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Title | Cryo-EM structure of PI3Kalpha in complex with compound 16 | ||||||||||||||||||||||||||||||||||||
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![]() | Phosphoinositide 3-kinase / drug target / ligand / binding pocket / chemical scaffold / STRUCTURAL PROTEIN | ||||||||||||||||||||||||||||||||||||
Function / homology | ![]() perinuclear endoplasmic reticulum membrane / regulation of toll-like receptor 4 signaling pathway / response to muscle inactivity / negative regulation of actin filament depolymerization / phosphatidylinositol kinase activity / response to L-leucine / regulation of actin filament organization / response to butyrate / phosphatidylinositol 3-kinase regulator activity / positive regulation of focal adhesion disassembly ...perinuclear endoplasmic reticulum membrane / regulation of toll-like receptor 4 signaling pathway / response to muscle inactivity / negative regulation of actin filament depolymerization / phosphatidylinositol kinase activity / response to L-leucine / regulation of actin filament organization / response to butyrate / phosphatidylinositol 3-kinase regulator activity / positive regulation of focal adhesion disassembly / phosphatidylinositol 3-kinase activator activity / IRS-mediated signalling / 1-phosphatidylinositol-3-kinase regulator activity / positive regulation of endoplasmic reticulum unfolded protein response / cellular response to hydrostatic pressure / interleukin-18-mediated signaling pathway / T follicular helper cell differentiation / myeloid leukocyte migration / phosphatidylinositol 3-kinase complex / autosome genomic imprinting / PI3K events in ERBB4 signaling / phosphatidylinositol 3-kinase regulatory subunit binding / regulation of cellular respiration / neurotrophin TRKA receptor binding / positive regulation of protein localization to membrane / 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 / kinase activator activity / vasculature development / 1-phosphatidylinositol-4-phosphate 3-kinase activity / Signaling by cytosolic FGFR1 fusion mutants / cardiac muscle cell contraction / RHOD GTPase cycle / RHOF GTPase cycle / phosphatidylinositol 3-kinase complex, class IA / Nephrin family interactions / anoikis / phosphatidylinositol-3-phosphate biosynthetic process / Signaling by LTK in cancer / Regulation of T cell activation by CD28 family / positive regulation of leukocyte migration / enzyme-substrate adaptor activity / Signaling by LTK / MET activates PI3K/AKT signaling / growth hormone receptor signaling pathway / PI3K/AKT activation / 1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity / RND1 GTPase cycle / negative regulation of stress fiber assembly / positive regulation of filopodium assembly / phosphatidylinositol-4,5-bisphosphate 3-kinase / RND2 GTPase cycle / phosphatidylinositol 3-kinase / vascular endothelial growth factor signaling pathway / RND3 GTPase cycle / relaxation of cardiac muscle / insulin binding / 1-phosphatidylinositol-3-kinase activity / Signaling by ALK / natural killer cell mediated cytotoxicity / GP1b-IX-V activation signalling / RHOB GTPase cycle / negative regulation of macroautophagy / RHOV GTPase cycle / PI-3K cascade:FGFR3 / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / PI-3K cascade:FGFR2 / PI-3K cascade:FGFR4 / PI-3K cascade:FGFR1 / RHOC GTPase cycle / RHOJ GTPase cycle / phosphatidylinositol-mediated signaling / intracellular glucose homeostasis / negative regulation of osteoclast differentiation / phosphatidylinositol phosphate biosynthetic process / response to dexamethasone / Synthesis of PIPs at the plasma membrane / CD28 dependent PI3K/Akt signaling / RHOU GTPase cycle / PI3K events in ERBB2 signaling / CDC42 GTPase cycle / negative regulation of anoikis / RET signaling / T cell differentiation / Interleukin-3, Interleukin-5 and GM-CSF signaling / protein kinase activator activity / insulin receptor substrate binding / extrinsic apoptotic signaling pathway via death domain receptors / PI3K Cascade / RHOG GTPase cycle / regulation of multicellular organism growth / intercalated disc / endothelial cell migration / RHOA GTPase cycle / negative regulation of cell-matrix adhesion Similarity search - Function | ||||||||||||||||||||||||||||||||||||
Biological species | ![]() | ||||||||||||||||||||||||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.05 Å | ||||||||||||||||||||||||||||||||||||
![]() | Zhou Q / Liu X / Neri D / Li W / Favalli N / Bassi G / Yang S / Yang D / Vogt PK / Wang M-W | ||||||||||||||||||||||||||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: Structural insights into the interaction of three Y-shaped ligands with PI3Kα. Authors: Qingtong Zhou / Xiao Liu / Dario Neri / Wenxin Li / Nicholas Favalli / Gabriele Bassi / Su Yang / Dehua Yang / Peter K Vogt / Ming-Wei Wang / ![]() ![]() ![]() ![]() Abstract: Class IA phosphoinositide 3-kinase alpha (PI3Kα) is an important drug target because it is one of the most frequently mutated proteins in human cancers. However, small molecule inhibitors currently ...Class IA phosphoinositide 3-kinase alpha (PI3Kα) is an important drug target because it is one of the most frequently mutated proteins in human cancers. However, small molecule inhibitors currently on the market or under development have safety concerns due to a lack of selectivity. Therefore, other chemical scaffolds or unique mechanisms of catalytic kinase inhibition are needed. Here, we report the cryo-electron microscopy structures of wild-type PI3Kα, the dimer of p110α and p85α, in complex with three Y-shaped ligands [cpd16 (compound 16), cpd17 (compound 17), and cpd18 (compound 18)] of different affinities and no inhibitory effect on the kinase activity. Unlike ATP-competitive inhibitors, cpd17 adopts a Y-shaped conformation with one arm inserted into a binding pocket formed by R770 and W780 and the other arm lodged in the ATP-binding pocket at an angle that is different from that of the ATP phosphate tail. Such a special interaction induces a conformation of PI3Kα resembling that of the unliganded protein. These observations were confirmed with two isomers (cpd16 and cpd18). Further analysis of these Y-shaped ligands revealed the structural basis of differential binding affinities caused by stereo- or regiochemical modifications. Our results may offer a different direction toward the design of therapeutic agents against PI3Kα. | ||||||||||||||||||||||||||||||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 59.7 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 19.7 KB 19.7 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 9.1 KB | Display | ![]() |
Images | ![]() | 59 KB | ||
Others | ![]() ![]() | 59.4 MB 59.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 763 KB | Display | ![]() |
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Full document | ![]() | 762.6 KB | Display | |
Data in XML | ![]() | 16.3 KB | Display | |
Data in CIF | ![]() | 21.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8ilrMC ![]() 8ilsC ![]() 8ilvC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.071 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_35543_half_map_1.map | ||||||||||||
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Density Histograms |
-Half map: #1
File | emd_35543_half_map_2.map | ||||||||||||
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Density Histograms |
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Sample components
-Entire : Human PI3Kalpha in complex with compound 16
Entire | Name: Human PI3Kalpha in complex with compound 16 |
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Components |
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-Supramolecule #1: Human PI3Kalpha in complex with compound 16
Supramolecule | Name: Human PI3Kalpha in complex with compound 16 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit ...
Macromolecule | Name: 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 |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 127.822578 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MSYYHHHHHH DYDIPTTENL YFQGAMGSMP PRPSSGELWG IHLMPPRILV ECLLPNGMIV TLECLREATL ITIKHELFKE ARKYPLHQL LQDESSYIFV SVTQEAEREE FFDETRRLCD LRLFQPFLKV IEPVGNREEK ILNREIGFAI GMPVCEFDMV K DPEVQDFR ...String: MSYYHHHHHH DYDIPTTENL YFQGAMGSMP PRPSSGELWG IHLMPPRILV ECLLPNGMIV TLECLREATL ITIKHELFKE ARKYPLHQL LQDESSYIFV SVTQEAEREE FFDETRRLCD LRLFQPFLKV IEPVGNREEK ILNREIGFAI GMPVCEFDMV K DPEVQDFR RNILNVCKEA VDLRDLNSPH SRAMYVYPPN VESSPELPKH IYNKLDKGQI IVVIWVIVSP NNDKQKYTLK IN HDCVPEQ VIAEAIRKKT RSMLLSSEQL KLCVLEYQGK YILKVCGCDE YFLEKYPLSQ YKYIRSCIML GRMPNLMLMA KES LYSQLP MDCFTMPSYS RRISTATPYM NGETSTKSLW VINSALRIKI LCATYVNVNI RDIDKIYVRT GIYHGGEPLC DNVN TQRVP CSNPRWNEWL NYDIYIPDLP RAARLCLSIC SVKGRKGAKE EHCPLAWGNI NLFDYTDTLV SGKMALNLWP VPHGL EDLL NPIGVTGSNP NKETPCLELE FDWFSSVVKF PDMSVIEEHA NWSVSREAGF SYSHAGLSNR LARDNELREN DKEQLK AIS TRDPLSEITE QEKDFLWSHR HYCVTIPEIL PKLLLSVKWN SRDEVAQMYC LVKDWPPIKP EQAMELLDCN YPDPMVR GF AVRCLEKYLT DDKLSQYLIQ LVQVLKYEQY LDNLLVRFLL KKALTNQRIG HFFFWHLKSE MHNKTVSQRF GLLLESYC R ACGMYLKHLN RQVEAMEKLI NLTDILKQEK KDETQKVQMK FLVEQMRRPD FMDALQGFLS PLNPAHQLGN LRLEECRIM SSAKRPLWLN WENPDIMSEL LFQNNEIIFK NGDDLRQDML TLQIIRIMEN IWQNQGLDLR MLPYGCLSIG DCVGLIEVVR NSHTIMQIQ CKGGLKGALQ FNSHTLHQWL KDKNKGEIYD AAIDLFTRSC AGYCVATFIL GIGDRHNSNI MVKDDGQLFH I DFGHFLDH KKKKFGYKRE RVPFVLTQDF LIVISKGAQE CTKTREFERF QEMCYKAYLA IRQHANLFIN LFSMMLGSGM PE LQSFDDI AYIRKTLALD KTEQEALEYF MKQMNDAHHG GWTTKMDWIF HTIKQHALN UniProtKB: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform |
-Macromolecule #2: Phosphatidylinositol 3-kinase regulatory subunit alpha
Macromolecule | Name: Phosphatidylinositol 3-kinase regulatory subunit alpha type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 83.623203 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MAEGYQYRAL YDYKKEREED IDLHLGDILT VNKGSLVALG FSDGQEARPE EIGWLNGYNE TTGERGDFPG TYVEYIGRKK ISPPTPKPR PPRPLPVAPG SSKTEADVEQ QALTLPDLAE QFAPPDIAPP LLIKLVEAIE KKGLECSTLY RTQSSSNLAE L RQLLDCDT ...String: MAEGYQYRAL YDYKKEREED IDLHLGDILT VNKGSLVALG FSDGQEARPE EIGWLNGYNE TTGERGDFPG TYVEYIGRKK ISPPTPKPR PPRPLPVAPG SSKTEADVEQ QALTLPDLAE QFAPPDIAPP LLIKLVEAIE KKGLECSTLY RTQSSSNLAE L RQLLDCDT PSVDLEMIDV HVLADAFKRY LLDLPNPVIP AAVYSEMISL APEVQSSEEY IQLLKKLIRS PSIPHQYWLT LQ YLLKHFF KLSQTSSKNL LNARVLSEIF SPMLFRFSAA SSDNTENLIK VIEILISTEW NERQPAPALP PKPPKPTTVA NNG MNNNMS LQDAEWYWGD ISREEVNEKL RDTADGTFLV RDASTKMHGD YTLTLRKGGN NKLIKIFHRD GKYGFSDPLT FSSV VELIN HYRNESLAQY NPKLDVKLLY PVSKYQQDQV VKEDNIEAVG KKLHEYNTQF QEKSREYDRL YEEYTRTSQE IQMKR TAIE AFNETIKIFE EQCQTQERYS KEYIEKFKRE GNEKEIQRIM HNYDKLKSRI SEIIDSRRRL EEDLKKQAAE YREIDK RMN SIKPDLIQLR KTRDQYLMWL TQKGVRQKKL NEWLGNENTE DQYSLVEDDE DLPHHDEKTW NVGSSNRNKA ENLLRGK RD GTFLVRESSK QGCYACSVVV DGEVKHCVIN KTATGYGFAE PYNLYSSLKE LVLHYQHTSL VQHNDSLNVT LAYPVYAQ Q RR UniProtKB: Phosphatidylinositol 3-kinase regulatory subunit alpha |
-Macromolecule #3: N-[(2S)-1-(ethylamino)-1-oxidanylidene-3-[4-(2-quinoxalin-6-yleth...
Macromolecule | Name: N-[(2S)-1-(ethylamino)-1-oxidanylidene-3-[4-(2-quinoxalin-6-ylethynyl)phenyl]propan-2-yl]-2,3-dimethyl-quinoxaline-6-carboxamide type: ligand / ID: 3 / Number of copies: 1 / Formula: 7TZ |
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Molecular weight | Theoretical: 528.604 Da |
Chemical component information | ![]() ChemComp-7TZ: |
-Macromolecule #4: water
Macromolecule | Name: water / type: ligand / ID: 4 / Number of copies: 7 / Formula: HOH |
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Molecular weight | Theoretical: 18.015 Da |
Chemical component information | ![]() ChemComp-HOH: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 1.0 mg/mL |
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Buffer | pH: 7.6 |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 70.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: OTHER |
Electron optics | Illumination mode: OTHER / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.5 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |