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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: PDB / ID: 9dz8 | ||||||||||||||||||||||||||||||
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タイトル | Catalytic domain of Dihydrolipoamide Succinytransferase | ||||||||||||||||||||||||||||||
![]() | Dihydrolipoyllysine-residue succinyltransferase component of 2-oxoglutarate dehydrogenase complex | ||||||||||||||||||||||||||||||
![]() | TRANSFERASE / E2 / 2-oxoglutarate dehydrogenase complex / catalytic domain / tricarboxylic acid cycle | ||||||||||||||||||||||||||||||
機能・相同性 | ![]() L-lysine catabolic process to acetyl-CoA via saccharopine / dihydrolipoyllysine-residue succinyltransferase / dihydrolipoyllysine-residue succinyltransferase activity / oxoglutarate dehydrogenase complex / tricarboxylic acid cycle / cytosol 類似検索 - 分子機能 | ||||||||||||||||||||||||||||||
生物種 | ![]() ![]() | ||||||||||||||||||||||||||||||
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: 2.51 Å | ||||||||||||||||||||||||||||||
![]() | Carr, K.D. / Borst, A.J. / Weidle, C. | ||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Protein identification using Cryo-EM and artificial intelligence guides improved sample purification. 著者: Kenneth D Carr / Dane Evan D Zambrano / Connor Weidle / Alex Goodson / Helen E Eisenach / Harley Pyles / Alexis Courbet / Neil P King / Andrew J Borst / ![]() 要旨: Protein purification is essential in protein biochemistry, structural biology, and protein design, enabling the determination of protein structures, the study of biological mechanisms, and the ...Protein purification is essential in protein biochemistry, structural biology, and protein design, enabling the determination of protein structures, the study of biological mechanisms, and the characterization of both natural and de novo designed proteins. However, standard purification strategies often encounter challenges, such as unintended co-purification of contaminants alongside the target protein. This issue is particularly problematic for self-assembling protein nanomaterials, where unexpected geometries may reflect novel assembly states, cross-contamination, or native proteins originating from the expression host. Here, we used an automated structure-to-sequence pipeline to first identify an unknown co-purifying protein found in several purified designed protein samples. By integrating cryo-electron microscopy (Cryo-EM), ModelAngelo's sequence-agnostic model-building, and Protein BLAST, we identified the contaminant as dihydrolipoamide succinyltransferase (DLST). This identification was validated through comparisons with DLST structures in the Protein Data Bank, AlphaFold 3 predictions based on the DLST sequence from our E. coli expression vector, and traditional biochemical methods. The identification informed subsequent modifications to our purification protocol, which successfully excluded DLST from future preparations. To explore the potential broader utility of this approach, we benchmarked four computational methods for DLST identification across varying resolution ranges. This study demonstrates the successful application of a structure-to-sequence protein identification workflow, integrating Cryo-EM, ModelAngelo, Protein BLAST, and AlphaFold 3 predictions, to identify and ultimately help guide the removal of DLST from sample purification efforts. It highlights the potential of combining Cryo-EM with AI-driven tools for accurate protein identification and addressing purification challenges across diverse contexts in protein science. | ||||||||||||||||||||||||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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ダウンロード
PDBx/mmCIF形式 | ![]() | 2 MB | 表示 | ![]() |
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PDB形式 | ![]() | 1.7 MB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 1.3 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.3 MB | 表示 | |
XML形式データ | ![]() | 149.5 KB | 表示 | |
CIF形式データ | ![]() | 188.5 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 47326MC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 26107.420 Da / 分子数: 24 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() 参照: UniProt: A0A140NDX4, dihydrolipoyllysine-residue succinyltransferase #2: 水 | ChemComp-HOH / | Has protein modification | N | |
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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 |
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試料調製
構成要素 | 名称: Dihydrolipoamide Succinyltransferase / タイプ: COMPLEX 詳細: This protein was observed as contaminant in a sample of a two component nanoparticle assembly. Entity ID: #1 / 由来: NATURAL |
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分子量 | 値: 1.056 MDa / 実験値: NO |
由来(天然) | 生物種: ![]() ![]() |
緩衝液 | pH: 8 |
試料 | 濃度: 0.3 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: This sample was heterogeneous and contamined both DLST and the designed nanoparticle assembly. |
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R2/2 |
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: 295.15 K 詳細: Wait time: 7.5 seconds Blot time: 0.5 seconds Blot force: 0 seconds |
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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: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 1800 nm / 最小 デフォーカス(公称値): 800 nm / Cs: 2.7 mm |
撮影 | 平均露光時間: 5 sec. / 電子線照射量: 47 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 実像数: 4264 詳細: 6211 movies were collected, the best 4264 were used for particle picking and further processing. |
画像スキャン | 横: 5760 / 縦: 4092 |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: O (正8面体型対称) | ||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 2.51 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 19033 / クラス平均像の数: 76 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | B value: 69.9 / プロトコル: OTHER / 空間: REAL / Target criteria: Cross-correlation coefficient 詳細: The final model was built to density using the UniProt sequence in ModelAngelo. Further refinement of the model to the density was performed using ISOLDE in ChimeraX, Coot, Phenix. Waters ...詳細: The final model was built to density using the UniProt sequence in ModelAngelo. Further refinement of the model to the density was performed using ISOLDE in ChimeraX, Coot, Phenix. Waters were built to one chain and then that chain and water network were rebuilt in ChimeraX using symmetry. | ||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | 詳細: ModelAngelo / Source name: Other / タイプ: in silico model |