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Open data
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Basic information
Entry | Database: PDB / ID: 8tu6 | |||||||||||||||||||||||||||||||||||||||||||||
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Title | CryoEM structure of PI3Kalpha | |||||||||||||||||||||||||||||||||||||||||||||
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![]() | CYTOSOLIC PROTEIN / PI3Kalapha / isoform selective / structure-based drug design. | |||||||||||||||||||||||||||||||||||||||||||||
Function / homology | ![]() perinuclear endoplasmic reticulum membrane / regulation of toll-like receptor 4 signaling pathway / response to muscle inactivity / phosphatidylinositol kinase activity / negative regulation of actin filament depolymerization / regulation of actin filament organization / response to L-leucine / positive regulation of focal adhesion disassembly / response to butyrate / phosphatidylinositol 3-kinase activator activity ...perinuclear endoplasmic reticulum membrane / regulation of toll-like receptor 4 signaling pathway / response to muscle inactivity / phosphatidylinositol kinase activity / negative regulation of actin filament depolymerization / regulation of actin filament organization / response to L-leucine / positive regulation of focal adhesion disassembly / response to butyrate / phosphatidylinositol 3-kinase activator activity / 1-phosphatidylinositol-3-kinase regulator activity / positive regulation of endoplasmic reticulum unfolded protein response / phosphatidylinositol 3-kinase regulator activity / IRS-mediated signalling / interleukin-18-mediated signaling pathway / T follicular helper cell differentiation / autosome genomic imprinting / phosphatidylinositol 3-kinase complex / myeloid leukocyte migration / PI3K events in ERBB4 signaling / cellular response to hydrostatic pressure / phosphatidylinositol 3-kinase regulatory subunit binding / regulation of cellular respiration / neurotrophin TRKA receptor binding / Activated NTRK2 signals through PI3K / cis-Golgi network / ErbB-3 class receptor binding / negative regulation of fibroblast apoptotic process / Activated NTRK3 signals through PI3K / transmembrane receptor protein tyrosine kinase adaptor activity / phosphatidylinositol 3-kinase complex, class IB / positive regulation of protein localization to membrane / vasculature development / 1-phosphatidylinositol-4-phosphate 3-kinase activity / Signaling by cytosolic FGFR1 fusion mutants / Co-stimulation by ICOS / RHOD GTPase cycle / cardiac muscle cell contraction / RHOF GTPase cycle / phosphatidylinositol 3-kinase complex, class IA / kinase activator activity / Nephrin family interactions / anoikis / Signaling by LTK in cancer / phosphatidylinositol-3-phosphate biosynthetic process / positive regulation of leukocyte migration / relaxation of cardiac muscle / Signaling by LTK / MET activates PI3K/AKT signaling / PI3K/AKT activation / negative regulation of stress fiber assembly / 1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity / RND1 GTPase cycle / positive regulation of filopodium assembly / phosphatidylinositol-4,5-bisphosphate 3-kinase / RND2 GTPase cycle / vascular endothelial growth factor signaling pathway / RND3 GTPase cycle / phosphatidylinositol 3-kinase / insulin binding / growth hormone receptor signaling pathway / 1-phosphatidylinositol-3-kinase activity / Signaling by ALK / RHOB GTPase cycle / RHOV GTPase cycle / PI-3K cascade:FGFR3 / natural killer cell mediated cytotoxicity / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / GP1b-IX-V activation signalling / negative regulation of macroautophagy / PI-3K cascade:FGFR2 / phosphatidylinositol-mediated signaling / PI-3K cascade:FGFR4 / response to dexamethasone / PI-3K cascade:FGFR1 / RHOC GTPase cycle / RHOJ GTPase cycle / intracellular glucose homeostasis / negative regulation of osteoclast differentiation / phosphatidylinositol phosphate biosynthetic process / Synthesis of PIPs at the plasma membrane / RHOU GTPase cycle / CDC42 GTPase cycle / negative regulation of anoikis / RET signaling / PI3K events in ERBB2 signaling / insulin receptor substrate binding / Interleukin-3, Interleukin-5 and GM-CSF signaling / PI3K Cascade / T cell differentiation / protein kinase activator activity / RHOG GTPase cycle / intercalated disc / extrinsic apoptotic signaling pathway via death domain receptors / regulation of multicellular organism growth / negative regulation of cell-matrix adhesion / RHOA GTPase cycle / CD28 dependent PI3K/Akt signaling / positive regulation of TOR signaling / Role of LAT2/NTAL/LAB on calcium mobilization Similarity search - Function | |||||||||||||||||||||||||||||||||||||||||||||
Biological species | ![]() | |||||||||||||||||||||||||||||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.12 Å | |||||||||||||||||||||||||||||||||||||||||||||
![]() | Valverde, R. / Shi, H. / Holliday, M. | |||||||||||||||||||||||||||||||||||||||||||||
Funding support | 1items
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![]() | ![]() Title: Discovery and Clinical Proof-of-Concept of RLY-2608, a First-in-Class Mutant-Selective Allosteric PI3Kα Inhibitor That Decouples Antitumor Activity from Hyperinsulinemia. Authors: Andreas Varkaris / Ermira Pazolli / Hakan Gunaydin / Qi Wang / Levi Pierce / Alessandro A Boezio / Artemisa Bulku / Lucian DiPietro / Cary Fridrich / Adam Frost / Fabrizio Giordanetto / ...Authors: Andreas Varkaris / Ermira Pazolli / Hakan Gunaydin / Qi Wang / Levi Pierce / Alessandro A Boezio / Artemisa Bulku / Lucian DiPietro / Cary Fridrich / Adam Frost / Fabrizio Giordanetto / Erika P Hamilton / Katherine Harris / Michael Holliday / Tamieka L Hunter / Amanda Iskandar / Yongli Ji / Alexandre Larivée / Jonathan R LaRochelle / André Lescarbeau / Fabien Llambi / Brenda Lormil / Mary M Mader / Brenton G Mar / Iain Martin / Thomas H McLean / Klaus Michelsen / Yakov Pechersky / Erika Puente-Poushnejad / Kevin Raynor / Dipali Rogala / Ramin Samadani / Alison M Schram / Kelley Shortsleeves / Sweta Swaminathan / Shahein Tajmir / Gege Tan / Yong Tang / Roberto Valverde / Bryan Wehrenberg / Jeremy Wilbur / Bret R Williams / Hongtao Zeng / Hanmo Zhang / W Patrick Walters / Beni B Wolf / David E Shaw / Donald A Bergstrom / James Watters / James S Fraser / Pascal D Fortin / D Randal Kipp / ![]() ![]() Abstract: PIK3CA (PI3Kα) is a lipid kinase commonly mutated in cancer, including ∼40% of hormone receptor-positive breast cancer. The most frequently observed mutants occur in the kinase and helical domains. ...PIK3CA (PI3Kα) is a lipid kinase commonly mutated in cancer, including ∼40% of hormone receptor-positive breast cancer. The most frequently observed mutants occur in the kinase and helical domains. Orthosteric PI3Kα inhibitors suffer from poor selectivity leading to undesirable side effects, most prominently hyperglycemia due to inhibition of wild-type (WT) PI3Kα. Here, we used molecular dynamics simulations and cryo-electron microscopy to identify an allosteric network that provides an explanation for how mutations favor PI3Kα activation. A DNA-encoded library screen leveraging electron microscopy-optimized constructs, differential enrichment, and an orthosteric-blocking compound led to the identification of RLY-2608, a first-in-class allosteric mutant-selective inhibitor of PI3Kα. RLY-2608 inhibited tumor growth in PIK3CA-mutant xenograft models with minimal impact on insulin, a marker of dysregulated glucose homeostasis. RLY-2608 elicited objective tumor responses in two patients diagnosed with advanced hormone receptor-positive breast cancer with kinase or helical domain PIK3CA mutations, with no observed WT PI3Kα-related toxicities. SIGNIFICANCE: Treatments for PIK3CA-mutant cancers are limited by toxicities associated with the inhibition of WT PI3Kα. Molecular dynamics, cryo-electron microscopy, and DNA-encoded libraries were ...SIGNIFICANCE: Treatments for PIK3CA-mutant cancers are limited by toxicities associated with the inhibition of WT PI3Kα. Molecular dynamics, cryo-electron microscopy, and DNA-encoded libraries were used to develop RLY-2608, a first-in-class inhibitor that demonstrates mutant selectivity in patients. This marks the advance of clinical mutant-selective inhibition that overcomes limitations of orthosteric PI3Kα inhibitors. See related commentary by Gong and Vanhaesebroeck, p. 204 . See related article by Varkaris et al., p. 227 . This article is featured in Selected Articles from This Issue, p. 201. | |||||||||||||||||||||||||||||||||||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 496.8 KB | Display | ![]() |
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PDB format | ![]() | 401.5 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1 MB | Display | ![]() |
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Full document | ![]() | 1 MB | Display | |
Data in XML | ![]() | 46.7 KB | Display | |
Data in CIF | ![]() | 71 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 41617MC ![]() 8ts7C ![]() 8ts8C ![]() 8ts9C ![]() 8tsaC ![]() 8tsbC ![]() 8tscC ![]() 8tsdC 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: 126301.992 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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#2: Protein | Mass: 83710.281 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
Has protein modification | N |
-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
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Molecular weight |
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Buffer solution | pH: 7.5 | ||||||||||||||||||||||||
Specimen | Conc.: 0.35 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES Details: The sample was purified as a heterodimer and was monodisperse. | ||||||||||||||||||||||||
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil 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: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: BASIC | |||||||||||||||
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER | |||||||||||||||
Image recording | Imaging-ID: 1 / Average exposure time: 2.68 sec. / Electron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)
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EM imaging optics | Energyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 6034364 | ||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.12 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 358240 / Details: non-uniform refinement / Num. of class averages: 1 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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