Nucleotide resolution mapping of influenza A virus nucleoprotein-RNA interactions reveals RNA features required for replication

Nat Commun. 2018 Jan 31;9(1):465. doi: 10.1038/s41467-018-02886-w.

Abstract

Influenza A virus nucleoprotein (NP) association with viral RNA (vRNA) is essential for packaging, but the pattern of NP binding to vRNA is unclear. Here we applied photoactivatable ribonucleoside enhanced cross-linking and immunoprecipitation (PAR-CLIP) to assess the native-state of NP-vRNA interactions in infected human cells. NP binds short fragments of RNA (~12 nucleotides) non-uniformly and without apparent sequence specificity. Moreover, NP binding is reduced at specific locations within the viral genome, including regions previously identified as required for viral genome segment packaging. Synonymous mutations designed to alter the predicted RNA structures in these low-NP-binding regions impact genome packaging and result in virus attenuation, whereas control mutations or mutagenesis of NP-bound regions have no effect. Finally, we demonstrate that the sequence conservation of low-NP-binding regions is required in multiple genome segments for propagation of diverse mammalian and avian IAV in host cells.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Conserved Sequence
  • Dogs
  • Genome, Viral
  • HEK293 Cells
  • Humans
  • Influenza A Virus, H1N1 Subtype / genetics*
  • Influenza A Virus, H1N1 Subtype / metabolism
  • Madin Darby Canine Kidney Cells
  • Nucleotide Mapping
  • RNA, Viral / genetics*
  • RNA, Viral / metabolism
  • RNA-Binding Proteins / genetics*
  • RNA-Binding Proteins / metabolism
  • Viral Core Proteins / genetics*
  • Viral Core Proteins / metabolism
  • Virus Replication / genetics*

Substances

  • NP protein, Influenza A virus
  • RNA, Viral
  • RNA-Binding Proteins
  • Viral Core Proteins