+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-5678 | |||||||||
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タイトル | Validated Near-Atomic Resolution Structure of Bacteriophage Epsilon15 Derived from Cryo-EM and Modeling | |||||||||
マップデータ | Reconstruction of infectious Epsilon15 bacteriophage. | |||||||||
試料 |
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キーワード | Cryo-EM / modeling / bacteriophage / validation / capsid / resolution / epsilon15 / random model / truly independent refinement / gold standard | |||||||||
機能・相同性 | : / Major coat protein-like / : / Major capsid protein GP7 / viral capsid, decoration / viral capsid / Major coat protein / Major capsid protein 機能・相同性情報 | |||||||||
生物種 | Salmonella phage epsilon15 (ファージ) | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 4.5 Å | |||||||||
データ登録者 | Baker ML / Hryc CF / Zhang Q / Wu W / Jakana J / Haase-Pettingell C / Afonine PV / Adams PD / King JA / Jiang W / Chiu W | |||||||||
引用 | ジャーナル: Proc Natl Acad Sci U S A / 年: 2013 タイトル: Validated near-atomic resolution structure of bacteriophage epsilon15 derived from cryo-EM and modeling. 著者: Matthew L Baker / Corey F Hryc / Qinfen Zhang / Weimin Wu / Joanita Jakana / Cameron Haase-Pettingell / Pavel V Afonine / Paul D Adams / Jonathan A King / Wen Jiang / Wah Chiu / 要旨: High-resolution structures of viruses have made important contributions to modern structural biology. Bacteriophages, the most diverse and abundant organisms on earth, replicate and infect all ...High-resolution structures of viruses have made important contributions to modern structural biology. Bacteriophages, the most diverse and abundant organisms on earth, replicate and infect all bacteria and archaea, making them excellent potential alternatives to antibiotics and therapies for multidrug-resistant bacteria. Here, we improved upon our previous electron cryomicroscopy structure of Salmonella bacteriophage epsilon15, achieving a resolution sufficient to determine the tertiary structures of both gp7 and gp10 protein subunits that form the T = 7 icosahedral lattice. This study utilizes recently established best practice for near-atomic to high-resolution (3-5 Å) electron cryomicroscopy data evaluation. The resolution and reliability of the density map were cross-validated by multiple reconstructions from truly independent data sets, whereas the models of the individual protein subunits were validated adopting the best practices from X-ray crystallography. Some sidechain densities are clearly resolved and show the subunit-subunit interactions within and across the capsomeres that are required to stabilize the virus. The presence of the canonical phage and jellyroll viral protein folds, gp7 and gp10, respectively, in the same virus suggests that epsilon15 may have emerged more recently relative to other bacteriophages. | |||||||||
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_5678.map.gz | 540.8 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-5678-v30.xml emd-5678.xml | 14.1 KB 14.1 KB | 表示 表示 | EMDBヘッダ |
画像 | emd_5678.png | 401.7 KB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-5678 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-5678 | HTTPS FTP |
-検証レポート
文書・要旨 | emd_5678_validation.pdf.gz | 417.3 KB | 表示 | EMDB検証レポート |
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文書・詳細版 | emd_5678_full_validation.pdf.gz | 416.9 KB | 表示 | |
XML形式データ | emd_5678_validation.xml.gz | 9.7 KB | 表示 | |
アーカイブディレクトリ | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-5678 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-5678 | 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_5678.map.gz / 形式: CCP4 / 大きさ: 1.4 GB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Reconstruction of infectious Epsilon15 bacteriophage. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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: 1.1942 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 : Bacteriophage epsilon15
全体 | 名称: Bacteriophage epsilon15 |
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要素 |
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-超分子 #1000: Bacteriophage epsilon15
超分子 | 名称: Bacteriophage epsilon15 / タイプ: sample / ID: 1000 / 詳細: As described in Jiang, 2008 (EMDB:5003) / Number unique components: 2 |
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分子量 | 実験値: 22 MDa |
-超分子 #1: Salmonella phage epsilon15
超分子 | 名称: Salmonella phage epsilon15 / タイプ: virus / ID: 1 / NCBI-ID: 215158 / 生物種: Salmonella phage epsilon15 / データベース: NCBI / ウイルスタイプ: VIRION / 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 |
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宿主 | 生物種: Salmonella (サルモネラ菌) / 別称: BACTERIA(EUBACTERIA) |
分子量 | 実験値: 22 MDa |
ウイルス殻 | Shell ID: 1 / 名称: Gp7 / 直径: 700 Å / T番号(三角分割数): 7 |
-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 | 単粒子再構成法 |
試料の集合状態 | particle |
-試料調製
緩衝液 | pH: 7.5 / 詳細: 50 mM Tris-HCl, pH 7.5, 25 mM NaCl, 5 mM MgCl2 |
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グリッド | 詳細: Quantifoil R2/2 grid |
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 II / 手法: Blot before plunging. |
-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 | 2007年1月3日 |
撮影 | カテゴリ: FILM / フィルム・検出器のモデル: KODAK SO-163 FILM デジタル化 - スキャナー: NIKON SUPER COOLSCAN 9000 デジタル化 - サンプリング間隔: 6.35 µm / 実像数: 1309 / 平均電子線量: 17 e/Å2 詳細: Digitized using Nikon Super CoolScan 9000 ED at 6.35 um/pixel ビット/ピクセル: 12 |
電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 倍率(補正後): 53361 / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 4.1 mm / 最大 デフォーカス(公称値): 2.7 µm / 最小 デフォーカス(公称値): 0.4 µm / 倍率(公称値): 50000 |
試料ステージ | 試料ホルダーモデル: JEOL 3200FSC CRYOHOLDER |
-画像解析
詳細 | Individual particles (720x720 pixels) were first automatically selected using the ethan method followed by manual screening using EMAN boxer program. A total of 54161 particles were selected for initial processing. The selected particles within a micrograph were incoherently averaged to generate 2D power spectra for contrast transfer function (CTF) parameter determination. CTF parameters were first automatically estimated and then visually verified using the EMAN1 ctfit program. Defocus values range from 0.5 to 2.5 um. The data set was divided into two data subsets for the following reconstruction steps. The particle images were first binned 4x for initial model building and initial determination of orientation and center parameters. The initial model was built de novo by iterative refinement of a subset of 300 particles randomly selected from the half data set with randomly assigned initial orientations. The initial orientations of all particles in each of the half data sets were determined using the EMAN1 projection matching program classesbymra with an angular projection step size of 3 degrees. The orientations were then refined to higher accuracy using the program jalign, which is based on simplex optimization of matching between the particle image and model projections. The particle orientation parameters were then transferred to particles binned at 2x and ultimately to particles without binning for further refinements. In the last stage of refinement, magnification, astigmatism, and defocus parameters were also included. 3D maps with icosahedral symmetry enforcement were reconstructed using a newly developed program j3dr using EMAN2 library and parallelized with message passing interface (MPI) to speed up the reconstruction process. These steps were iterated until the refinement converged. The map for each data subset was reconstructed from ~7000 particles by removing particles with poor alignment scores and unstable alignment parameters. The resolution of the map was evaluated using the Fourier Shell Correlation (FSC). Only the icosahedral shell region was included in this FSC analysis by masking out the external background noises and the internal DNA densities using soft masks with a half width of 6A. The final map of the entire dataset was then built from ~14000 particles by combining these two subsets of particles. |
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CTF補正 | 詳細: per particle |
最終 再構成 | アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 4.5 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: jspr, EMAN2, EMAN 詳細: The gold standard definition for the resolution estimate was adopted whereby the particle images were split into two subsets at the onset of image processing and the datasets were ...詳細: The gold standard definition for the resolution estimate was adopted whereby the particle images were split into two subsets at the onset of image processing and the datasets were individually reconstructed and then combined after determination of the resolution estimate. Independent initial models were built de novo and used for the subsequent particle refinements in each of the two subsets of particle images. The Fourier Shell Correlation (FSC) between the two independently determined reconstructions was computed and indicated a resolution 4.5 Angstrom using the 0.143 threshold for the combined dataset. 使用した粒子像数: 14000 |