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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: 9e8b | ||||||
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| タイトル | Integrin aIIbb3 intermediate conformation from human platelet membrane crude preparation | ||||||
要素 |
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キーワード | BLOOD CLOTTING / platelet membrane protein integrin aIIbb3 | ||||||
| 機能・相同性 | 機能・相同性情報tube development / regulation of serotonin uptake / positive regulation of adenylate cyclase-inhibiting opioid receptor signaling pathway / alpha9-beta1 integrin-ADAM8 complex / regulation of trophoblast cell migration / integrin alphaIIb-beta3 complex / regulation of postsynaptic neurotransmitter receptor diffusion trapping / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization ...tube development / regulation of serotonin uptake / positive regulation of adenylate cyclase-inhibiting opioid receptor signaling pathway / alpha9-beta1 integrin-ADAM8 complex / regulation of trophoblast cell migration / integrin alphaIIb-beta3 complex / regulation of postsynaptic neurotransmitter receptor diffusion trapping / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization / positive regulation of glomerular mesangial cell proliferation / platelet alpha granule membrane / integrin alphav-beta3 complex / negative regulation of lipoprotein metabolic process / alphav-beta3 integrin-PKCalpha complex / fibrinogen binding / blood coagulation, fibrin clot formation / alphav-beta3 integrin-HMGB1 complex / vascular endothelial growth factor receptor 2 binding / negative regulation of lipid transport / positive regulation of vascular endothelial growth factor signaling pathway / regulation of release of sequestered calcium ion into cytosol / Elastic fibre formation / mesodermal cell differentiation / glycinergic synapse / cell-substrate junction assembly / alphav-beta3 integrin-IGF-1-IGF1R complex / positive regulation of bone resorption / platelet-derived growth factor receptor binding / filopodium membrane / extracellular matrix binding / negative regulation of low-density lipoprotein particle clearance / angiogenesis involved in wound healing / positive regulation of vascular endothelial growth factor receptor signaling pathway / apolipoprotein A-I-mediated signaling pathway / positive regulation of cell adhesion mediated by integrin / regulation of bone resorption / positive regulation of leukocyte migration / apoptotic cell clearance / wound healing, spreading of epidermal cells / positive regulation of fibroblast migration / integrin complex / positive regulation of smooth muscle cell migration / heterotypic cell-cell adhesion / smooth muscle cell migration / Molecules associated with elastic fibres / negative chemotaxis / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / positive regulation of cell-matrix adhesion / cell adhesion mediated by integrin / Syndecan interactions / p130Cas linkage to MAPK signaling for integrins / positive regulation of osteoblast proliferation / cellular response to insulin-like growth factor stimulus / regulation of postsynaptic neurotransmitter receptor internalization / protein disulfide isomerase activity / microvillus membrane / cell-substrate adhesion / platelet-derived growth factor receptor signaling pathway / PECAM1 interactions / GRB2:SOS provides linkage to MAPK signaling for Integrins / TGF-beta receptor signaling activates SMADs / fibronectin binding / lamellipodium membrane / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / ECM proteoglycans / Integrin cell surface interactions / positive regulation of T cell migration / negative regulation of endothelial cell apoptotic process / coreceptor activity / cell adhesion molecule binding / cellular response to platelet-derived growth factor stimulus / positive regulation of endothelial cell proliferation / Integrin signaling / embryo implantation / positive regulation of substrate adhesion-dependent cell spreading / positive regulation of smooth muscle cell proliferation / positive regulation of endothelial cell migration / substrate adhesion-dependent cell spreading / protein kinase C binding / Turbulent (oscillatory, disturbed) flow shear stress activates signaling by PIEZO1 and integrins in endothelial cells / cell-matrix adhesion / Signal transduction by L1 / integrin-mediated signaling pathway / response to activity / regulation of actin cytoskeleton organization / wound healing / cellular response to mechanical stimulus / cell-cell adhesion / Signaling by high-kinase activity BRAF mutants / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / MAP2K and MAPK activation / platelet activation / VEGFA-VEGFR2 Pathway / platelet aggregation / cellular response to xenobiotic stimulus / integrin binding / ruffle membrane / positive regulation of fibroblast proliferation 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: 2.67 Å | ||||||
データ登録者 | Han, X. / Nieman, M.T. | ||||||
| 資金援助 | 米国, 1件
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引用 | ジャーナル: Blood Adv / 年: 2025タイトル: Elucidating the dynamics of integrin αIIbβ3 from native platelet membranes by cryo-EM with build-and-retrieve method. 著者: Xu Han / Zhemin Zhang / Chih-Chia Su / Meinan Lyu / Masaru Miyagi / Edward Yu / Marvin T Nieman 要旨: Platelets fulfill their essential physiological roles sensing the extracellular environment through their membrane proteins. The native membrane environment provides essential regulatory cues that ...Platelets fulfill their essential physiological roles sensing the extracellular environment through their membrane proteins. The native membrane environment provides essential regulatory cues that affect the protein structure and mechanism of action. Single-particle cryogenic electron microscopy (cryo-EM) has transformed structural biology by allowing high-resolution structures of membrane proteins to be solved from homogeneous samples. Our recent breakthroughs in data processing now make it feasible to obtain atomic-level-resolution protein structures from crude preparations in their native environments by integrating cryo-EM with the "build-and-retrieve" (BaR) data processing methodology. We applied this iterative bottom-up methodology on resting human platelet membranes for an in-depth systems biology approach to uncover how lipids, metal binding, post-translational modifications, and cofactor associations in the native environment regulate platelet function at the molecular level. Here, we report using cryo-EM followed by the BaR method to solve the unmodified integrin αIIbβ3 structure directly from resting human platelet membranes in its inactivated and intermediate states at 2.75 and 2.67 Å, respectively. Furthermore, we also solved a novel dimer conformation of αIIbβ3 at 2.85 Å formed by 2 intermediate states of αIIbβ3. This may indicate a previously unknown self-regulatory mechanism of αIIbβ3 in its native environment. In conclusion, our data show the power of using cryo-EM with the BaR method to determine 3 distinct structures including a novel dimer directly from natural sources. This approach allows us to identify unrecognized regulation mechanisms for proteins without artifacts owing to purification processes. These data have the potential to enrich our understanding of platelet signaling circuitry. | ||||||
| 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 | 9e8b.cif.gz | 230.9 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9e8b.ent.gz | 179.1 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9e8b.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 | 9e8b_validation.pdf.gz | 1.3 MB | 表示 | wwPDB検証レポート |
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| 文書・詳細版 | 9e8b_full_validation.pdf.gz | 1.3 MB | 表示 | |
| XML形式データ | 9e8b_validation.xml.gz | 47.3 KB | 表示 | |
| CIF形式データ | 9e8b_validation.cif.gz | 71.5 KB | 表示 | |
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/e8/9e8b ftp://data.pdbj.org/pub/pdb/validation_reports/e8/9e8b | HTTPS FTP |
-関連構造データ
| 関連構造データ | ![]() 47715MC ![]() 9e8aC ![]() 9e8cC 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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| 1 |
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要素
-タンパク質 , 2種, 2分子 AB
| #1: タンパク質 | 分子量: 65023.895 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Homo sapiens (ヒト) / 参照: UniProt: P08514 |
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| #2: タンパク質 | 分子量: 55880.992 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Homo sapiens (ヒト) / 参照: UniProt: P05106 |
-糖 , 3種, 7分子 
| #3: 多糖 | | #4: 多糖 | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-beta- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-beta-D-mannopyranose | タイプ: oligosaccharide / 分子量: 586.542 Da / 分子数: 1 / 由来タイプ: 組換発現 #6: 糖 | ChemComp-NAG / |
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-非ポリマー , 2種, 7分子 


| #5: 化合物 | ChemComp-CA / #7: 化合物 | ChemComp-MG / | |
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-詳細
| 研究の焦点であるリガンドがあるか | N |
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| 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 | 名称: Integrin aIIbb3 / タイプ: COMPLEX / Entity ID: #1-#2 / 由来: NATURAL |
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| 由来(天然) | 生物種: Homo sapiens (ヒト) |
| 緩衝液 | pH: 7.4 |
| 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 |
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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): 1500 nm / 最小 デフォーカス(公称値): 800 nm |
| 撮影 | 電子線照射量: 36.4 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 | 名称: PHENIX / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
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| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
| 3次元再構成 | 解像度: 2.67 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 518071 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
| 拘束条件 |
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万見について




Homo sapiens (ヒト)
米国, 1件
引用




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FIELD EMISSION GUN