of L protein did not. In fact, in all cells with high levels of L protein expression, which at 40 h posttransfection represented almost the total number of transfected cells, viral replication not only of the temperature-sensitive mutant but also of wild-type VSV was excluded. The inhibition of VSV appeared to occur at an early stage of the infectious cycle, and wild-type virus of the same serotype (Indiana) as the recombinant L protein as well as wild-type virus of a different serotype (New Jersey) was affected. Measles virus, on the other hand, was not arrested in cells with high levels of recombinant L protein, demonstrating that these cells were still capable of supporting a viral infection. The expression of high levels of only the amino-terminal half of the L protein from a recombinant mutant L gene that contains a small out-of-frame deletion in the middle of the L gene did not inhibit a VSV infection. Since the level of amplification for both L- and truncated L-encoding vectors is similar, we conclude that the arrest of VSV was caused by high levels of functional full-length L protein itself and not by high levels of vector-encoded L mRNA or other vector products or by side effects of vector amplification. These data strongly support the idea that the highly conserved gene order of nonsegmented negative-strand viruses and the sequential and attenuated mode of transcription are important regulatory elements which balance the intracellular concentration of viral proteins. They both assure that the L gene is the last and the least frequently transcribed gene, giving rise to low levels of L protein necessary for efficient replication.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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