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基本情報
登録情報 | データベース: EMDB / ID: EMD-14179 | |||||||||
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タイトル | HeLa cell expressing NSP3, NSP4 and NSP6 of SARS-CoV-2 | |||||||||
![]() | EM tomography of HeLa cell expressing NSP3, NSP4 and NSP6 of SARS-CoV-2 | |||||||||
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生物種 | ![]() | |||||||||
手法 | 電子線トモグラフィー法 / ネガティブ染色法 | |||||||||
![]() | Polishchuk R | |||||||||
資金援助 | 1件
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![]() | ![]() タイトル: The role of NSP6 in the biogenesis of the SARS-CoV-2 replication organelle. 著者: Simona Ricciardi / Andrea Maria Guarino / Laura Giaquinto / Elena V Polishchuk / Michele Santoro / Giuseppe Di Tullio / Cathal Wilson / Francesco Panariello / Vinicius C Soares / Suelen S G ...著者: Simona Ricciardi / Andrea Maria Guarino / Laura Giaquinto / Elena V Polishchuk / Michele Santoro / Giuseppe Di Tullio / Cathal Wilson / Francesco Panariello / Vinicius C Soares / Suelen S G Dias / Julia C Santos / Thiago M L Souza / Giovanna Fusco / Maurizio Viscardi / Sergio Brandi / Patrícia T Bozza / Roman S Polishchuk / Rossella Venditti / Maria Antonietta De Matteis / ![]() ![]() 要旨: SARS-CoV-2, like other coronaviruses, builds a membrane-bound replication organelle to enable RNA replication. The SARS-CoV-2 replication organelle is composed of double-membrane vesicles (DMVs) that ...SARS-CoV-2, like other coronaviruses, builds a membrane-bound replication organelle to enable RNA replication. The SARS-CoV-2 replication organelle is composed of double-membrane vesicles (DMVs) that are tethered to the endoplasmic reticulum (ER) by thin membrane connectors, but the viral proteins and the host factors involved remain unknown. Here we identify the viral non-structural proteins (NSPs) that generate the SARS-CoV-2 replication organelle. NSP3 and NSP4 generate the DMVs, whereas NSP6, through oligomerization and an amphipathic helix, zippers ER membranes and establishes the connectors. The NSP6(ΔSGF) mutant, which arose independently in the Alpha, Beta, Gamma, Eta, Iota and Lambda variants of SARS-CoV-2, behaves as a gain-of-function mutant with a higher ER-zippering activity. We identified three main roles for NSP6: first, to act as a filter in communication between the replication organelle and the ER, by allowing lipid flow but restricting the access of ER luminal proteins to the DMVs; second, to position and organize DMV clusters; and third, to mediate contact with lipid droplets (LDs) through the LD-tethering complex DFCP1-RAB18. NSP6 thus acts as an organizer of DMV clusters and can provide a selective means of refurbishing them with LD-derived lipids. Notably, both properly formed NSP6 connectors and LDs are required for the replication of SARS-CoV-2. Our findings provide insight into the biological activity of NSP6 of SARS-CoV-2 and of other coronaviruses, and have the potential to fuel the search for broad antiviral agents. | |||||||||
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画像 | ![]() | 190.9 KB | ||
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文書・詳細版 | ![]() | 350 KB | 表示 | |
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-関連構造データ
電子顕微鏡画像生データ | ![]() Data size: 107.1 Data #1: reconstructed tomograms of HeLa cells co-expressing NSP3 and NSP4 of SARS-CoV-2 [reconstructed volumes] Data #2: tilt series of HeLa cells co-expressing NSP3 and NSP4 of SARS-CoV-2 [tilt series] Data #3: reconstructed tomograms of HeLa cells expressing NSP6 of SARS-CoV-2 [reconstructed volumes] Data #4: tilt series of HeLa cells expressing NSP6 of SARS-CoV-2 [tilt series] Data #5: reconstructed tomograms of HeLa cells co-expressing NSP3, NSP4 and NSP6 of SARS-CoV-2 [reconstructed volumes] Data #6: tilt series of HeLa cells co-expressing NSP3, NSP4 and NSP6 of SARS-CoV-2 [tilt series] Data #7: reconstructed tomograms of HeLa cells co-expressing NSP3, NSP4 and NSP6-deltaSGF of SARS-CoV-2 [reconstructed volumes] Data #8: tilt series of HeLa cells co-expressing NSP3, NSP4 and NSP6-deltaSGF of SARS-CoV-2 [tilt series] Data #9: reconstructed tomograms of Calu-3 cells infected with early lineage of SARS-CoV-2 [reconstructed volumes] Data #10: tilt series of Calu-3 cells infected with early lineage of SARS-CoV-2 [tilt series] Data #11: reconstructed tomograms of Calu-3 cells infected with gamma variant of SARS-CoV-2 [reconstructed volumes] Data #12: tilt series of Calu-3 cells infected with gamma variant of SARS-CoV-2 [tilt series]) |
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注釈 | EM tomography of HeLa cell expressing NSP3, NSP4 and NSP6 of SARS-CoV-2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 これらの図は立方格子座標系で作成されたものです | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 6.908 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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試料の構成要素
-全体 : Thick section of plastic embedded HeLa cells co-expressing SARS-C...
全体 | 名称: Thick section of plastic embedded HeLa cells co-expressing SARS-CoV-2 NSP3/4/6. |
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要素 |
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-超分子 #1: Thick section of plastic embedded HeLa cells co-expressing SARS-C...
超分子 | 名称: Thick section of plastic embedded HeLa cells co-expressing SARS-CoV-2 NSP3/4/6. タイプ: cell / ID: 1 / 親要素: 0 詳細: The tomogram shows double membrane vesicles connected to zippered ER domain. |
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由来(天然) | 生物種: ![]() |
-実験情報
-構造解析
手法 | ネガティブ染色法 |
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![]() | 電子線トモグラフィー法 |
試料の集合状態 | cell |
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試料調製
緩衝液 | pH: 7.2 |
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染色 | タイプ: POSITIVE / 材質: Uranyl Acetate, OsO4 |
糖包埋 | 材質: Epon |
詳細 | Epon embedded pellet from cultured HeLa cells |
切片作成 | ウルトラミクロトーム - 装置: Leica EM UC7 / ウルトラミクロトーム - 温度: 20 K / ウルトラミクロトーム - 最終 厚さ: 250 nm |
位置合わせマーカー | Manufacturer: Aurion / 直径: 10 nm |
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電子顕微鏡法
顕微鏡 | FEI TECNAI 12 |
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撮影 | フィルム・検出器のモデル: OTHER / 平均電子線量: 30.0 e/Å2 |
電子線 | 加速電圧: 120 kV / 電子線源: LAB6 |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 1.2 µm / 最小 デフォーカス(公称値): 1.0 µm |
試料ステージ | 試料ホルダーモデル: FISCHIONE 2550 |
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画像解析
詳細 | IMOD |
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最終 再構成 | 使用した粒子像数: 131 |