+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-3101 | |||||||||
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タイトル | Cryo-electron tomography and subtomogram averaging of Rous-Sarcoma-Virus deltaMBD virus-like particles | |||||||||
マップデータ | Subtomogram averaging reconstruction of immature RSV capsid from virus-like particles | |||||||||
試料 |
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キーワード | Retrovirus / Rous-Sarcoma virus / immature retrovirus / virus-like-particle / capsid | |||||||||
機能・相同性 | 機能・相同性情報 host cell nucleoplasm / viral procapsid maturation / host cell nucleolus / 加水分解酵素; プロテアーゼ; ペプチド結合加水分解酵素; アスパラギン酸プロテアーゼ / viral capsid / structural constituent of virion / nucleic acid binding / aspartic-type endopeptidase activity / viral translational frameshifting / host cell plasma membrane ...host cell nucleoplasm / viral procapsid maturation / host cell nucleolus / 加水分解酵素; プロテアーゼ; ペプチド結合加水分解酵素; アスパラギン酸プロテアーゼ / viral capsid / structural constituent of virion / nucleic acid binding / aspartic-type endopeptidase activity / viral translational frameshifting / host cell plasma membrane / proteolysis / zinc ion binding / membrane 類似検索 - 分子機能 | |||||||||
生物種 | Rous sarcoma virus (ラウス肉腫ウイルス) | |||||||||
手法 | サブトモグラム平均法 / クライオ電子顕微鏡法 / 解像度: 7.7 Å | |||||||||
データ登録者 | Schur FKM / Dick RA / Hagen WJH / Vogt VM / Briggs JAG | |||||||||
引用 | ジャーナル: J Virol / 年: 2015 タイトル: The Structure of Immature Virus-Like Rous Sarcoma Virus Gag Particles Reveals a Structural Role for the p10 Domain in Assembly. 著者: Florian K M Schur / Robert A Dick / Wim J H Hagen / Volker M Vogt / John A G Briggs / 要旨: The polyprotein Gag is the primary structural component of retroviruses. Gag consists of independently folded domains connected by flexible linkers. Interactions between the conserved capsid (CA) ...The polyprotein Gag is the primary structural component of retroviruses. Gag consists of independently folded domains connected by flexible linkers. Interactions between the conserved capsid (CA) domains of Gag mediate formation of hexameric protein lattices that drive assembly of immature virus particles. Proteolytic cleavage of Gag by the viral protease (PR) is required for maturation of retroviruses from an immature form into an infectious form. Within the assembled Gag lattices of HIV-1 and Mason-Pfizer monkey virus (M-PMV), the C-terminal domain of CA adopts similar quaternary arrangements, while the N-terminal domain of CA is packed in very different manners. Here, we have used cryo-electron tomography and subtomogram averaging to study in vitro-assembled, immature virus-like Rous sarcoma virus (RSV) Gag particles and have determined the structure of CA and the surrounding regions to a resolution of ∼8 Å. We found that the C-terminal domain of RSV CA is arranged similarly to HIV-1 and M-PMV, whereas the N-terminal domain of CA adopts a novel arrangement in which the upstream p10 domain folds back into the CA lattice. In this position the cleavage site between CA and p10 appears to be inaccessible to PR. Below CA, an extended density is consistent with the presence of a six-helix bundle formed by the spacer-peptide region. We have also assessed the affect of lattice assembly on proteolytic processing by exogenous PR. The cleavage between p10 and CA is indeed inhibited in the assembled lattice, a finding consistent with structural regulation of proteolytic maturation. IMPORTANCE: Retroviruses first assemble into immature virus particles, requiring interactions between Gag proteins that form a protein layer under the viral membrane. Subsequently, Gag is cleaved by ...IMPORTANCE: Retroviruses first assemble into immature virus particles, requiring interactions between Gag proteins that form a protein layer under the viral membrane. Subsequently, Gag is cleaved by the viral protease enzyme into separate domains, leading to rearrangement of the virus into its infectious form. It is important to understand how Gag is arranged within immature retroviruses, in order to understand how virus assembly occurs, and how maturation takes place. We used the techniques cryo-electron tomography and subtomogram averaging to obtain a detailed structural picture of the CA domains in immature assembled Rous sarcoma virus Gag particles. We found that part of Gag next to CA, called p10, folds back and interacts with CA when Gag assembles. This arrangement is different from that seen in HIV-1 and Mason-Pfizer monkey virus, illustrating further structural diversity of retroviral structures. The structure provides new information on how the virus assembles and undergoes maturation. | |||||||||
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 | EMマップ: SurfViewMolmilJmol/JSmol |
添付画像 |
-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_3101.map.gz | 6.2 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-3101-v30.xml emd-3101.xml | 12.2 KB 12.2 KB | 表示 表示 | EMDBヘッダ |
画像 | emd_3101.tif | 497.3 KB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-3101 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-3101 | HTTPS FTP |
-検証レポート
文書・要旨 | emd_3101_validation.pdf.gz | 254.3 KB | 表示 | EMDB検証レポート |
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文書・詳細版 | emd_3101_full_validation.pdf.gz | 253.4 KB | 表示 | |
XML形式データ | emd_3101_validation.xml.gz | 5.3 KB | 表示 | |
アーカイブディレクトリ | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-3101 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-3101 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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-マップ
ファイル | ダウンロード / ファイル: emd_3101.map.gz / 形式: CCP4 / 大きさ: 6.4 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Subtomogram averaging reconstruction of immature RSV capsid from virus-like particles | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 2.07 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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-添付データ
-試料の構成要素
-全体 : Immature-like Rous-Sarcoma Virus Gag particles
全体 | 名称: Immature-like Rous-Sarcoma Virus Gag particles |
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要素 |
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-超分子 #1000: Immature-like Rous-Sarcoma Virus Gag particles
超分子 | 名称: Immature-like Rous-Sarcoma Virus Gag particles / タイプ: sample / ID: 1000 / 集合状態: Homohexameric / Number unique components: 1 |
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-分子 #1: Rous-Sarcoma Virus deltaMBD Gag protein
分子 | 名称: Rous-Sarcoma Virus deltaMBD Gag protein / タイプ: protein_or_peptide / ID: 1 / Name.synonym: RSV dMBD / 集合状態: Hexamer / 組換発現: Yes |
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由来(天然) | 生物種: Rous sarcoma virus (ラウス肉腫ウイルス) / 別称: RSV |
分子量 | 理論値: 52 KDa |
組換発現 | 生物種: Escherichia coli BL21 (大腸菌) |
配列 | UniProtKB: Gag polyprotein |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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解析 | サブトモグラム平均法 |
試料の集合状態 | particle |
-試料調製
濃度 | 5 mg/mL |
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緩衝液 | pH: 6.5 / 詳細: MES pH6.5, 100mM NaCl,2uM ZnCl2 2mM TCEP |
グリッド | 詳細: C-Flat 2/2-#c grids, glow discharged for 30 sec in 20mA |
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 100 % / 装置: FEI VITROBOT MARK II 手法: Degassed C-Flat 2/2-3C grids were glow discharged for 30 seconds at 20 mA. Virus solution was diluted in PBS containing 10nm colloidal gold. 2.5 ul of this mixture was applied to a grid. Blotting time: 2 seconds |
-電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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特殊光学系 | エネルギーフィルター - 名称: GATAN GIF 2002 エネルギーフィルター - エネルギー下限: 0.0 eV エネルギーフィルター - エネルギー上限: 20.0 eV |
日付 | 2014年9月10日 |
撮影 | カテゴリ: CCD / フィルム・検出器のモデル: GATAN MULTISCAN / 平均電子線量: 34 e/Å2 / 詳細: Tilt series consisted of 21 or 31 micrographs. |
電子線 | 加速電圧: 200 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2.7 mm / 最大 デフォーカス(公称値): 5.0 µm / 最小 デフォーカス(公称値): 1.5 µm / 倍率(公称値): 81000 |
試料ステージ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER Tilt series - Axis1 - Min angle: -45 ° / Tilt series - Axis1 - Max angle: 45 ° |
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |
-画像解析
詳細 | Reconstruction carried out using subtomogram averaging. Subtomogram averaging was performed using scripts from the TOM (Nickell et al, 2005), AV3 (Foerster et al, 2005) and Dynamo (Castano-Diez, 2012) packages. Subtomograms were extracted from the surface of the virus-like parcticles with the radius corresponding to the radius of the particles. |
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最終 再構成 | 想定した対称性 - 点群: C6 (6回回転対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 7.7 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: IMOD, AV3, TOM, Dynamo 詳細: Reconstruction carried out using subtomogram averaging. Subtomogram averaging was performed using scripts from the TOM (Nickell et al, 2005), AV3 (Foerster et al, 2005) and Dynamo (Castano- ...詳細: Reconstruction carried out using subtomogram averaging. Subtomogram averaging was performed using scripts from the TOM (Nickell et al, 2005), AV3 (Foerster et al, 2005) and Dynamo (Castano-Diez, 2012) packages. Subtomograms were extracted from the surface of the virus-like parcticles with the radius corresponding to the radius of the particles. 使用したサブトモグラム数: 8375 |
CTF補正 | 詳細: Phase flipping of individual tilts |
最終 3次元分類 | クラス数: 1 |
-原子モデル構築 1
初期モデル | PDB ID: |
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ソフトウェア | 名称: Chimera, VMD, MDFF |
詳細 | Structures for p10 and CA-NTD (PDB 1P7N) and CA-CTD (PDB 3G1I, one monomer) were rigid body docked into the EM-density using the "Fit in map" option in chimera. Redundant residues of the antiparallel dimer of PDB 1P7N were removed. Missing residues in the helix7/helix8 linker region of CA, the connection loop between p10 and CA-NTD and residues upstream of the helix in p10 were manually modelled in Coot. The fit was further refined using Molecular Dynamics Flexible Fitting. |
精密化 | 空間: REAL / プロトコル: FLEXIBLE FIT |
得られたモデル | PDB-5a9e: |
-原子モデル構築 2
初期モデル | PDB ID: |
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ソフトウェア | 名称: Chimera, VMD, MDFF |
詳細 | Structures for p10 and CA-NTD (PDB 1P7N) and CA-CTD (PDB 3G1I, one monomer) were rigid body docked into the EM-density using the "Fit in map" option in chimera. Redundant residues of the antiparallel dimer of PDB 1P7N were removed. Missing residues in the helix7/helix8 linker region of CA, the connection loop between p10 and CA-NTD and residues upstream of the helix in p10 were manually modelled in Coot. The fit was further refined using Molecular Dynamics Flexible Fitting. |
精密化 | 空間: REAL / プロトコル: FLEXIBLE FIT |
得られたモデル | PDB-5a9e: |