+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 3jci | ||||||
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タイトル | 2.9 Angstrom Resolution Cryo-EM 3-D Reconstruction of Close-packed PCV2 Virus-like Particles | ||||||
要素 | Capsid protein | ||||||
キーワード | VIRUS LIKE PARTICLE / de novo initial model / consensus criterion / gold-standard FSC / true FSC / cross-validation | ||||||
機能・相同性 | 機能・相同性情報 viral capsid assembly / T=1 icosahedral viral capsid / endocytosis involved in viral entry into host cell / viral penetration into host nucleus / host cell nucleus / virion attachment to host cell / nucleus 類似検索 - 分子機能 | ||||||
生物種 | Porcine circovirus-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: 2.9 Å | ||||||
データ登録者 | Liu, Z. / Guo, F. / Wang, F. / Li, T.C. / Jiang, W. | ||||||
引用 | ジャーナル: Structure / 年: 2016 タイトル: 2.9 Å Resolution Cryo-EM 3D Reconstruction of Close-Packed Virus Particles. 著者: Zheng Liu / Fei Guo / Feng Wang / Tian-Cheng Li / Wen Jiang / 要旨: Single-particle cryoelectron microscopy typically discards close-packed particle images as unusable data. Here, we report an image processing strategy and case study of obtaining near-atomic ...Single-particle cryoelectron microscopy typically discards close-packed particle images as unusable data. Here, we report an image processing strategy and case study of obtaining near-atomic resolution 3D reconstructions from close-packed particles. Multiple independent de novo initial models were constructed to determine and cross-validate the particle parameters. The particles with consistent views were further refined including not only Euler angles and center positions but also defocus, astigmatism, beam tilt, and overall and anisotropic magnification. We demonstrated this strategy with a 2.9 Å resolution reconstruction of a 1.67 MDa virus-like particle of a circovirus, PCV2, recorded on 86 photographic films. The map resolution was further validated with a phase-randomization test and local resolution assessment, and the atomic model was validated with MolProbity and EMRinger. Close-packed virus particles were thus shown not only to be useful for high-resolution 3D reconstructions but also to allow data collection at significantly improved throughput for near-atomic resolution reconstructions. | ||||||
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 | 3jci.cif.gz | 51.8 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb3jci.ent.gz | 35.8 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 3jci.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 | 3jci_validation.pdf.gz | 769 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 3jci_full_validation.pdf.gz | 770.4 KB | 表示 | |
XML形式データ | 3jci_validation.xml.gz | 14.7 KB | 表示 | |
CIF形式データ | 3jci_validation.cif.gz | 19.1 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/jc/3jci ftp://data.pdbj.org/pub/pdb/validation_reports/jc/3jci | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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対称性 | 点対称性: (シェーンフリース記号: I (正20面体型対称)) |
-要素
#1: タンパク質 | 分子量: 21999.758 Da / 分子数: 1 / 断片: UNP residues 42-231 / 由来タイプ: 天然 / 由来: (天然) Porcine circovirus-2 (ウイルス) / 参照: UniProt: B8Y5Y9, UniProt: Q8B980*PLUS |
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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 |
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分子量 | 値: 1.67 MDa / 実験値: NO | ||||||||||||
ウイルスについての詳細 | 中空か: YES / エンベロープを持つか: NO / ホストのカテゴリ: VERTEBRATES / 単離: STRAIN / タイプ: VIRUS-LIKE PARTICLE | ||||||||||||
天然宿主 | 生物種: Sus scrofa | ||||||||||||
緩衝液 | 名称: PBS / pH: 7.4 / 詳細: PBS | ||||||||||||
試料 | 濃度: 3 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||
試料支持 | 詳細: 400-mesh holey carbon grids (1.2/1.3 C-flat, Protochips) | ||||||||||||
急速凍結 | 装置: GATAN CRYOPLUNGE 3 / 凍結剤: ETHANE / Temp: 85 K / 湿度: 90 % 詳細: Blot for 5 seconds before plunging into liquid ethane (GATAN CRYOPLUNGE 3). 手法: Blot for 5 seconds before plunging |
-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 / 日付: 2011年2月22日 |
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): 59000 X / 倍率(補正後): 587963 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): 200 nm / Cs: 2.7 mm 非点収差: Objective lens astigmatism was corrected at 250,000 magnification using quadrupole stigmator. |
試料ホルダ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER 温度: 90 K / 最高温度: 100 K / 最低温度: 80 K |
撮影 | 電子線照射量: 25 e/Å2 / フィルム・検出器のモデル: KODAK SO-163 FILM |
画像スキャン | デジタル画像の数: 141 |
-解析
EMソフトウェア |
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CTF補正 | 詳細: Each particle | ||||||||||||||||||||||||
対称性 | 点対称性: I (正20面体型対称) | ||||||||||||||||||||||||
3次元再構成 | 手法: Projection matching / 解像度: 2.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 50352 / ピクセルサイズ(公称値): 1.1 Å / ピクセルサイズ(実測値): 1.08 Å 詳細: For 3D reconstruction, whole datasets were divided into even and odd halves and the initial de novo models and subsequent iterative refinements were all independently performed for each half ...詳細: For 3D reconstruction, whole datasets were divided into even and odd halves and the initial de novo models and subsequent iterative refinements were all independently performed for each half dataset. Particles were selected from scanned micrograph images using e2boxer.py in EMAN2. The TEM instrument contrast transfer function parameters were determined automatically using fitctf2.py in JSPR and were then visually validated using the EMAN ctfit program. The datasets were then divided into two subsets (even and odd) and processed completely independently, including both de novo initial models and refinements. The images were first binned 4x to obtain initial models and particle parameters assuming icosahedral symmetry. De novo initial models were built using the random model approach. Random subsets of particles were assigned random initial orientations and iteratively refined until convergence. Multi-model competitive refinements were used to choose the winning model (with most assigned particles) as corrective initial models for subsequent refinement. Particles with inconsistent/unstable view parameters in the initial refinements were excluded in further image processing. The orientation and center parameters were then transferred to the un-binned images for high-resolution refinements which included Simplex method-based orientation/center optimization and grid search-based refinement of defocus, astigmatism, beam tilt, and overall and anisotropic magnification of the images. All image refinement and reconstructions were performed with JSPR software that was built on EMAN2 and EMAN library functions and programs. (Single particle details: The particles were selected using the e2boxer.py program in EMAN2. CTF parameters were determined using fitctf2.py in JSPR.) (Single particle--Applied symmetry: I) 対称性のタイプ: POINT | ||||||||||||||||||||||||
原子変位パラメータ | Biso max: 77.94 Å2 / Biso mean: 23.672 Å2 / Biso min: 10.28 Å2 | ||||||||||||||||||||||||
精密化ステップ | サイクル: LAST
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拘束条件 |
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