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基本情報
| 登録情報 | データベース: PDB / ID: 9dry | ||||||
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| タイトル | CHIP U-box dimer bound to Fab 2F1 | ||||||
要素 |
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キーワード | LIGASE/IMMUNE SYSTEM / E3 Ubiquitin Ligase / Fab / Epitope / Ubiquitination Inhibition / LIGASE / LIGASE-IMMUNE SYSTEM complex | ||||||
| 機能・相同性 | 機能・相同性情報positive regulation of chaperone-mediated protein complex assembly / regulation of glucocorticoid metabolic process / negative regulation of vascular associated smooth muscle contraction / negative regulation of peroxisome proliferator activated receptor signaling pathway / ubiquitin conjugating enzyme complex / positive regulation of ERAD pathway / positive regulation of mitophagy / positive regulation of smooth muscle cell apoptotic process / ERBB2 signaling pathway / negative regulation of cardiac muscle hypertrophy ...positive regulation of chaperone-mediated protein complex assembly / regulation of glucocorticoid metabolic process / negative regulation of vascular associated smooth muscle contraction / negative regulation of peroxisome proliferator activated receptor signaling pathway / ubiquitin conjugating enzyme complex / positive regulation of ERAD pathway / positive regulation of mitophagy / positive regulation of smooth muscle cell apoptotic process / ERBB2 signaling pathway / negative regulation of cardiac muscle hypertrophy / nuclear inclusion body / misfolded protein binding / cellular response to misfolded protein / protein folding chaperone complex / RIPK1-mediated regulated necrosis / ubiquitin-ubiquitin ligase activity / chaperone-mediated autophagy / SMAD binding / TPR domain binding / negative regulation of smooth muscle cell apoptotic process / protein quality control for misfolded or incompletely synthesized proteins / R-SMAD binding / positive regulation of proteolysis / protein K63-linked ubiquitination / protein monoubiquitination / ubiquitin ligase complex / endoplasmic reticulum unfolded protein response / protein autoubiquitination / heat shock protein binding / ERAD pathway / Hsp70 protein binding / positive regulation of protein ubiquitination / response to ischemia / Downregulation of TGF-beta receptor signaling / negative regulation of transforming growth factor beta receptor signaling pathway / Regulation of TNFR1 signaling / Hsp90 protein binding / G protein-coupled receptor binding / RING-type E3 ubiquitin transferase / regulation of protein stability / Regulation of necroptotic cell death / tau protein binding / kinase binding / Z disc / Downregulation of ERBB2 signaling / Regulation of PTEN stability and activity / protein polyubiquitination / ubiquitin-protein transferase activity / Regulation of RUNX2 expression and activity / ubiquitin protein ligase activity / positive regulation of proteasomal ubiquitin-dependent protein catabolic process / MAPK cascade / Antigen processing: Ubiquitination & Proteasome degradation / protein-folding chaperone binding / cellular response to heat / ubiquitin-dependent protein catabolic process / protein-macromolecule adaptor activity / cellular response to hypoxia / proteasome-mediated ubiquitin-dependent protein catabolic process / protein stabilization / protein ubiquitination / DNA repair / ubiquitin protein ligase binding / enzyme binding / endoplasmic reticulum / protein homodimerization activity / mitochondrion / nucleoplasm / nucleus / cytosol / cytoplasm 類似検索 - 分子機能 | ||||||
| 生物種 | Homo sapiens (ヒト) | ||||||
| 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: 7.02 Å | ||||||
データ登録者 | Unnikrishnan, A. / Southworth, D. | ||||||
| 資金援助 | 1件
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引用 | ジャーナル: J Biol Chem / 年: 2025タイトル: Recombinant antibodies inhibit enzymatic activity of the E3 ubiquitin ligase CHIP via multiple mechanisms. 著者: Dong Hee Chung / Emily J Connelly / Aparna Unnikrishnan / Shih-Wei Chuo / Kristin Wucherer / Cory M Nadel / Jason E Gestwicki / Daniel R Southworth / Charles S Craik / ![]() 要旨: Carboxyl-terminus of Hsp70-Interacting Protein (CHIP) is an E3 ubiquitin ligase that marks misfolded substrates for degradation. Hyper-activation of CHIP has been implicated in multiple diseases, ...Carboxyl-terminus of Hsp70-Interacting Protein (CHIP) is an E3 ubiquitin ligase that marks misfolded substrates for degradation. Hyper-activation of CHIP has been implicated in multiple diseases, including cystic fibrosis and cancer, suggesting that it may be a potential drug target. However, there are few tools available for exploring this possibility. Moreover, the best ways of inhibiting CHIP's function are not obvious, as this complex protein is composed of a tetratricopeptide repeat (TPR) domain, a U-box domain, and a coiled-coil domain that mediates homodimerization. To probe the structure and function of CHIP, we report an antibody panning campaign that yielded six recombinant Fabs with affinity for CHIP. Interestingly, these antibodies varied in their binding site(s) and impact on CHIP function, such as inhibiting TPR interactions, autoubiquitination, and/or substrate ubiquitination. Of particular interest, antibody 2F1 nearly eliminated substrate binding (IC = 2.7 μM) and limited ubiquitination and autoubiquitination. Cryo-electron microscopy of the 2F1:CHIP complex revealed a 2:1 binding mode (Fab:CHIP dimer), with 2F1 bound to the U-box domain and simultaneously displacing the TPR domain. Together, these studies provide insight into ways of inhibiting CHIP's activity and provide a series of new probes for exploring the function of this important E3 ubiquitin ligase. | ||||||
| 履歴 |
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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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 | 9dry.cif.gz | 178 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9dry.ent.gz | 122 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9dry.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
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/dr/9dry ftp://data.pdbj.org/pub/pdb/validation_reports/dr/9dry | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 47134MC 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 F&H 検索 |
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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: 8626.804 Da / 分子数: 2 / 断片: U-box domain / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: STUB1, CHIP, PP1131 / 発現宿主: ![]() #2: 抗体 | 分子量: 23432.230 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 発現宿主: ![]() #3: 抗体 | 分子量: 22929.486 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 発現宿主: ![]() 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: CHIP U-box dimer bound to Fab 2F1 / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT |
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| 由来(天然) | 生物種: Homo sapiens (ヒト) |
| 由来(組換発現) | 生物種: ![]() |
| 緩衝液 | pH: 7 |
| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
| 急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % 詳細: Wait time 10 sec, blot time 3 sec, blot force 0, Graphene Oxide coated grids |
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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: 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 / 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 |
| 撮影 | 電子線照射量: 66 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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| 3次元再構成 | 解像度: 7.02 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 16310 / 対称性のタイプ: POINT |
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Homo sapiens (ヒト)
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FIELD EMISSION GUN