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J Virol. 1988 March; 62(3): 776-782

Expression of the M gene of vesicular stomatitis virus cloned in various vaccinia virus vectors.

Department of Microbiology, University of Virginia School of Medicine, Charlottesville 22908.

ABSTRACT

Initial attempts to clone the matrix (M) gene of vesicular stomatitis virus (VSV) in a vaccinia virus expression vector failed, apparently because the expressed M protein, and particularly a carboxy-terminus-distal two-thirds fragment, was lethal for the virus recombinant. Therefore, a transient eucaryotic expression system was used in which a cDNA clone of the VSV M protein mRNA was inserted into a region of plasmid pTF7 flanked by the promoter and terminator sequences for the T7 bacteriophage RNA polymerase. When CV-1 cells infected with recombinant vaccinia virus vTF1-6,2 expressing the T7 RNA polymerase were transfected with pTF7-M3, the cells produced considerable amounts of M protein reactive by Western blot (immunoblot) analysis with monoclonal antibodies directed to VSV M protein. Evidence for biological activity of the plasmid-expressed wild-type M protein was provided by marker rescue of the M gene temperature-sensitive mutant tsO23(III) at the restrictive temperature. Somewhat higher levels of M protein expression were obtained in CV-1 cells coinfected with a vaccinia virus-M gene recombinant under control of the T7 polymerase promoter along with T7 polymerase-expressing vaccinia virus vTF1-6,2.

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