Abstract
Tubulin acts as a positive transcription factor for in vitro RNA synthesis by two different negative-strand viruses: Sendai virus, a paramyxovirus; vesicular stomatitis virus (VSV), a rhabdovirus. A monoclonal antibody directed against beta-tubulin completely inhibited not only mRNA synthesis and RNA replication catalyzed in vitro by extracts of cells infected with either virus but also mRNA synthesis by detergent-disrupted purified virions. The synthesis of both a leader-like RNA and the NP mRNA directed by detergent-disrupted purified Sendai virions was shown to be totally dependent on the addition of purified tubulin. The addition of purified tubulin, although not required, also stimulated mRNA synthesis directed by detergent-disrupted VSV virions 2- to 7-fold. Finally, there appears to be an association between tubulin and the L protein of VSV, since both monoclonal and polyclonal anti-tubulin antisera specifically immunoprecipitated not only tubulin but also the L protein of two different VSV serotypes from the soluble protein fraction of infected cells.
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