Grenoble Alliance for Integrated Structural Cell Biology (GRAL)
ANR-17-EURE-0003
フランス
Grenoble Instruct-ERIC Center (ISBG)
ANR-10-INSB-0005-02
フランス
引用
ジャーナル: Nucleic Acids Res / 年: 2025 タイトル: Influenza a virus antiparallel helical nucleocapsid-like pseudo-atomic structure. 著者: Florian Chenavier / Eleftherios Zarkadas / Lily-Lorette Freslon / Alice J Stelfox / Guy Schoehn / Rob W H Ruigrok / Allison Ballandras-Colas / Thibaut Crépin / 要旨: Influenza A viruses are responsible for human seasonal epidemics and severe animal pandemics with a risk of zoonotic transmission to humans. The viral segmented RNA genome is encapsidated by ...Influenza A viruses are responsible for human seasonal epidemics and severe animal pandemics with a risk of zoonotic transmission to humans. The viral segmented RNA genome is encapsidated by nucleoproteins (NP) and attached to the heterotrimeric polymerase, forming the viral ribonucleoproteins (vRNPs). Flexible helical vRNPs are central for viral transcription and replication. In this study, we present an advanced biological tool, the antiparallel helical RNP-like complex, assembled from recombinant N-terminally truncated NP and short synthetic RNA. The 3.0 Å cryo-electron microscopy structure details for the first time the whole RNA pathway across NP as well as NP-NP interactions that drive the antiparallel helical assembly accommodating major and minor grooves. Our findings show that the surface of the protein can harbour several conformations of the RNA, confirming that the number of nucleobases that binds to NP is not fixed, but ranges probably between 20 and 24. Taking all together, our data provide details to further understand the genome encapsidation and explain the inherent flexibility of influenza A virus vRNPs.
詳細: 20 mM HEPES 150 mM NaCl 5 mM beta-mercaptoethanol 2 mM methyl-PEG8-NHS
凍結
凍結剤: ETHANE / チャンバー内湿度: 98 % / チャンバー内温度: 298 K / 装置: FEI VITROBOT MARK IV / 詳細: 5 seconds blot at force 0.
詳細
20 mM HEPES 150 mM NaCl 5 mM betamercaptoethanol Incubation overnight with 0.004 uM RNA. Prior freezing, the sample was incubated with 2 mM methyl PEG8 N hydroxysuccinimide ester reagent.