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- PDB-9nie: Cryo-EM structure of the PI3K alpha/KRas/HER3 phosphopeptide comp... -

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Basic information

Entry
Database: PDB / ID: 9nie
TitleCryo-EM structure of the PI3K alpha/KRas/HER3 phosphopeptide complex on POPC/POPS/PIP2 nanodiscs low-pass filtered to 5 angstroms
Components
  • Isoform 2B of GTPase KRas
  • Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
KeywordsTransferase/Hydrolase / lipid kinase / GTPase / ONCOPROTEIN / Transferase-Hydrolase complex
Function / homology
Function and homology information


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 / TORC2 signaling / Co-stimulation by ICOS / Signaling by cytosolic FGFR1 fusion mutants / positive regulation of protein localization to membrane / 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 / PI3K/AKT activation / MET activates PI3K/AKT signaling / 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 / response to mineralocorticoid / GMP binding / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / forebrain astrocyte development / PI-3K cascade:FGFR3 / response to dexamethasone / LRR domain binding / PI-3K cascade:FGFR2 / negative regulation of macroautophagy / PI-3K cascade:FGFR4 / regulation of synaptic transmission, GABAergic / negative regulation of epithelial cell differentiation / PI-3K cascade:FGFR1 / response to isolation stress / response to gravity / phosphatidylinositol phosphate biosynthetic process / 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 / myoblast proliferation / negative regulation of anoikis / Signaling by RAS GAP mutants / Signaling by RAS GTPase mutants / Activation of RAS in B cells / Interleukin-3, Interleukin-5 and GM-CSF signaling / insulin receptor substrate binding / PI3K events in ERBB2 signaling / PI3K Cascade / intercalated disc / RAS signaling downstream of NF1 loss-of-function variants / RUNX3 regulates p14-ARF / skeletal muscle cell differentiation / Role of LAT2/NTAL/LAB on calcium mobilization / positive regulation of glial cell proliferation / regulation of multicellular organism growth / CD28 dependent PI3K/Akt signaling / RAC2 GTPase cycle / Interleukin receptor SHC signaling / SOS-mediated signalling / Activated NTRK3 signals through RAS / Activated NTRK2 signals through RAS / Role of phospholipids in phagocytosis / positive regulation of TOR signaling / adipose tissue development / protein kinase activator activity / cardiac muscle cell proliferation / SHC1 events in ERBB4 signaling / GAB1 signalosome / phagocytosis / Signalling to RAS / endothelial cell migration / SHC-related events triggered by IGF1R / Activated NTRK2 signals through FRS2 and FRS3 / Estrogen-stimulated signaling through PRKCZ / 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
Similarity search - Function
PI3Kalpha, catalytic domain / PI3-kinase family, p85-binding domain / PI3-kinase family, p85-binding domain / Phosphatidylinositol 3-kinase, adaptor-binding domain / Phosphatidylinositol 3-kinase adaptor-binding (PI3K ABD) domain profile. / PI3-kinase family, Ras-binding domain / Phosphatidylinositol 3-kinase Ras-binding (PI3K RBD) domain / PI3-kinase family, ras-binding domain / Phosphatidylinositol 3-kinase Ras-binding (PI3K RBD) domain profile. / C2 phosphatidylinositol 3-kinase-type domain ...PI3Kalpha, catalytic domain / PI3-kinase family, p85-binding domain / PI3-kinase family, p85-binding domain / Phosphatidylinositol 3-kinase, adaptor-binding domain / Phosphatidylinositol 3-kinase adaptor-binding (PI3K ABD) domain profile. / PI3-kinase family, Ras-binding domain / Phosphatidylinositol 3-kinase Ras-binding (PI3K RBD) domain / PI3-kinase family, ras-binding domain / Phosphatidylinositol 3-kinase Ras-binding (PI3K RBD) domain profile. / C2 phosphatidylinositol 3-kinase-type domain / Phosphoinositide 3-kinase C2 / C2 phosphatidylinositol 3-kinase (PI3K)-type domain profile. / Phosphoinositide 3-kinase, region postulated to contain C2 domain / Phosphoinositide 3-kinase family, accessory domain (PIK domain) / Phosphoinositide 3-kinase family, accessory domain (PIK domain) / Phosphoinositide 3-kinase, accessory (PIK) domain superfamily / Phosphoinositide 3-kinase, accessory (PIK) domain / Phosphatidylinositol kinase / PIK helical domain profile. / Phosphatidylinositol 3- and 4-kinases signature 1. / Phosphatidylinositol 3/4-kinase, conserved site / Phosphatidylinositol 3- and 4-kinases signature 2. / Phosphatidylinositol 3-/4-kinase, catalytic domain superfamily / Small GTPase, Ras-type / Phosphoinositide 3-kinase, catalytic domain / Phosphatidylinositol 3- and 4-kinase / Phosphatidylinositol 3- and 4-kinases catalytic domain profile. / Phosphatidylinositol 3-/4-kinase, catalytic domain / Small GTPase Ras domain profile. / Ran (Ras-related nuclear proteins) /TC4 subfamily of small GTPases / C2 domain superfamily / Rho (Ras homology) subfamily of Ras-like small GTPases / Ras subfamily of RAS small GTPases / Small GTPase / Ras family / Rab subfamily of small GTPases / Small GTP-binding protein domain / Armadillo-type fold / Ubiquitin-like domain superfamily / Protein kinase-like domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
: / PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER / GTPase KRas / Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 5 Å
AuthorsTorosyan, H. / Natalia, J. / Verba, K.A.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)U54CA274502 United States
CitationJournal: Biorxiv / Year: 2025
Title: Structures of the PI3K alpha /KRas complex on lipid bilayers reveal the molecular mechanism of PI3K alpha activation.
Authors: Torosyan, H. / Paul, M.D. / Maker, A. / Meyer, B.G. / Jura, N. / Verba, K.A.
History
DepositionFeb 26, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 13, 2026Provider: repository / Type: Initial release
Revision 1.0May 13, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0May 13, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 13, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 13, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0May 13, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0May 13, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
C: Isoform 2B of GTPase KRas
hetero molecules


Theoretical massNumber of molelcules
Total (without water)150,4675
Polymers149,3392
Non-polymers1,1283
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform / PtdIns-3-kinase subunit alpha / Phosphatidylinositol 4 / 5-bisphosphate 3-kinase 110 kDa catalytic ...PtdIns-3-kinase subunit alpha / Phosphatidylinositol 4 / 5-bisphosphate 3-kinase 110 kDa catalytic subunit alpha / p110alpha / Phosphoinositide-3-kinase catalytic alpha polypeptide / Serine/threonine protein kinase PIK3CA


Mass: 127822.578 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PIK3CA / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P42336, phosphatidylinositol-4,5-bisphosphate 3-kinase, non-specific serine/threonine protein kinase
#2: Protein Isoform 2B of GTPase KRas / K-Ras 2 / Ki-Ras / c-K-ras / c-Ki-ras


Mass: 21516.656 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KRAS, KRAS2, RASK2 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P01116, small monomeric GTPase
#3: Chemical ChemComp-A1AZD / tert-butyl [2-(2-{[(2P)-2-{4-[4-(2-amino-2-oxoethyl)-2-fluoroanilino]thieno[2,3-d]pyridazin-7-yl}phenyl]oxy}ethoxy)ethyl]carbamate


Mass: 581.658 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C29H32FN5O5S / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-GNP / PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER


Mass: 522.196 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H17N6O13P3 / Feature type: SUBJECT OF INVESTIGATION
Comment: GppNHp, GMPPNP, energy-carrying molecule analogue*YM
Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: full-length p85 alpha and p110 alpha heterodimer/KRas/HER3 phosphopeptide complex bound to POPC/POPS/PIP2-MSP1E3D1 nanodiscs
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.232609 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5 / Details: 50 mM Tris-HCL, 150 mM NaCl, 1mM TCEP
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 5 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 47.7 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.3.1particle selection
4cryoSPARC4.3.1CTF correction
7UCSF ChimeraX1.7.1model fitting
8Rosetta3model fitting
10Coot8model refinement
11ISOLDEmodel refinement
12cryoSPARC4.3.1initial Euler assignment
13cryoSPARC4.3.1final Euler assignment
15cryoSPARC4.3.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 6259852
3D reconstructionResolution: 5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 111698 / Symmetry type: POINT

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