+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 6xm5 | ||||||
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タイトル | Structure of SARS-CoV-2 spike at pH 5.5, all RBDs down | ||||||
要素 | Spike glycoprotein | ||||||
キーワード | VIRAL PROTEIN / SARS-CoV-2 spike / COVID19 | ||||||
機能・相同性 | 機能・相同性情報 Maturation of spike protein / viral translation / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / suppression by virus of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / entry receptor-mediated virion attachment to host cell ...Maturation of spike protein / viral translation / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / suppression by virus of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / entry receptor-mediated virion attachment to host cell / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / membrane fusion / receptor-mediated endocytosis of virus by host cell / Attachment and Entry / positive regulation of viral entry into host cell / receptor-mediated virion attachment to host cell / receptor ligand activity / host cell surface receptor binding / symbiont-mediated suppression of host innate immune response / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / virion attachment to host cell / SARS-CoV-2 activates/modulates innate and adaptive immune responses / host cell plasma membrane / virion membrane / identical protein binding / membrane / plasma membrane 類似検索 - 分子機能 | ||||||
生物種 | Severe acute respiratory syndrome coronavirus 2 (ウイルス) | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.1 Å | ||||||
データ登録者 | Zhou, T. / Tsybovsky, Y. / Olia, A. / Kwong, P.D. | ||||||
引用 | ジャーナル: Cell Host Microbe / 年: 2020 タイトル: Cryo-EM Structures of SARS-CoV-2 Spike without and with ACE2 Reveal a pH-Dependent Switch to Mediate Endosomal Positioning of Receptor-Binding Domains. 著者: Tongqing Zhou / Yaroslav Tsybovsky / Jason Gorman / Micah Rapp / Gabriele Cerutti / Gwo-Yu Chuang / Phinikoula S Katsamba / Jared M Sampson / Arne Schön / Jude Bimela / Jeffrey C Boyington / ...著者: Tongqing Zhou / Yaroslav Tsybovsky / Jason Gorman / Micah Rapp / Gabriele Cerutti / Gwo-Yu Chuang / Phinikoula S Katsamba / Jared M Sampson / Arne Schön / Jude Bimela / Jeffrey C Boyington / Alexandra Nazzari / Adam S Olia / Wei Shi / Mallika Sastry / Tyler Stephens / Jonathan Stuckey / I-Ting Teng / Pengfei Wang / Shuishu Wang / Baoshan Zhang / Richard A Friesner / David D Ho / John R Mascola / Lawrence Shapiro / Peter D Kwong / 要旨: The SARS-CoV-2 spike employs mobile receptor-binding domains (RBDs) to engage the human ACE2 receptor and to facilitate virus entry, which can occur through low-pH-endosomal pathways. To understand ...The SARS-CoV-2 spike employs mobile receptor-binding domains (RBDs) to engage the human ACE2 receptor and to facilitate virus entry, which can occur through low-pH-endosomal pathways. To understand how ACE2 binding and low pH affect spike conformation, we determined cryo-electron microscopy structures-at serological and endosomal pH-delineating spike recognition of up to three ACE2 molecules. RBDs freely adopted "up" conformations required for ACE2 interaction, primarily through RBD movement combined with smaller alterations in neighboring domains. In the absence of ACE2, single-RBD-up conformations dominated at pH 5.5, resolving into a solitary all-down conformation at lower pH. Notably, a pH-dependent refolding region (residues 824-858) at the spike-interdomain interface displayed dramatic structural rearrangements and mediated RBD positioning through coordinated movements of the entire trimer apex. These structures provide a foundation for understanding prefusion-spike mechanics governing endosomal entry; we suggest that the low pH all-down conformation potentially facilitates immune evasion from RBD-up binding antibody. #1: ジャーナル: bioRxiv / 年: 2020 タイトル: Cryo-EM Structures Delineate a pH-Dependent Switch that Mediates Endosomal Positioning of SARS-CoV-2 Spike Receptor-Binding Domains. 要旨: The SARS-CoV-2 spike employs mobile receptor-binding domains (RBDs) to engage the ACE2 receptor and to facilitate virus entry. Antibodies can engage RBD but some, such as CR3022, fail to inhibit ...The SARS-CoV-2 spike employs mobile receptor-binding domains (RBDs) to engage the ACE2 receptor and to facilitate virus entry. Antibodies can engage RBD but some, such as CR3022, fail to inhibit entry despite nanomolar spike affinity. Here we show the SARS-CoV-2 spike to have low unfolding enthalpy at serological pH and up to 10-times more unfolding enthalpy at endosomal pH, where we observe significantly reduced CR3022 affinity. Cryo-EM structures -at serological and endosomal pH- delineated spike recognition of up to three ACE2 molecules, revealing RBD to freely adopt the 'up' conformation. In the absence of ACE2, single-RBD-up conformations dominated at pH 5.5, resolving into a locked all-down conformation at lower pH. Notably, a pH-dependent refolding region (residues 824-858) at the spike-interdomain interface displayed dramatic structural rearrangements and mediated RBD positioning and spike shedding of antibodies like CR3022. An endosomal mechanism involving spike-conformational change can thus facilitate immune evasion from RBD-'up'-recognizing antibody. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 6xm5.cif.gz | 576.1 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb6xm5.ent.gz | 475.3 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 6xm5.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 6xm5_validation.pdf.gz | 2 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 6xm5_full_validation.pdf.gz | 2 MB | 表示 | |
XML形式データ | 6xm5_validation.xml.gz | 99 KB | 表示 | |
CIF形式データ | 6xm5_validation.cif.gz | 150.4 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/xm/6xm5 ftp://data.pdbj.org/pub/pdb/validation_reports/xm/6xm5 | HTTPS FTP |
-関連構造データ
関連構造データ | 22256MC 6xluC 6xm0C 6xm3C 6xm4C 7jwyC 7kmbC 7kmsC 7kmzC 7knbC 7kneC 7knhC 7kniC C: 同じ文献を引用 (文献) M: このデータのモデリングに利用したマップデータ |
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類似構造データ |
-リンク
-集合体
登録構造単位 |
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-要素
#1: タンパク質 | 分子量: 140952.531 Da / 分子数: 3 / 変異: R682G, R683S, R685S, K986P, V987P / 由来タイプ: 組換発現 由来: (組換発現) Severe acute respiratory syndrome coronavirus 2 (ウイルス) 遺伝子: S, 2 / 細胞株 (発現宿主): Freestyle 293F / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P0DTC2 #2: 多糖 | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose #3: 糖 | ChemComp-NAG / 研究の焦点であるリガンドがあるか | N | |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 | 名称: SARS-CoV-2 Spike / タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 値: 0.423 MDa / 実験値: NO |
由来(天然) | 生物種: Severe acute respiratory syndrome coronavirus 2 (ウイルス) |
由来(組換発現) | 生物種: Homo sapiens (ヒト) / 細胞: Freestyle 293F |
緩衝液 | pH: 5.5 |
緩衝液成分 | 濃度: 0.1 M / 名称: Acetate |
試料 | 濃度: 0.5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドの材料: GOLD / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil R2/2 |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 277 K |
-電子顕微鏡撮影
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 105000 X / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1250 nm / Cs: 2.7 mm / C2レンズ絞り径: 100 µm |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 2.18 sec. / 電子線照射量: 40 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 実像数: 9816 |
電子光学装置 | エネルギーフィルター名称: GIF Bioquantum / エネルギーフィルタースリット幅: 20 eV |
画像スキャン | サンプリングサイズ: 5 µm / 横: 5760 / 縦: 4092 |
-解析
ソフトウェア | 名称: PHENIX / バージョン: 1.14_3260: / 分類: 精密化 | ||||||||||||||||||||||||||||||||||||||||
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EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 2113090 / 詳細: Automated picking | ||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.1 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 108053 / アルゴリズム: FOURIER SPACE / クラス平均像の数: 1 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: OTHER / 空間: REAL | ||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 6XM0 | ||||||||||||||||||||||||||||||||||||||||
精密化 | 立体化学のターゲット値: CDL v1.2 | ||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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