+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 8ve7 | ||||||
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タイトル | A DARPin displayed on a designed tetrahedral protein scaffold | ||||||
要素 | DARPin protein scaffold | ||||||
キーワード | DE NOVO PROTEIN / scaffold / tetrahedral / darpin / symmetrical | ||||||
生物種 | synthetic construct (人工物) | ||||||
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 Å | ||||||
データ登録者 | Suder, D.S. / Gonen, S. | ||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: Int J Mol Sci / 年: 2024 タイトル: Mitigating the Blurring Effect of CryoEM Averaging on a Flexible and Highly Symmetric Protein Complex through Sub-Particle Reconstruction. 著者: Diana S Suder / Shane Gonen / 要旨: Many macromolecules are inherently flexible as a feature of their structure and function. During single-particle CryoEM processing, flexible protein regions can be detrimental to high-resolution ...Many macromolecules are inherently flexible as a feature of their structure and function. During single-particle CryoEM processing, flexible protein regions can be detrimental to high-resolution reconstruction as signals from thousands of particles are averaged together. This "blurring" effect can be difficult to overcome and is possibly more pronounced when averaging highly symmetric complexes. Approaches to mitigating flexibility during CryoEM processing are becoming increasingly critical as the technique advances and is applied to more dynamic proteins and complexes. Here, we detail the use of sub-particle averaging and signal subtraction techniques to precisely target and resolve flexible DARPin protein attachments on a designed tetrahedrally symmetric protein scaffold called DARP14. Particles are first aligned as full complexes, and then the symmetry is reduced by alignment and focused refinement of the constituent subunits. The final reconstructions we obtained were vastly improved over the fully symmetric reconstructions, with observable secondary structure and side-chain placement. Additionally, we were also able to reconstruct the core region of the scaffold to 2.7 Å. The data processing protocol outlined here is applicable to other dynamic and symmetric protein complexes, and our improved maps could allow for new structure-guided variant designs of DARP14. | ||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 8ve7.cif.gz | 61.2 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb8ve7.ent.gz | 43.7 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 8ve7.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 | 8ve7_validation.pdf.gz | 1 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 8ve7_full_validation.pdf.gz | 1 MB | 表示 | |
XML形式データ | 8ve7_validation.xml.gz | 23.4 KB | 表示 | |
CIF形式データ | 8ve7_validation.cif.gz | 34.3 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/ve/8ve7 ftp://data.pdbj.org/pub/pdb/validation_reports/ve/8ve7 | 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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1 |
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-要素
#1: タンパク質 | 分子量: 32208.723 Da / 分子数: 1 / 由来タイプ: 組換発現 詳細: with a helical connection to a chain of a designed protein scaffold 由来: (組換発現) synthetic construct (人工物) / 発現宿主: Escherichia coli BL21(DE3) (大腸菌) |
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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: DARPin with a helical connection to a chain of a designed protein scaffold タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
由来(天然) | 生物種: synthetic construct (人工物) |
由来(組換発現) | 生物種: Escherichia coli BL21(DE3) (大腸菌) |
緩衝液 | pH: 8 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE |
-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: OTHER |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 700 nm |
撮影 | 電子線照射量: 30 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
-解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||
3次元再構成 | 解像度: 4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 287323 詳細: resolution ranges drastically across the map, though. 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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