A procedure to obtain RNA-free preparations containing the nucleoprotein (NP) and polymerase (P) proteins from influenza virus-infected cell extracts has been developed. The influenza virus P proteins present in these preparations copied small synthetic RNA molecules derived from plasmid sequences. In addition, RNA molecules encapsidated with the NP and P proteins were amplified and packaged into virus particles when transfected into influenza virus-infected cells. Thus, the preparations of NP and P proteins display features similar to those isolated from purified influenza virions, and represent an alternative for the preparation of active influenza virus P protein.


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