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基本情報
| 登録情報 | データベース: PDB / ID: 9nie | ||||||||||||||||||||||||
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| タイトル | Cryo-EM structure of the PI3K alpha/KRas/HER3 phosphopeptide complex on POPC/POPS/PIP2 nanodiscs low-pass filtered to 5 angstroms | ||||||||||||||||||||||||
要素 |
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キーワード | Transferase/Hydrolase / lipid kinase / GTPase / ONCOPROTEIN / Transferase-Hydrolase complex | ||||||||||||||||||||||||
| 機能・相同性 | 機能・相同性情報response to muscle inactivity / regulation of actin filament organization / negative regulation of actin filament depolymerization / response to butyrate / IRS-mediated signalling / response to L-leucine / PI3K events in ERBB4 signaling / cellular response to hydrostatic pressure / autosome genomic imprinting / Activated NTRK2 signals through PI3K ...response to muscle inactivity / regulation of actin filament organization / negative regulation of actin filament depolymerization / response to butyrate / IRS-mediated signalling / response to L-leucine / PI3K events in ERBB4 signaling / cellular response to hydrostatic pressure / autosome genomic imprinting / Activated NTRK2 signals through PI3K / negative regulation of fibroblast apoptotic process / Activated NTRK3 signals through PI3K / phosphatidylinositol 3-kinase complex, class IB / phosphatidylinositol 3-kinase complex / Co-stimulation by ICOS / TORC2 signaling / positive regulation of protein localization to membrane / Signaling by cytosolic FGFR1 fusion mutants / vasculature development / regulation of cellular respiration / Nephrin family interactions / Signaling by LTK in cancer / 1-phosphatidylinositol-4-phosphate 3-kinase activity / Signaling by LTK / anoikis / relaxation of cardiac muscle / phosphatidylinositol 3-kinase complex, class IA / MET activates PI3K/AKT signaling / PI3K/AKT activation / phosphatidylinositol-4,5-bisphosphate 3-kinase / 1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity / phosphatidylinositol 3-kinase / phosphatidylinositol-3-phosphate biosynthetic process / Signaling by ALK / cardiac muscle cell contraction / 1-phosphatidylinositol-3-kinase activity / vascular endothelial growth factor signaling pathway / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / response to mineralocorticoid / PI-3K cascade:FGFR3 / GMP binding / response to dexamethasone / forebrain astrocyte development / LRR domain binding / PI-3K cascade:FGFR2 / PI-3K cascade:FGFR4 / negative regulation of macroautophagy / PI-3K cascade:FGFR1 / regulation of synaptic transmission, GABAergic / negative regulation of epithelial cell differentiation / response to isolation stress / phosphatidylinositol phosphate biosynthetic process / response to gravity / epithelial tube branching involved in lung morphogenesis / phosphatidylinositol-mediated signaling / type I pneumocyte differentiation / Synthesis of PIPs at the plasma membrane / Rac protein signal transduction / RET signaling / negative regulation of anoikis / myoblast proliferation / Signaling by RAS GAP mutants / Signaling by RAS GTPase mutants / Activation of RAS in B cells / Interleukin-3, Interleukin-5 and GM-CSF signaling / PI3K events in ERBB2 signaling / insulin receptor substrate binding / intercalated disc / PI3K Cascade / RAS signaling downstream of NF1 loss-of-function variants / Role of LAT2/NTAL/LAB on calcium mobilization / regulation of multicellular organism growth / RUNX3 regulates p14-ARF / CD28 dependent PI3K/Akt signaling / RAC2 GTPase cycle / skeletal muscle cell differentiation / positive regulation of glial cell proliferation / Interleukin receptor SHC signaling / adipose tissue development / Role of phospholipids in phagocytosis / SOS-mediated signalling / positive regulation of TOR signaling / Activated NTRK3 signals through RAS / Activated NTRK2 signals through RAS / GAB1 signalosome / protein kinase activator activity / cardiac muscle cell proliferation / SHC1 events in ERBB4 signaling / Signalling to RAS / endothelial cell migration / SHC-related events triggered by IGF1R / Activated NTRK2 signals through FRS2 and FRS3 / Estrogen-stimulated signaling through PRKCZ / phagocytosis / positive regulation of Rac protein signal transduction / SHC-mediated cascade:FGFR3 / glial cell proliferation / MET activates RAS signaling / SHC-mediated cascade:FGFR2 / SHC-mediated cascade:FGFR4 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: 5 Å | ||||||||||||||||||||||||
データ登録者 | Torosyan, H. / Natalia, J. / Verba, K.A. | ||||||||||||||||||||||||
| 資金援助 | 米国, 1件
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引用 | ジャーナル: bioRxiv / 年: 2025タイトル: Structures of the PI3Kα/KRas complex on lipid bilayers reveal the molecular mechanism of PI3Kα activation. 著者: Hayarpi Torosyan / Michael D Paul / Allison Maker / Brigitte G Meyer / Natalia Jura / Kliment A Verba 要旨: PI3Kα is a potent oncogene that converts PIP2 to PIP3 at the plasma membrane upon activation by receptor tyrosine kinases and Ras GTPases. In the absence of any structures of activated PI3Kα, the ...PI3Kα is a potent oncogene that converts PIP2 to PIP3 at the plasma membrane upon activation by receptor tyrosine kinases and Ras GTPases. In the absence of any structures of activated PI3Kα, the molecular details of its activation remain unknown. Here, we present cryo-EM structures of the PI3Kα/KRas complex embedded in lipid nanodiscs, revealing a rich ensemble of PI3Kα states adopted at the membrane surface. The sequential addition of a lipid bilayer, PIP2 and an activating phosphopeptide leads to the progressive release of key inhibitory domains from the PI3Kα catalytic core, which directly correlates with the reorganization of its active site. While association with POPC/POPS nanodiscs partially relieves PI3Kα autoinhibition, incorporation of PIP2 triggers near-complete displacement of PI3Kα inhibitory domains and significant restructuring of active site regulatory motifs. The addition of the activating phosphopeptide induces dimerization of the PI3Kα/KRas complex through a p110α catalytic subunit-mediated interface that is sterically occluded in autoinhibited PI3Kα. In cells, this dimeric PI3Kα complex amplifies Akt signaling in response to growth factor stimulation. Collectively, our structures map the conformational landscape of PI3Kα activation and reveal previously unexplored interfaces for potential therapeutic targeting. | ||||||||||||||||||||||||
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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 | 9nie.cif.gz | 421.6 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9nie.ent.gz | 表示 | PDB形式 | |
| PDBx/mmJSON形式 | 9nie.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/ni/9nie ftp://data.pdbj.org/pub/pdb/validation_reports/ni/9nie | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 49459MC ![]() 9ni3C ![]() 9ni4C ![]() 9ni5C ![]() 9ni6C ![]() 9ni7C ![]() 9ni8C ![]() 9nidC ![]() 9nifC ![]() 9nlcC 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
| #1: タンパク質 | 分子量: 127822.578 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: PIK3CA発現宿主: ![]() 参照: UniProt: P42336, phosphatidylinositol-4,5-bisphosphate 3-kinase, non-specific serine/threonine protein kinase |
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| #2: タンパク質 | 分子量: 21516.656 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: KRAS, KRAS2, RASK2 / 発現宿主: Trichoplusia ni (イラクサキンウワバ) / 参照: UniProt: P01116, small monomeric GTPase |
| #3: 化合物 | ChemComp-A1AZD / 分子量: 581.658 Da / 分子数: 1 / 由来タイプ: 合成 / 式: C29H32FN5O5S / タイプ: SUBJECT OF INVESTIGATION |
| #4: 化合物 | ChemComp-MG / |
| #5: 化合物 | ChemComp-GNP / |
| 研究の焦点であるリガンドがあるか | Y |
| Has protein modification | N |
-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: full-length p85 alpha and p110 alpha heterodimer/KRas/HER3 phosphopeptide complex bound to POPC/POPS/PIP2-MSP1E3D1 nanodiscs タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT |
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| 分子量 | 値: 0.232609 MDa / 実験値: NO |
| 由来(天然) | 生物種: Homo sapiens (ヒト) |
| 由来(組換発現) | 生物種: ![]() |
| 緩衝液 | pH: 7.5 / 詳細: 50 mM Tris-HCL, 150 mM NaCl, 1mM TCEP |
| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
| 試料支持 | 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 R1.2/1.3 |
| 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: 5 K |
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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 / 倍率(公称値): 105000 X / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 1000 nm / Cs: 2.7 mm |
| 試料ホルダ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
| 撮影 | 電子線照射量: 47.7 e/Å2 / フィルム・検出器のモデル: GATAN K3 (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 | ||||||||||||||||||||||||||||||||||||||||
| 粒子像の選択 | 選択した粒子像数: 6259852 | ||||||||||||||||||||||||||||||||||||||||
| 3次元再構成 | 解像度: 5 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 111698 / 対称性のタイプ: POINT |
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Homo sapiens (ヒト)
米国, 1件
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