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Inhibition of VSV genome RNA replication but not transcription by monoclonal antibodies specific for the viral P protein.

The growth of vesicular stomatitis virus requires two distinct RNA synthetic events: transcription of messenger RNA molecules and replication of the viral genome RNA. We report the use of a panel of monoclonal antibodies directed against the viral phosphoprotein P in an attempt to assess the role of this protein in RNA synthesis. Using extracts derived from virus-infected cells, we show that several anti-P monoclonal antibodies can have an inhibitory effect on genome RNA replication by binding to a soluble form of the P protein. We also show that the P protein to which one of these antibodies (6D11) is directed is not complexed with the N protein and that the amount of soluble P protein that binds to the 6D11 antibody in immunoprecipitation reactions can be increased by treating extracts with alkaline phosphatase. In addition, phosphatase treatment of infected cell extracts results in an increased level of genome RNA replication. These results suggest that a soluble subspecies of the P protein that functions in genome RNA replication exists in infected cells and that this species of the P protein is not required for transcription.