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J. Virol., 12 1995, 8001-8010, Vol 69, No. 12
Copyright © 1995, American Society for Microbiology

Inducible expression of the P, V, and NP genes of the paramyxovirus simian virus 5 in cell lines and an examination of NP-P and NP-V interactions

B Precious, DF Young, A Bermingham, R Fearns, M Ryan and RE Randall
School of Biological and Medical Sciences, University of St. Andrews, Fife, Scotland.

The P, V, and NP genes of the paramyxovirus simian virus 5 (SV5) were cloned such that their expression was regulated by the tetracycline- controlled transactivator (M. Gossen and H. Bujard, Proc. Natl. Acad. Sci. USA 89:5547-5551, 1992), and mammalian cell lines that inducibly expressed individually the P, V, or NP protein or coexpressed the P plus NP or V plus NP proteins were isolated. A plasmid that expresses the tetracycline-controlled transactivator linked, via the foot-and- mouth disease virus 2A cleavage peptide sequence, to the neomycin aminoglycoside phosphotransferase gene was constructed. Cells were cotransfected with this plasmid, and the appropriate responder plasmids and clonies were selected on the basis of their resistance to Geneticin (via the neomycin aminoglycoside phosphotransferase gene). The properties of these cell lines, in terms of the induction of the P, V, and NP genes, are described in detail. Both the P and V proteins were phosphorylated when expressed alone. In immunoprecipitation studies using a monoclonal antibody that recognizes both the P and V proteins, a nonphosphorylated host cell protein with an estimated molecular weight of 150,000 was coprecipitated with V but not P. Immunofluorescence data demonstrated that when expressed separately, the P protein had a diffuse cytoplasmic distribution, but the related V protein had both a nuclear and cytoplasmic distribution. The NP protein had a granular cytoplasmic distribution, giving rise to punctate and granular fluorescence. Coexpression of the NP and P proteins resulted in the accumulation of large cytoplasmic inclusion aggregates, similar to those visualized at late times in SV5-infected cells. Coexpression of V with NP led to a partial redistribution of the NP protein in that the NP protein had both a diffuse cytoplasmic and nuclear distribution in the presence of V, but no NP-V aggregates or inclusion bodies were visualized. Direct binding studies also revealed that NP bound to both P and V. For SV5, these studies suggest that V may have a role in keeping NP soluble prior to encapsidation.


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