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データを開く
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基本情報
登録情報 | データベース: EMDB / ID: EMD-5952 | |||||||||
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タイトル | CryoEM reconstruction model of Orsay virus-like particle | |||||||||
![]() | Reconstruction of recombinant Orsay virus-like particle | |||||||||
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![]() | virus-like particle | |||||||||
機能・相同性 | Nodavirus capsid / nodavirus capsid protein / Viral coat protein subunit / metal ion binding / Capsid protein alpha![]() | |||||||||
生物種 | ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 6.9 Å | |||||||||
![]() | Guo YR / Hryc C / Jakana J / Jiang H / Wang D / Chiu W / Zhong W / Tao YJ | |||||||||
![]() | ![]() タイトル: Crystal structure of a nematode-infecting virus. 著者: Yusong R Guo / Corey F Hryc / Joanita Jakana / Hongbing Jiang / David Wang / Wah Chiu / Weiwei Zhong / Yizhi J Tao / ![]() 要旨: Orsay, the first virus discovered to naturally infect Caenorhabditis elegans or any nematode, has a bipartite, positive-sense RNA genome. Sequence analyses show that Orsay is related to nodaviruses, ...Orsay, the first virus discovered to naturally infect Caenorhabditis elegans or any nematode, has a bipartite, positive-sense RNA genome. Sequence analyses show that Orsay is related to nodaviruses, but molecular characterizations of Orsay reveal several unique features, such as the expression of a capsid-δ fusion protein and the use of an ATG-independent mechanism for translation initiation. Here we report the crystal structure of an Orsay virus-like particle assembled from recombinant capsid protein (CP). Orsay capsid has a T = 3 icosahedral symmetry with 60 trimeric surface spikes. Each CP can be divided into three regions: an N-terminal arm that forms an extended protein interaction network at the capsid interior, an S domain with a jelly-roll, β-barrel fold forming the continuous capsid, and a P domain that forms surface spike projections. The structure of the Orsay S domain is best aligned to T = 3 plant RNA viruses but exhibits substantial differences compared with the insect-infecting alphanodaviruses, which also lack the P domain in their CPs. The Orsay P domain is remotely related to the P1 domain in calicivirus and hepatitis E virus, suggesting a possible evolutionary relationship. Removing the N-terminal arm produced a slightly expanded capsid with fewer nucleic acids packaged, suggesting that the arm is important for capsid stability and genome packaging. Because C. elegans-Orsay serves as a highly tractable model for studying viral pathogenesis, our results should provide a valuable structural framework for further studies of Orsay replication and infection. | |||||||||
履歴 |
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構造の表示
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構造ビューア | EMマップ: ![]() ![]() ![]() |
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マップデータ | ![]() | 12.3 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 12.9 KB 12.9 KB | 表示 表示 | ![]() |
画像 | ![]() ![]() | 109.4 KB 6.3 KB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-検証レポート
文書・要旨 | ![]() | 78.5 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 77.6 KB | 表示 | |
XML形式データ | ![]() | 494 B | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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リンク
EMDBのページ | ![]() ![]() |
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マップ
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注釈 | Reconstruction of recombinant Orsay virus-like particle | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 2.15 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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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
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試料の構成要素
-全体 : recombinant virus-like particle of Orsay virus
全体 | 名称: recombinant virus-like particle of Orsay virus |
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要素 |
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-超分子 #1000: recombinant virus-like particle of Orsay virus
超分子 | 名称: recombinant virus-like particle of Orsay virus / タイプ: sample / ID: 1000 / Number unique components: 1 |
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分子量 | 理論値: 7.7 MDa |
-超分子 #1: Orsay virus
超分子 | 名称: Orsay virus / タイプ: virus / ID: 1 / Name.synonym: Orsay virus-like particle / NCBI-ID: 977912 / 生物種: Orsay virus / ウイルスタイプ: VIRUS-LIKE PARTICLE / ウイルス・単離状態: SPECIES / ウイルス・エンベロープ: No / ウイルス・中空状態: No / Syn species name: Orsay virus-like particle |
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宿主 | 生物種: ![]() ![]() |
Host system | 生物種: ![]() ![]() |
分子量 | 理論値: 7.2 MDa |
ウイルス殻 | Shell ID: 1 / 名称: Orsay VLP Capsid Protein / 直径: 360 Å / T番号(三角分割数): 3 |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
濃度 | 4 mg/mL |
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緩衝液 | pH: 7.5 詳細: 50 mM Tris, 500 mM NaCl, 2 mM EDTA, 5 mM 2-mercaptoethanol |
グリッド | 詳細: 400 mesh Quantifoil R 1.2/1.3 copper grids with thin carbon support |
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 90 % / チャンバー内温度: 80 K / 装置: FEI VITROBOT MARK III / 手法: Blot for 2 seconds before plunging |
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電子顕微鏡法
顕微鏡 | JEOL 3200FSC |
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温度 | 平均: 81 K |
特殊光学系 | エネルギーフィルター - 名称: in-column filter 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: 25.0 eV |
日付 | 2012年10月2日 |
撮影 | カテゴリ: CCD フィルム・検出器のモデル: DIRECT ELECTRON DE-12 (4k x 3k) デジタル化 - サンプリング間隔: 6 µm / 実像数: 112 / 平均電子線量: 25 e/Å2 詳細: Each image is the average of subframes 2-36 after drift and damage correction. ビット/ピクセル: 10 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
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): 4.0 µm / 最小 デフォーカス(公称値): 1.3 µm / 倍率(公称値): 25000 |
試料ステージ | 試料ホルダーモデル: JEOL 3200FSC CRYOHOLDER |
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画像解析
詳細 | 112 images were imported into EMAN2, evaluated, and frames with a high amount of contamination and/or ice were removed. A total of 5,824 particles were boxed out (300 x 300 pixels) from the raw images using a semi-automated routine. Damage and drift correction done on the individual particles showed that minimal drift (<2A) had occurred for the complete data set. The corrected particles were imported back into EMAN2 and the contrast transfer function (CTF) was determined automatically followed by manual correction. Defocus was estimated to be between 1.3 and 4 um. Various subsets of particles were removed due on poor CTF parameters, resulting in the 4,332 particles that were used in the reconstruction. |
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CTF補正 | 詳細: Particles per frame |
最終 再構成 | アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 6.9 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: EMAN2 詳細: The final map was generated from two independent data sets. Small subsets (~200 particles) of each data set were extracted from each half of the data and binned by 4X. Two independent initial ...詳細: The final map was generated from two independent data sets. Small subsets (~200 particles) of each data set were extracted from each half of the data and binned by 4X. Two independent initial models were generated using EMAN2. The remaining particles were added to the two data sets and then refined independently (not binned) with icosahedral symmetry enforced. Angular step size was reduced after 15 iterations; after 25 iterations of refinement the data sets converged to a final density map. A low-pass filter was applied to the capsid protein portion of the density map and a soft-edge mask was used to remove the non-icosahedral portion of the density map (RNA). Gold Standard resolution assessment resulted in a final Fourier shell correlation (FSC) of 6.9A resolution between the two independent density maps, using the 0.143 criterion. The final density map was generated by combining the two data sets and performing one last round of refinement. 使用した粒子像数: 4332 |
最終 2次元分類 | クラス数: 25 |
-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: ![]() |
詳細 | The molecular model was determined by X-ray crystallography using this cryo-EM density map to phase the crystal. The model was then fit back into the density map with Chimera. |
精密化 | 空間: REAL / プロトコル: RIGID BODY FIT |