The University Grants Committee, Research Grants Council (RGC)
香港
引用
ジャーナル: Nature / 年: 2024 タイトル: Molecular architecture of coronavirus double-membrane vesicle pore complex. 著者: Yixin Huang / Tongyun Wang / Lijie Zhong / Wenxin Zhang / Yu Zhang / Xiulian Yu / Shuofeng Yuan / Tao Ni / 要旨: Coronaviruses remodel the intracellular host membranes during replication, forming double-membrane vesicles (DMVs) to accommodate viral RNA synthesis and modifications. SARS-CoV-2 non-structural ...Coronaviruses remodel the intracellular host membranes during replication, forming double-membrane vesicles (DMVs) to accommodate viral RNA synthesis and modifications. SARS-CoV-2 non-structural protein 3 (nsp3) and nsp4 are the minimal viral components required to induce DMV formation and to form a double-membrane-spanning pore, essential for the transport of newly synthesized viral RNAs. The mechanism of DMV pore complex formation remains unknown. Here we describe the molecular architecture of the SARS-CoV-2 nsp3-nsp4 pore complex, as resolved by cryogenic electron tomography and subtomogram averaging in isolated DMVs. The structures uncover an unexpected stoichiometry and topology of the nsp3-nsp4 pore complex comprising 12 copies each of nsp3 and nsp4, organized in 4 concentric stacking hexamer rings, mimicking a miniature nuclear pore complex. The transmembrane domains are interdigitated to create a high local curvature at the double-membrane junction, coupling double-membrane reorganization with pore formation. The ectodomains form extensive contacts in a pseudo-12-fold symmetry, belting the pore complex from the intermembrane space. A central positively charged ring of arginine residues coordinates the putative RNA translocation, essential for virus replication. Our work establishes a framework for understanding DMV pore formation and RNA translocation, providing a structural basis for the development of new antiviral strategies to combat coronavirus infection.
凍結剤: ETHANE / チャンバー内湿度: 95 % / チャンバー内温度: 277.15 K / 装置: FEI VITROBOT MARK IV
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電子顕微鏡法
顕微鏡
TFS KRIOS
撮影
フィルム・検出器のモデル: TFS FALCON 4i (4k x 4k) 平均電子線量: 3.0 e/Å2 詳細: The tilt-series were acquired using Thermofisher Krios equipped with a Falcon 4i camera and Selectris energy filter. A dose-symmetric scheme (group of 2) was used, with a tilt range of -51 to ...詳細: The tilt-series were acquired using Thermofisher Krios equipped with a Falcon 4i camera and Selectris energy filter. A dose-symmetric scheme (group of 2) was used, with a tilt range of -51 to 51 (or -60 to 60) at 3 increments and an exposure dose of 3 e-/A2 per image. The total dose was 105 or 123 e-/A2.