ジャーナル: Nature / 年: 2020 タイトル: The native structure of the assembled matrix protein 1 of influenza A virus. 著者: Julia Peukes / Xiaoli Xiong / Simon Erlendsson / Kun Qu / William Wan / Leslie J Calder / Oliver Schraidt / Susann Kummer / Stefan M V Freund / Hans-Georg Kräusslich / John A G Briggs / 要旨: Influenza A virus causes millions of severe cases of disease during annual epidemics. The most abundant protein in influenza virions is matrix protein 1 (M1), which mediates virus assembly by ...Influenza A virus causes millions of severe cases of disease during annual epidemics. The most abundant protein in influenza virions is matrix protein 1 (M1), which mediates virus assembly by forming an endoskeleton beneath the virus membrane. The structure of full-length M1, and how it oligomerizes to mediate the assembly of virions, is unknown. Here we determine the complete structure of assembled M1 within intact virus particles, as well as the structure of M1 oligomers reconstituted in vitro. We find that the C-terminal domain of M1 is disordered in solution but can fold and bind in trans to the N-terminal domain of another M1 monomer, thus polymerizing M1 into linear strands that coat the interior surface of the membrane of the assembling virion. In the M1 polymer, five histidine residues-contributed by three different monomers of M1-form a cluster that can serve as the pH-sensitive disassembly switch after entry into a target cell. These structures therefore reveal mechanisms of influenza virus assembly and disassembly.
名称: Influenza A virus / タイプ: virus / ID: 1 / 親要素: 0 / 含まれる分子: #1 / NCBI-ID: 11320 / 生物種: Influenza A virus / Sci species strain: A/Hong Kong/1/1968 (H3N2) / ウイルスタイプ: VIRION / ウイルス・単離状態: OTHER / ウイルス・エンベロープ: Yes / ウイルス・中空状態: No
宿主
生物種: Homo sapiens (ヒト)
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超分子 #2: Matrix protein 1
超分子
名称: Matrix protein 1 / タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: #1 詳細: The M1 map was generated by subtomogram averaging of the M1 protein density in tomograms of influenza A virions.
由来(天然)
生物種: Influenza A virus (A型インフルエンザウイルス) 株: A/Hong Kong/1/1968 (H3N2)
トモグラム数: 5 / 使用した粒子像数: 100000 手法: Volumes picked semi-automatically along the particles membrane ソフトウェア: (名称: TOM, MATLAB, UCSF Chimera) 詳細: Initial positions were generated by simulating the surface of a cylindricated volume around the manually determined central axis of each particle. Initial positions have been 2X oversampled.
CTF補正
ソフトウェア: (名称: CTFFIND, NOVACTF) 詳細: CTF determination was performed using CTFFIND4. CTF correction was performed using 3D-CTF correction by CTF multiplication in NovaCTF.