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- EMDB-37362: CryoEM structure of human PI3K-alpha (P85/P110-H1047R) with QR-79... -

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Basic information

Entry
Database: EMDB / ID: EMD-37362
TitleCryoEM structure of human PI3K-alpha (P85/P110-H1047R) with QR-7909 binding at an allosteric site
Map dataCryoEM density map of human PI3K-alpha (P85/P110-H1047R) with Cpd1 binding at the allosteric site
Sample
  • Complex: human PI3K-alpha (P85/P110-H1047R) with QR-7909 binding at an allosteric site
    • Protein or peptide: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
    • Protein or peptide: Phosphatidylinositol 3-kinase regulatory subunit alpha
  • Ligand: 6-chloranyl-3-[[(1R)-1-[2-(1,3-dihydropyrrolo[3,4-c]pyridin-2-yl)-3,6-dimethyl-4-oxidanylidene-quinazolin-8-yl]ethyl]amino]pyridine-2-carboxylic acid
  • Ligand: water
KeywordsPI3K-alpha / lipid kinase / allosteric inhibition / ONCOPROTEIN
Function / homology
Function and homology information


perinuclear endoplasmic reticulum membrane / regulation of toll-like receptor 4 signaling pathway / response to muscle inactivity / phosphatidylinositol kinase activity / regulation of actin filament organization / negative regulation of actin filament depolymerization / response to L-leucine / positive regulation of focal adhesion disassembly / response to butyrate / 1-phosphatidylinositol-3-kinase regulator activity ...perinuclear endoplasmic reticulum membrane / regulation of toll-like receptor 4 signaling pathway / response to muscle inactivity / phosphatidylinositol kinase activity / regulation of actin filament organization / negative regulation of actin filament depolymerization / response to L-leucine / positive regulation of focal adhesion disassembly / response to butyrate / 1-phosphatidylinositol-3-kinase regulator activity / phosphatidylinositol 3-kinase regulator activity / positive regulation of endoplasmic reticulum unfolded protein response / IRS-mediated signalling / phosphatidylinositol 3-kinase activator activity / interleukin-18-mediated signaling pathway / T follicular helper cell differentiation / phosphatidylinositol 3-kinase complex / PI3K events in ERBB4 signaling / autosome genomic imprinting / cellular response to hydrostatic pressure / phosphatidylinositol 3-kinase regulatory subunit binding / myeloid leukocyte migration / regulation of cellular respiration / neurotrophin TRKA receptor binding / Activated NTRK2 signals through PI3K / cis-Golgi network / negative regulation of fibroblast apoptotic process / Activated NTRK3 signals through PI3K / transmembrane receptor protein tyrosine kinase adaptor activity / ErbB-3 class receptor binding / 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 / phosphatidylinositol 3-kinase complex, class IA / Nephrin family interactions / RHOF GTPase cycle / kinase activator activity / Signaling by LTK in cancer / anoikis / 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 / 1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity / negative regulation of stress fiber assembly / 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 / growth hormone receptor signaling pathway / insulin binding / 1-phosphatidylinositol-3-kinase activity / Signaling by ALK / RHOB GTPase cycle / RHOV GTPase cycle / PI-3K cascade:FGFR3 / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / GP1b-IX-V activation signalling / natural killer cell mediated cytotoxicity / negative regulation of macroautophagy / PI-3K cascade:FGFR2 / response to dexamethasone / PI-3K cascade:FGFR4 / phosphatidylinositol-mediated signaling / 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 / RET signaling / negative regulation of anoikis / PI3K events in ERBB2 signaling / Interleukin-3, Interleukin-5 and GM-CSF signaling / PI3K Cascade / insulin receptor substrate binding / intercalated disc / T cell differentiation / RHOG GTPase cycle / extrinsic apoptotic signaling pathway via death domain receptors / negative regulation of cell-matrix adhesion / regulation of multicellular organism growth / RHOA GTPase cycle / protein kinase activator activity / CD28 dependent PI3K/Akt signaling / Role of LAT2/NTAL/LAB on calcium mobilization / RAC2 GTPase cycle
Similarity search - Function
PI3Kalpha, catalytic domain / Phosphatidylinositol 3-kinase regulatory subunit alpha, SH3 domain / PIK3R1, inter-SH2 domain / PI3K p85 subunit, C-terminal SH2 domain / PI3K regulatory subunit p85-related , inter-SH2 domain / PI3K p85 subunit, N-terminal SH2 domain / Phosphatidylinositol 3-kinase regulatory subunit P85 inter-SH2 domain / PI3-kinase family, p85-binding domain / PI3-kinase family, p85-binding domain / Rho GTPase-activating protein domain ...PI3Kalpha, catalytic domain / Phosphatidylinositol 3-kinase regulatory subunit alpha, SH3 domain / PIK3R1, inter-SH2 domain / PI3K p85 subunit, C-terminal SH2 domain / PI3K regulatory subunit p85-related , inter-SH2 domain / PI3K p85 subunit, N-terminal SH2 domain / Phosphatidylinositol 3-kinase regulatory subunit P85 inter-SH2 domain / PI3-kinase family, p85-binding domain / PI3-kinase family, p85-binding domain / Rho GTPase-activating protein domain / RhoGAP domain / Rho GTPase-activating proteins domain profile. / GTPase-activator protein for Rho-like GTPases / 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. / Rho GTPase activation protein / 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 / Phosphoinositide 3-kinase, catalytic domain / Phosphatidylinositol 3- and 4-kinase / Phosphatidylinositol 3- and 4-kinases catalytic domain profile. / Phosphatidylinositol 3-/4-kinase, catalytic domain / C2 domain superfamily / SH2 domain / Src homology 2 (SH2) domain profile. / Src homology 2 domains / SH2 domain / Src homology 3 domains / SH2 domain superfamily / SH3-like domain superfamily / Src homology 3 (SH3) domain profile. / SH3 domain / Armadillo-type fold / Ubiquitin-like domain superfamily / Protein kinase-like domain superfamily
Similarity search - Domain/homology
Phosphatidylinositol 3-kinase regulatory subunit alpha / Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsHuang X / Ren X / Zhong W
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Structure / Year: 2024
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
DepositionSep 5, 2023-
Header (metadata) releaseApr 17, 2024-
Map releaseApr 17, 2024-
UpdateJul 24, 2024-
Current statusJul 24, 2024Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_37362.png

Downloads & links

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Map

FileDownload / File: emd_37362.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryoEM density map of human PI3K-alpha (P85/P110-H1047R) with Cpd1 binding at the allosteric site
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.74 Å/pix.
x 256 pix.
= 189.44 Å		0.74 Å/pix.
x 256 pix.
= 189.44 Å		0.74 Å/pix.
x 256 pix.
= 189.44 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.74 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0443
Minimum - Maximum-0.18519157 - 0.25962484
Average (Standard dev.)-0.000040832954 (±0.008748267)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 189.44 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map 1 of Cpd1-bound human PI3K-alpha (P85/P110-H1047R)

Fileemd_37362_half_map_1.map
AnnotationHalf map 1 of Cpd1-bound human PI3K-alpha (P85/P110-H1047R)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map 2 of Cpd1-bound human PI3K-alpha (P85/P110-H1047R)

Fileemd_37362_half_map_2.map
AnnotationHalf map 2 of Cpd1-bound human PI3K-alpha (P85/P110-H1047R)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : human PI3K-alpha (P85/P110-H1047R) with QR-7909 binding at an all...

EntireName: human PI3K-alpha (P85/P110-H1047R) with QR-7909 binding at an allosteric site
Components
  • Complex: human PI3K-alpha (P85/P110-H1047R) with QR-7909 binding at an allosteric site
    • Protein or peptide: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
    • Protein or peptide: Phosphatidylinositol 3-kinase regulatory subunit alpha
  • Ligand: 6-chloranyl-3-[[(1R)-1-[2-(1,3-dihydropyrrolo[3,4-c]pyridin-2-yl)-3,6-dimethyl-4-oxidanylidene-quinazolin-8-yl]ethyl]amino]pyridine-2-carboxylic acid
  • Ligand: water

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Supramolecule #1: human PI3K-alpha (P85/P110-H1047R) with QR-7909 binding at an all...

SupramoleculeName: human PI3K-alpha (P85/P110-H1047R) with QR-7909 binding at an allosteric site
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit ...

MacromoleculeName: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: phosphatidylinositol 3-kinase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 124.23075 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MPPRPSSGEL WGIHLMPPRI LVECLLPNGM IVTLECLREA TLITIKHELF KEARKYPLHQ LLQDESSYIF VSVTQEAERE EFFDETRRL CDLRLFQPFL KVIEPVGNRE EKILNREIGF AIGMPVCEFD MVKDPEVQDF RRNILNVCKE AVDLRDLNSP H SRAMYVYP ...String:
MPPRPSSGEL WGIHLMPPRI LVECLLPNGM IVTLECLREA TLITIKHELF KEARKYPLHQ LLQDESSYIF VSVTQEAERE EFFDETRRL CDLRLFQPFL KVIEPVGNRE EKILNREIGF AIGMPVCEFD MVKDPEVQDF RRNILNVCKE AVDLRDLNSP H SRAMYVYP PNVESSPELP KHIYNKLDKG QIIVVIWVIV SPNNDKQKYT LKINHDCVPE QVIAEAIRKK TRSMLLSSEQ LK LCVLEYQ GKYILKVCGC DEYFLEKYPL SQYKYIRSCI MLGRMPNLML MAKESLYSQL PMDCFTMPSY SRRISTATPY MNG ETSTKS LWVINSALRI KILCATYVNV NIRDIDKIYV RTGIYHGGEP LCDNVNTQRV PCSNPRWNEW LNYDIYIPDL PRAA RLCLS ICSVKGRKGA KEEHCPLAWG NINLFDYTDT LVSGKMALNL WPVPHGLEDL LNPIGVTGSN PNKETPCLEL EFDWF SSVV KFPDMSVIEE HANWSVSREA GFSYSHAGLS NRLARDNELR ENDKEQLKAI STRDPLSEIT EQEKDFLWSH RHYCVT IPE ILPKLLLSVK WNSRDEVAQM YCLVKDWPPI KPEQAMELLD CNYPDPMVRG FAVRCLEKYL TDDKLSQYLI QLVQVLK YE QYLDNLLVRF LLKKALTNQR IGHFFFWHLK SEMHNKTVSQ RFGLLLESYC RACGMYLKHL NRQVEAMEKL INLTDILK Q EKKDETQKVQ MKFLVEQMRR PDFMDALQGF LSPLNPAHQL GNLRLEECRI MSSAKRPLWL NWENPDIMSE LLFQNNEII FKNGDDLRQD MLTLQIIRIM ENIWQNQGLD LRMLPYGCLS IGDCVGLIEV VRNSHTIMQI QCKGGLKGAL QFNSHTLHQW LKDKNKGEI YDAAIDLFTR SCAGYCVATF ILGIGDRHNS NIMVKDDGQL FHIDFGHFLD HKKKKFGYKR ERVPFVLTQD F LIVISKGA QECTKTREFE RFQEMCYKAY LAIRQHANLF INLFSMMLGS GMPELQSFDD IAYIRKTLAL DKTEQEALEY FM KQMNDAR HGGWTTKMDA AAHTIKQHAL N

UniProtKB: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform

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Macromolecule #2: Phosphatidylinositol 3-kinase regulatory subunit alpha

MacromoleculeName: Phosphatidylinositol 3-kinase regulatory subunit alpha
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 83.710281 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MSAEGYQYRA LYDYKKEREE DIDLHLGDIL TVNKGSLVAL GFSDGQEARP EEIGWLNGYN ETTGERGDFP GTYVEYIGRK KISPPTPKP RPPRPLPVAP GSSKTEADVE QQALTLPDLA EQFAPPDIAP PLLIKLVEAI EKKGLECSTL YRTQSSSNLA E LRQLLDCD ...String:
MSAEGYQYRA LYDYKKEREE DIDLHLGDIL TVNKGSLVAL GFSDGQEARP EEIGWLNGYN ETTGERGDFP GTYVEYIGRK KISPPTPKP RPPRPLPVAP GSSKTEADVE QQALTLPDLA EQFAPPDIAP PLLIKLVEAI EKKGLECSTL YRTQSSSNLA E LRQLLDCD TPSVDLEMID VHVLADAFKR YLLDLPNPVI PAAVYSEMIS LAPEVQSSEE YIQLLKKLIR SPSIPHQYWL TL QYLLKHF FKLSQTSSKN LLNARVLSEI FSPMLFRFSA ASSDNTENLI KVIEILISTE WNERQPAPAL PPKPPKPTTV ANN GMNNNM SLQDAEWYWG DISREEVNEK LRDTADGTFL VRDASTKMHG DYTLTLRKGG NNKLIKIFHR DGKYGFSDPL TFSS VVELI NHYRNESLAQ YNPKLDVKLL YPVSKYQQDQ VVKEDNIEAV GKKLHEYNTQ FQEKSREYDR LYEEYTRTSQ EIQMK RTAI EAFNETIKIF EEQCQTQERY SKEYIEKFKR EGNEKEIQRI MHNYDKLKSR ISEIIDSRRR LEEDLKKQAA EYREID KRM NSIKPDLIQL RKTRDQYLMW LTQKGVRQKK LNEWLGNENT EDQYSLVEDD EDLPHHDEKT WNVGSSNRNK AENLLRG KR DGTFLVRESS KQGCYACSVV VDGEVKHCVI NKTATGYGFA EPYNLYSSLK ELVLHYQHTS LVQHNDSLNV TLAYPVYA Q QRR

UniProtKB: Phosphatidylinositol 3-kinase regulatory subunit alpha

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Macromolecule #3: 6-chloranyl-3-[[(1R)-1-[2-(1,3-dihydropyrrolo[3,4-c]pyridin-2-yl)...

MacromoleculeName: 6-chloranyl-3-[[(1R)-1-[2-(1,3-dihydropyrrolo[3,4-c]pyridin-2-yl)-3,6-dimethyl-4-oxidanylidene-quinazolin-8-yl]ethyl]amino]pyridine-2-carboxylic acid
type: ligand / ID: 3 / Number of copies: 1 / Formula: UEX
Molecular weightTheoretical: 490.942 Da

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Macromolecule #4: water

MacromoleculeName: water / type: ligand / ID: 4 / Number of copies: 2 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 54.2 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: DIFFRACTION / Nominal defocus max: 1.3 µm / Nominal defocus min: 0.9 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: EMDB MAP
EMDB ID:

34272

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 420630
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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