Abstract
Unusually for an RNA virus, influenza A viruses transcribe and replicate their genomes in the nuclei of infected cells. As a result the viral ribonucleoprotein complexes (RNPs), and their newly synthesised protein subunits, must interact with the host nuclear import machinery. In this review we discuss how the virus exploits nuclear import pathways to allow regulated and chaperoned assembly of RNPs in the nucleus, and describe how the import machinery itself can be a determinant of host tropism.
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