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- PDB-8w9b: CryoEM structure of human PI3K-alpha (P85/P110-H1047R) with QR-85... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8w9b | ||||||
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Title | CryoEM structure of human PI3K-alpha (P85/P110-H1047R) with QR-8557 binding at an allosteric site | ||||||
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![]() | ONCOPROTEIN / PI3K-alpha / lipid kinase / allosteric inhibition | ||||||
Function / homology | ![]() perinuclear endoplasmic reticulum membrane / response to muscle inactivity / negative regulation of actin filament depolymerization / regulation of toll-like receptor 4 signaling pathway / response to L-leucine / phosphatidylinositol kinase activity / regulation of actin filament organization / phosphatidylinositol 3-kinase regulator activity / response to butyrate / positive regulation of focal adhesion disassembly ...perinuclear endoplasmic reticulum membrane / response to muscle inactivity / negative regulation of actin filament depolymerization / regulation of toll-like receptor 4 signaling pathway / response to L-leucine / phosphatidylinositol kinase activity / regulation of actin filament organization / phosphatidylinositol 3-kinase regulator activity / response to butyrate / positive regulation of focal adhesion disassembly / autosome genomic imprinting / IRS-mediated signalling / cellular response to hydrostatic pressure / phosphatidylinositol 3-kinase activator activity / interleukin-18-mediated signaling pathway / PI3K events in ERBB4 signaling / myeloid leukocyte migration / 1-phosphatidylinositol-3-kinase regulator activity / phosphatidylinositol 3-kinase regulatory subunit binding / neurotrophin TRKA receptor binding / Activated NTRK2 signals through PI3K / positive regulation of protein localization to membrane / Activated NTRK3 signals through PI3K / cis-Golgi network / ErbB-3 class receptor binding / negative regulation of fibroblast apoptotic process / cardiac muscle cell contraction / RHOF GTPase cycle / kinase activator activity / phosphatidylinositol 3-kinase complex, class IB / vasculature development / transmembrane receptor protein tyrosine kinase adaptor activity / RHOD GTPase cycle / Signaling by cytosolic FGFR1 fusion mutants / regulation of cellular respiration / positive regulation of endoplasmic reticulum unfolded protein response / enzyme-substrate adaptor activity / phosphatidylinositol 3-kinase complex, class IA / anoikis / phosphatidylinositol 3-kinase complex / Nephrin family interactions / RND1 GTPase cycle / Costimulation by the CD28 family / relaxation of cardiac muscle / positive regulation of leukocyte migration / 1-phosphatidylinositol-4-phosphate 3-kinase activity / 1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity / MET activates PI3K/AKT signaling / RND2 GTPase cycle / PI3K/AKT activation / positive regulation of filopodium assembly / RND3 GTPase cycle / phosphatidylinositol-4,5-bisphosphate 3-kinase / vascular endothelial growth factor signaling pathway / negative regulation of stress fiber assembly / growth hormone receptor signaling pathway / phosphatidylinositol 3-kinase / insulin binding / phosphatidylinositol-3-phosphate biosynthetic process / RHOV GTPase cycle / 1-phosphatidylinositol-3-kinase activity / negative regulation of cell-matrix adhesion / Signaling by ALK / RHOB GTPase cycle / negative regulation of macroautophagy / GP1b-IX-V activation signalling / PI-3K cascade:FGFR3 / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / PI-3K cascade:FGFR2 / response to dexamethasone / RHOJ GTPase cycle / PI-3K cascade:FGFR4 / protein kinase activator activity / RHOC GTPase cycle / PI-3K cascade:FGFR1 / negative regulation of osteoclast differentiation / intracellular glucose homeostasis / CD28 dependent PI3K/Akt signaling / Synthesis of PIPs at the plasma membrane / phosphatidylinositol-mediated signaling / phosphatidylinositol phosphate biosynthetic process / CDC42 GTPase cycle / RHOU GTPase cycle / PI3K events in ERBB2 signaling / negative regulation of anoikis / T cell differentiation / RET signaling / intercalated disc / regulation of multicellular organism growth / insulin receptor substrate binding / Interleukin-3, Interleukin-5 and GM-CSF signaling / RHOG GTPase cycle / extrinsic apoptotic signaling pathway via death domain receptors / PI3K Cascade / RHOA GTPase cycle / positive regulation of TOR signaling / endothelial cell migration / RAC2 GTPase cycle / RAC3 GTPase cycle / Role of phospholipids in phagocytosis Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å | ||||||
![]() | Huang, X. / Ren, X. / Zhong, W. | ||||||
Funding support | 1items
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![]() | ![]() Title: Cryo-EM structures reveal two allosteric inhibition modes of PI3Kα involving a re-shaping of the activation loop. Authors: Xiuliang Huang / Kailiang Wang / Jing Han / Xiumei Chen / Zhenglin Wang / Tianlun Wu / Bo Yu / Feng Zhao / Xinjuan Wang / Huijuan Li / Zhi Xie / Xiaotian Zhu / Wenge Zhong / Xiaoming Ren / ![]() ![]() Abstract: PI3Kα is a lipid kinase that phosphorylates PIP2 and generates PIP3. The hyperactive PI3Kα mutation, H1047R, accounts for about 14% of breast cancer, making it a highly attractive target for drug ...PI3Kα is a lipid kinase that phosphorylates PIP2 and generates PIP3. The hyperactive PI3Kα mutation, H1047R, accounts for about 14% of breast cancer, making it a highly attractive target for drug discovery. Here, we report the cryo-EM structures of PI3Kα bound to two different allosteric inhibitors QR-7909 and QR-8557 at a global resolution of 2.7 Å and 3.0 Å, respectively. The structures reveal two distinct binding pockets on the opposite sides of the activation loop. Structural and MD simulation analyses show that the allosteric binding of QR-7909 and QR-8557 inhibit PI3Kα hyper-activity by reducing the fluctuation and mobility of the activation loop. Our work provides a strong rational basis for a further optimization and development of highly selective drug candidates to treat PI3Kα-driven cancers. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 239.5 KB | Display | ![]() |
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PDB format | ![]() | 187.5 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 53 KB | Display | |
Data in CIF | ![]() | 77.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 37363MC ![]() 8w9aC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 124230.750 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() References: UniProt: P42336, phosphatidylinositol 3-kinase, phosphatidylinositol-4,5-bisphosphate 3-kinase, non-specific serine/threonine protein kinase |
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#2: Protein | Mass: 33666.961 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
#3: Chemical | ChemComp-UJ3 / Mass: 395.427 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C22H22FN3O3 / Feature type: SUBJECT OF INVESTIGATION |
Has ligand of interest | Y |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: human PI3K-alpha (P85/P110-H1047R) with QR-8557 binding at an allosteric site Type: COMPLEX / Entity ID: #1-#2 / Source: MULTIPLE SOURCES |
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Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3 |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: DIFFRACTION / Nominal defocus max: 1500 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 48.5 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) |
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Processing
EM software | Name: PHENIX / Version: 1.13_2998: / Category: model refinement |
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CTF correction | Type: NONE |
3D reconstruction | Resolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 326253 / Symmetry type: POINT |