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Adaptive mutation PB2 D701N promotes nuclear import of influenza vRNPs in mammalian cells.

Eur. J. Cell Biol.2015 Jul-Sep ;94(7-9):368-74. Epub 2015 Jun 02
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摘要


The segmented genome of influenza viruses is translocated into the nucleus to initiate transcription and replication. The gene segments are present as viral ribonucleoprotein (vRNP) particles composed of RNA, multiple copies of the nucleoprotein (NP), and the polymerase subunits PB1, PB2 and PA. The PB2 subunit and each NP monomer contain a nuclear localisation signal (NLS) that binds to importin-α. To throw light on the role of the NLSs of NP and PB2 in nuclear transport, we have analysed the effect of mutation D701N, responsible for the exposure of the NLS domain of PB2, on the intracellular localisation of vRNPs. We show that exposure of PB2 NLS significantly enhances the amount of vRNPs present in the nucleus. These observations suggest that entry of vRNPs into the nucleus depends on controlled interplay of the NLSs of PB2 and NP with the nuclear import machinery.

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