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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: 8vgp | ||||||
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タイトル | CryoEM structure of Angiopoietin-2 in complex with engineered conformationally rigid Fab 5A12.6DS | ||||||
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![]() | CYTOKINE/IMMUNE SYSTEM / fab / antigen binding fragment / protein engineering / CYTOKINE-IMMUNE SYSTEM complex | ||||||
機能・相同性 | ![]() negative regulation of positive chemotaxis / Tie signaling pathway / glomerulus vasculature development / positive regulation of coagulation / germ cell development / negative regulation of blood vessel endothelial cell migration / negative regulation of cell-substrate adhesion / response to mechanical stimulus / animal organ regeneration / maternal process involved in female pregnancy ...negative regulation of positive chemotaxis / Tie signaling pathway / glomerulus vasculature development / positive regulation of coagulation / germ cell development / negative regulation of blood vessel endothelial cell migration / negative regulation of cell-substrate adhesion / response to mechanical stimulus / animal organ regeneration / maternal process involved in female pregnancy / response to glucose / : / Tie2 Signaling / negative regulation of angiogenesis / response to activity / cell projection / receptor tyrosine kinase binding / cellular response to growth factor stimulus / positive regulation of angiogenesis / blood coagulation / : / angiogenesis / gene expression / response to hypoxia / receptor ligand activity / signaling receptor binding / signal transduction / extracellular space / extracellular region / metal ion binding 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: 2.7 Å | ||||||
![]() | Kung, J.E. / Sudhamsu, J. | ||||||
資金援助 | 1件
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![]() | ![]() タイトル: Disulfi de constrained Fabs overcome target size limitation for high-resolution single-particle cryo-EM. 著者: Jennifer E Kung / Matthew C Johnson / Christine C Jao / Christopher P Arthur / Dimitry Tegunov / Alexis Rohou / Jawahar Sudhamsu / ![]() 要旨: High-resolution structures of proteins are critical to understanding molecular mechanisms of biological processes and in the discovery of therapeutic molecules. Cryo-EM has revolutionized structure ...High-resolution structures of proteins are critical to understanding molecular mechanisms of biological processes and in the discovery of therapeutic molecules. Cryo-EM has revolutionized structure determination of large proteins and their complexes, but a vast majority of proteins that underlie human diseases are small (< 50 kDa) and usually beyond its reach due to low signal-to-noise images and difficulties in particle alignment. Current strategies to overcome this problem increase the overall size of small protein targets using scaffold proteins that bind to the target, but are limited by inherent flexibility and not being bound to their targets in a rigid manner, resulting in the target being poorly resolved compared to the scaffolds. Here we present an iteratively engineered molecular design for transforming Fabs (antibody fragments), into conformationally rigid scaffolds (Rigid-Fabs) that, when bound to small proteins (~20 kDa), can enable high-resolution structure determination using cryo-EM. This design introduces multiple disulfide bonds at strategic locations, generates a well-folded Fab constrained into a rigid conformation and can be applied to Fabs from various species, isotypes and chimeric Fabs. We present examples of the Rigid Fab design enabling high-resolution (2.3-2.5 Å) structures of small proteins, Ang2 (26 kDa) and KRAS (21 kDa) by cryo-EM. The strategies for designing disulfide constrained Rigid Fabs in our work thus establish a general approach to overcome the target size limitation of single particle cryo-EM. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 139.7 KB | 表示 | ![]() |
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PDB形式 | ![]() | 105.5 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 969.6 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 970.2 KB | 表示 | |
XML形式データ | ![]() | 30.6 KB | 表示 | |
CIF形式データ | ![]() | 43.6 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 | ![]() 43220MC ![]() 8vegC ![]() 8vgeC ![]() 8vgfC ![]() 8vggC ![]() 8vghC ![]() 8vgiC ![]() 8vgjC ![]() 8vgkC ![]() 8vglC ![]() 8vgmC ![]() 8vgnC ![]() 8vgoC ![]() 8vgqC 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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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 26530.371 Da / 分子数: 1 / 断片: Receptor binding domain, UNP residues 225-444 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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#2: 抗体 | 分子量: 25234.367 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() 発現宿主: ![]() ![]() |
#3: 抗体 | 分子量: 23230.070 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() 発現宿主: ![]() ![]() |
#4: 化合物 | ChemComp-CA / |
#5: 水 | ChemComp-HOH / |
研究の焦点であるリガンドがあるか | N |
Has protein modification | Y |
-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 |
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由来(天然) |
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由来(組換発現) |
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緩衝液 | pH: 7.5 | ||||||||||||||||||||||||
緩衝液成分 |
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試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||||||||||||||
試料支持 | 詳細: The peak fraction was subjected to mild crosslinking with 0.5 mM BS3 at room temperature for 10 min. The crosslinking reaction was quenched by addition of 100mM Tris pH 7.5. グリッドの材料: GOLD / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R0.6/1 | ||||||||||||||||||||||||
急速凍結 | 凍結剤: ETHANE |
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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: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 105000 X / 最大 デフォーカス(公称値): 1500 nm / 最小 デフォーカス(公称値): 500 nm / Cs: 2.7 mm / C2レンズ絞り径: 70 µm |
撮影 | 電子線照射量: 68.5 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
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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: C1 (非対称) | ||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 2.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 1017611 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT | ||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 4ZFG Accession code: 4ZFG / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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