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Studies using cell-free RNA synthesis systems and reverse genetics have been contributing to understanding of the molecular mechanism of replication and transcription of the influenza virus genome, which is the most essential process through the virus life cycle. Recently, it is noted that this mechanism is also involved in host range determination of the virus. In the light of the fact that viruses resistant to previously developed anti-influenza virus drugs emerge, establishment of a rational screening strategy of drugs for novel molecular targets is highly required. Further to clarify the detailed function of viral factors involved in replication and transcription of the virus genome and to devise anti-viral methods, determination of the 3D structures of viral factors should give a breakthrough. In this review, we summarize the recent accumulating information on the 3D structures of viral factors and discuss their function based on their structures.

Function of Influenza virus RNA polymerase on the structural basis