+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 6ek5 | |||||||||
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タイトル | Near-atomic resolution structure of a plant geminivirus determined by electron cryo-microscopy. | |||||||||
要素 | Capsid proteinカプシド | |||||||||
キーワード | VIRUS (ウイルス) / African cassava mosaic virus / Geminivirus / ACMV | |||||||||
機能・相同性 | 機能・相同性情報 T=1 icosahedral viral capsid / viral penetration into host nucleus / symbiont entry into host cell / host cell nucleus / structural molecule activity / DNA binding / metal ion binding 類似検索 - 分子機能 | |||||||||
生物種 | African cassava mosaic virus (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: 4.2 Å | |||||||||
データ登録者 | Grimm, C. / Bottcher, B. / Hipp, K. / Jeske, H. | |||||||||
引用 | ジャーナル: Structure / 年: 2017 タイトル: Near-Atomic Resolution Structure of a Plant Geminivirus Determined by Electron Cryomicroscopy. 著者: Katharina Hipp / Clemens Grimm / Holger Jeske / Bettina Böttcher / 要旨: African cassava mosaic virus is a whitefly-transmitted geminivirus which forms unique twin particles of incomplete icosahedra that are joined at five-fold vertices, building an unusual waist. How its ...African cassava mosaic virus is a whitefly-transmitted geminivirus which forms unique twin particles of incomplete icosahedra that are joined at five-fold vertices, building an unusual waist. How its 22 capsomers interact within a half-capsid or across the waist is unknown thus far. Using electron cryo-microscopy and image processing, we determined the virion structure with a resolution of 4.2 Å and built an atomic model for its capsid protein. The inter-capsomer contacts mediated by the flexible N termini and loop regions differed within the half-capsids and at the waist, explaining partly the unusual twin structure. The tip of the pentameric capsomer is sealed by a plug formed by a turn region harboring the evolutionary conserved residue Y193. Basic amino acid residues inside the capsid form a positively charged pocket next to the five-fold axis of the capsomer suitable for binding DNA. Within this pocket, density most likely corresponding to DNA was resolved. | |||||||||
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 | 6ek5.cif.gz | 3.4 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb6ek5.ent.gz | 表示 | PDB形式 | |
PDBx/mmJSON形式 | 6ek5.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
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/ek/6ek5 ftp://data.pdbj.org/pub/pdb/validation_reports/ek/6ek5 | HTTPS FTP |
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-関連構造データ
関連構造データ | 3521 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: 24094.891 Da / 分子数: 110 / 由来タイプ: 組換発現 由来: (組換発現) African cassava mosaic virus (ウイルス) 株: isolate West Kenyan 844 / 遺伝子: AR1, AV1 / 発現宿主: African cassava mosaic virus (ウイルス) / 参照: UniProt: P03561 |
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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: African cassava mosaic virus - [West Kenya 844] / タイプ: VIRUS / Entity ID: all / 由来: NATURAL |
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分子量 | 値: 3.3 MDa / 実験値: NO |
由来(天然) | 生物種: African cassava mosaic virus - [West Kenya 844] |
ウイルスについての詳細 | 中空か: NO / エンベロープを持つか: NO / 単離: STRAIN / タイプ: VIRION |
天然宿主 | 生物種: Manihot esculenta |
緩衝液 | pH: 8 |
緩衝液成分 | 濃度: 0.1 M / 名称: Sodium Borate / 式: Na2B4O7 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: Quantifoil R1.2/1.3 + 2nm C. Glow discharged for 30-60 s with 25-28 MicroAmp (Quorum Tec Mini Sputter coater SC7620) and used within 1 hour グリッドの材料: COPPER / グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K 詳細: Samples (3 ?l) were applied to the glow discharged grids, incubated for 60 s on the grid, blotted and plunge frozen in liquid ethane using a Vitrobot IV (FEI, Eindhoven, The Netherlands) at ...詳細: Samples (3 ?l) were applied to the glow discharged grids, incubated for 60 s on the grid, blotted and plunge frozen in liquid ethane using a Vitrobot IV (FEI, Eindhoven, The Netherlands) at 4?C with 100% humidity and blotting from both sides for 3 s with blot force 7 |
-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 FIELDBright-field microscopy / 倍率(公称値): 94000 X / Calibrated defocus min: 780 nm / 最大 デフォーカス(補正後): 5600 nm / Cs: 0.01 mm / アライメント法: COMA FREE |
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 | 電子線照射量: 25 e/Å2 / 検出モード: INTEGRATING フィルム・検出器のモデル: FEI FALCON II (4k x 4k) 撮影したグリッド数: 1 / 実像数: 934 詳細: data acquisition with a cs-corrected FEI Titan Krios on a Falcon II direct detector at 300 kV. Data was acquired at a primary magnification of 94,000 (calibrated pixel size of 1.57 A) and ...詳細: data acquisition with a cs-corrected FEI Titan Krios on a Falcon II direct detector at 300 kV. Data was acquired at a primary magnification of 94,000 (calibrated pixel size of 1.57 A) and with a total dose of 25 e/A2 in 17 frames. In total 1,108 movies were recorded of which 934 movies were used for further processing. The movie frames were averaged after motion correction and dose weightin |
電子光学装置 | 球面収差補正装置: Krios - cs-corrector |
画像スキャン | 横: 4096 / 縦: 4096 / 動画フレーム数/画像: 17 / 利用したフレーム数/画像: 1-17 |
-解析
EMソフトウェア |
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画像処理 | 詳細: Images were motion correted and weighted for dose damage; the CTF was determined with CTFFIND 3 | ||||||||||||||||||||||||||||||||||||
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: 141141 詳細: For the initial analysis, ca. 2,000 particle images were selected manually with e2boxer and extracted and normalized with relion 1.4 followed by 2D-classification and ctf-correction. Three ...詳細: For the initial analysis, ca. 2,000 particle images were selected manually with e2boxer and extracted and normalized with relion 1.4 followed by 2D-classification and ctf-correction. Three characteristic class averages that resolved the two parts of the twin particle (side views and intermediate views) were selected as references for template-dependent automatic particle picking in Relion. Particle images were extracted at the determined coordinates with a box size of 300 x 300 Px and normalized for their grey value distribution followed by 2D-classification. Some of the 2D-classes showed disconnected twin particles or single capsids. These classes probably represented either adjacent capsids from different twin particles or incorrectly centered particles and were excluded from the subsequent analysis. 141141 particles is the number of automatically selected particles; 69685 were retained for he subsequent processing | ||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: D5 (2回x5回 2面回転対称) | ||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 4.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 24451 / 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 | B value: 139 / プロトコル: FLEXIBLE FIT / 空間: REAL | ||||||||||||||||||||||||||||||||||||
精密化 | 最高解像度: 4.2 Å |