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Highly pathogenic avian influenza (HPAI) viruses of the H5N1 subtype are enzootic in poultry populations in different parts of the world, and have caused numerous human infections in recent years, particularly in Egypt. However, no sustained human-to-human transmission of these viruses has yet been reported. We tested nine naturally occurring Egyptian H5N1 viruses (isolated in 2014-2015) in ferrets and found that three of them transmitted via respiratory droplets, causing a fatal infection in one of the exposed animals. All isolates were sensitive to neuraminidase inhibitors. However, these viruses were not transmitted via respiratory droplets in three additional transmission experiments in ferrets. Currently, we do not know if the efficiency of transmission is very low or if subtle differences in experimental parameters contributed to these inconsistent results. Nonetheless, our findings heighten concern regarding the pandemic potential of recent Egyptian H5N1 influenza viruses.
For nuclear export of proteins, the formation of a ternary export complex composed of the export substrate, a cellular export factor and Ran-GTP is crucial. CRM1 is a cellular export factor for proteins containing leucine-rich nuclear export signals (NESs). Although the NES sequence is crucial for nuclear export, its exact role in the formation of the ternary export complex is controversial. Here we demonstrate an interaction between human CRM1 (hCRM1) and influenza A virus NS2 protein, which contains an NES motif in its N-terminal region. Replacement of the hydrophobic amino acids in the NES motif did not abolish NS2's interaction with hCRM1. Using our recently established systems for the generation of influenza virus or virus-like particles from cloned cDNAs, we found that NS2 is essential for nuclear export of influenza virus ribonucleoprotein (RNP) complexes, and that alteration of the NS2-NES abrogated this event and influenza virus generation. These findings suggest that the NS2-NES is not crucial for the interaction of this protein with hCRM1, but is for the formation of the ternary export complex with Ran-GTP.
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