ジャーナル: Nat Commun / 年: 2025 タイトル: Coupling of polymerase-nucleoprotein-RNA in an influenza virus mini ribonucleoprotein complex. 著者: Huiling Kang / Yunxiang Yang / Yixiao Liu / Mingyu Li / Lejin Zhang / Yuqi Lin / Leander Witte / Kuang-Yu Chen / Wenya Song / Zhili Xu / Xiaojing He / Luke W Guddat / Yu Guo / Liming Yan / ...著者: Huiling Kang / Yunxiang Yang / Yixiao Liu / Mingyu Li / Lejin Zhang / Yuqi Lin / Leander Witte / Kuang-Yu Chen / Wenya Song / Zhili Xu / Xiaojing He / Luke W Guddat / Yu Guo / Liming Yan / Yan Gao / Ervin Fodor / Zihe Rao / Zhiyong Lou / 要旨: Influenza virus ribonucleoprotein complexes (RNPs), composed of the polymerase complex (FluPol), nucleoprotein (NP), and RNA, are essential for replication and transcription. We report atomic- ...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.