Identification of novel host factors responsible for the functional regulation of influenza virus ribonucleoprotein complexes

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The genome of influenza virus replicates in the nucleus. The replicated viral genome forms ribonucleoprotein (RNP) complexes. The progeny RNP complexes are exported to the cytoplasm and acculate in the microtubule-organizing center (MTOC) and then moves to the budding site beneath the cell surface along microtubules. However, the regulatory mechanism of replicational and post-replicational processes of the RNP are largely unknown. Here, we identified YB-1, which is a cellular RNA-binding protein, as a novel viral RNP binding protein. We found that YB-1 is a porter that leads viral RNP to MTOC. Further, we also examined enzymatic activities of viral polymerases purified from either high or low pathogenic strain using biochemical assays.