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2025-12-5 16:15:48


Kang, H., Yang, Y., Liu, Y. et al. Coupling of polymerase-nucleoprotein-RNA in an influenza virus mini ribonucleoprotein complex. Nat Commun 16, 9741 (2025)
submited by kickingbird at Nov, 5, 2025 23:52 PM from Nat Commun 16, 9741 (2025)

Influenza virus ribonucleoprotein complexes (RNPs), composed of the polymerase complex (FluPol), nucleoprotein (NP), and RNA, are essential for replication and transcription. We report atomic-resolution cryo-EM structures of mini-vRNPs in two states: FluPol located inside (State-In) or at the outer rim (State-Out) of the NP-RNA ring. In both states, the 5´ and 3´ termini of vRNA are bound to FluPol as previously reported. One NP (NP-0) contacts PA/PB1 of FluPol and binds the distal double-stranded vRNA promoter, with its D72-K90 loop inserting into the RNA fork; separated strands occupy NP-0 RNA-binding grooves. Grooves from other NPs form a continuous RNA-protective path, consistent with negative-strand RNA virus mechanisms. In State-In, interfaces for FluPol dimerization or Pol II interaction are blocked, but fully exposed in State-Out. These structures reveal detailed FluPol-NP-RNA coupling and suggest a conformational shift in RNPs during the viral life cycle.

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