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- PDB-8tsd: Human PI3K p85alpha/p110alpha bound to RLY-2608 -

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Entry
Database: PDB / ID: 8tsd
TitleHuman PI3K p85alpha/p110alpha bound to RLY-2608
Components
  • Phosphatidylinositol 3-kinase regulatory subunit alpha
  • Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
KeywordsSIGNALING PROTEIN / TRANSFERASE/INHIBITOR / Lipid kinase / TRANSFERASE-INHIBITOR complex
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 / phosphatidylinositol 3-kinase regulator activity / 1-phosphatidylinositol-3-kinase regulator activity / positive regulation of endoplasmic reticulum unfolded protein response / regulation of actin filament organization / negative regulation of actin filament depolymerization / phosphatidylinositol 3-kinase activator activity ...perinuclear endoplasmic reticulum membrane / regulation of toll-like receptor 4 signaling pathway / response to muscle inactivity / phosphatidylinositol kinase activity / phosphatidylinositol 3-kinase regulator activity / 1-phosphatidylinositol-3-kinase regulator activity / positive regulation of endoplasmic reticulum unfolded protein response / regulation of actin filament organization / negative regulation of actin filament depolymerization / phosphatidylinositol 3-kinase activator activity / response to butyrate / T follicular helper cell differentiation / IRS-mediated signalling / response to L-leucine / interleukin-18-mediated signaling pathway / phosphatidylinositol 3-kinase regulatory subunit binding / myeloid leukocyte migration / PI3K events in ERBB4 signaling / neurotrophin TRKA receptor binding / positive regulation of focal adhesion disassembly / cellular response to hydrostatic pressure / autosome genomic imprinting / cis-Golgi network / Activated NTRK2 signals through PI3K / ErbB-3 class receptor binding / transmembrane receptor protein tyrosine kinase adaptor activity / negative regulation of fibroblast apoptotic process / negative regulation of stress fiber assembly / 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 / RHOD GTPase cycle / positive regulation of protein localization to membrane / vasculature development / regulation of cellular respiration / Nephrin family interactions / RHOF GTPase cycle / kinase activator activity / Signaling by LTK in cancer / positive regulation of leukocyte migration / 1-phosphatidylinositol-4-phosphate 3-kinase activity / Signaling by LTK / anoikis / RND1 GTPase cycle / RND2 GTPase cycle / relaxation of cardiac muscle / positive regulation of filopodium assembly / RND3 GTPase cycle / 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 / growth hormone receptor signaling pathway / phosphatidylinositol 3-kinase / insulin binding / phosphatidylinositol-3-phosphate biosynthetic process / Signaling by ALK / RHOV GTPase cycle / cardiac muscle cell contraction / 1-phosphatidylinositol-3-kinase activity / vascular endothelial growth factor signaling pathway / RHOB GTPase cycle / natural killer cell mediated cytotoxicity / Erythropoietin activates Phosphoinositide-3-kinase (PI3K) / GP1b-IX-V activation signalling / PI-3K cascade:FGFR3 / response to dexamethasone / PI-3K cascade:FGFR2 / negative regulation of macroautophagy / PI-3K cascade:FGFR4 / PI-3K cascade:FGFR1 / RHOC GTPase cycle / RHOJ GTPase cycle / negative regulation of osteoclast differentiation / phosphatidylinositol phosphate biosynthetic process / phosphatidylinositol-mediated signaling / Synthesis of PIPs at the plasma membrane / RHOU GTPase cycle / CDC42 GTPase cycle / RET signaling / negative regulation of anoikis / T cell differentiation / Interleukin-3, Interleukin-5 and GM-CSF signaling / insulin receptor substrate binding / RHOG GTPase cycle / PI3K events in ERBB2 signaling / PI3K Cascade / negative regulation of cell-matrix adhesion / intercalated disc / extrinsic apoptotic signaling pathway via death domain receptors / RHOA GTPase cycle / Role of LAT2/NTAL/LAB on calcium mobilization / RAC3 GTPase cycle / CD28 dependent PI3K/Akt signaling / RAC2 GTPase cycle / regulation of multicellular organism growth
Similarity search - Function
Phosphatidylinositol 3-kinase regulatory subunit alpha, SH3 domain / PIK3R1, inter-SH2 domain / PI3Kalpha, catalytic 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 ...Phosphatidylinositol 3-kinase regulatory subunit alpha, SH3 domain / PIK3R1, inter-SH2 domain / PI3Kalpha, catalytic 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
Chem-XUZ / Phosphatidylinositol 3-kinase regulatory subunit alpha / Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.7 Å
AuthorsHolliday, M. / Tang, Y. / Bulku, A. / Wilbur, J. / Fraser, J.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Cancer Discov / Year: 2024
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
DepositionAug 11, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 22, 2023Provider: repository / Type: Initial release
Revision 1.1Feb 21, 2024Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
B: Phosphatidylinositol 3-kinase regulatory subunit alpha
hetero molecules


Theoretical massNumber of molelcules
Total (without water)159,7983
Polymers159,1902
Non-polymers6091
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area5820 Å2
ΔGint-19 kcal/mol
Surface area58510 Å2
MethodPISA
Unit cell
Length a, b, c (Å)86.902, 121.522, 192.652
Angle α, β, γ (deg.)90.000, 90.000, 90.000
Int Tables number19
Space group name H-MP212121
Space group name HallP2ac2ab
Symmetry operation#1: x,y,z
#2: x+1/2,-y+1/2,-z
#3: -x,y+1/2,-z+1/2
#4: -x+1/2,-y,z+1/2

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Components

#1: Protein Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform


Mass: 123229.391 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PIK3CA / Cell line (production host): Sf21 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P42336
#2: Protein Phosphatidylinositol 3-kinase regulatory subunit alpha


Mass: 35960.137 Da / Num. of mol.: 1 / Fragment: residues 318-615
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PIK3R1 / Cell line (production host): Sf21 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P27986
#3: Chemical ChemComp-XUZ / N-{(3R,6M)-3-(2-chloro-5-fluorophenyl)-6-[(4S)-5-cyano[1,2,4]triazolo[1,5-a]pyridin-6-yl]-1-oxo-2,3-dihydro-1H-isoindol-4-yl}-3-fluoro-5-(trifluoromethyl)benzamide / RLY-2608


Mass: 608.905 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C29H14ClF5N6O2 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 3.39 Å3/Da / Density % sol: 63.69 %
Crystal growTemperature: 293 K / Method: vapor diffusion, sitting drop / pH: 7.5 / Details: 0.1 M Hepes pH 7.5, 9% PEG-3350

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: SYNCHROTRON / Site: ALS / Beamline: 8.3.1 / Wavelength: 1.11584 Å
DetectorType: DECTRIS PILATUS3 S 6M / Detector: PIXEL / Date: Jul 16, 2020
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.11584 Å / Relative weight: 1
ReflectionResolution: 2.7→192.65 Å / Num. obs: 56880 / % possible obs: 100 % / Redundancy: 13.4 % / Biso Wilson estimate: 97.28 Å2 / CC1/2: 1 / Rmerge(I) obs: 0.073 / Rpim(I) all: 0.021 / Rrim(I) all: 0.076 / Net I/σ(I): 17
Reflection shellResolution: 2.7→2.78 Å / Redundancy: 13.2 % / Num. unique obs: 4580 / CC1/2: 0.426 / % possible all: 100

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Processing

Software
NameVersionClassification
ISOLDEmodel building
PHENIX1.20.1_4487refinement
autoPROCdata reduction
Aimlessdata scaling
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 2.7→102.78 Å / SU ML: 0.5811 / Cross valid method: FREE R-VALUE / σ(F): 1.33 / Phase error: 34.6535
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
RfactorNum. reflection% reflection
Rfree0.2771 1999 3.52 %
Rwork0.2386 54797 -
obs0.2399 56796 99.98 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.1 Å / Solvent model: FLAT BULK SOLVENT MODEL
Displacement parametersBiso mean: 118 Å2
Refinement stepCycle: LAST / Resolution: 2.7→102.78 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms10492 0 43 0 10535
Refine LS restraints
Refine-IDTypeDev idealNumber
X-RAY DIFFRACTIONf_bond_d0.00210760
X-RAY DIFFRACTIONf_angle_d0.467814519
X-RAY DIFFRACTIONf_chiral_restr0.03821568
X-RAY DIFFRACTIONf_plane_restr0.00351860
X-RAY DIFFRACTIONf_dihedral_angle_d12.3614129
LS refinement shell
Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkRefine-ID% reflection obs (%)
2.7-2.770.4651400.41453852X-RAY DIFFRACTION100
2.77-2.840.45321410.42263837X-RAY DIFFRACTION100
2.84-2.930.50191420.44463893X-RAY DIFFRACTION99.98
2.93-3.020.44531400.37013843X-RAY DIFFRACTION100
3.02-3.130.40281420.33573890X-RAY DIFFRACTION100
3.13-3.250.33251420.29243878X-RAY DIFFRACTION100
3.25-3.40.31141400.29563861X-RAY DIFFRACTION100
3.4-3.580.35311430.31523922X-RAY DIFFRACTION100
3.58-3.810.29361420.24283876X-RAY DIFFRACTION99.95
3.81-4.10.27491430.23163906X-RAY DIFFRACTION99.98
4.1-4.510.24611430.20663936X-RAY DIFFRACTION100
4.51-5.160.22711430.1833951X-RAY DIFFRACTION100
5.16-6.510.23521450.22573985X-RAY DIFFRACTION99.98
6.51-102.780.24881530.21284167X-RAY DIFFRACTION99.91
Refinement TLS params.Method: refined / Origin x: 11.0703573312 Å / Origin y: -4.89152862771 Å / Origin z: -19.44184754 Å
111213212223313233
T0.634246193317 Å2-0.0432160194396 Å2-0.0112265816055 Å2-0.620274597048 Å20.0122980838043 Å2--0.621155342149 Å2
L0.662760407518 °2-0.237670158623 °20.0922705344294 °2-1.07926188408 °2-0.270607437324 °2--1.06474623275 °2
S-0.0263985113045 Å °0.169470993793 Å °-0.120389342142 Å °0.120331043438 Å °-0.0573337915331 Å °0.0315454009315 Å °0.0298487460249 Å °0.213971909168 Å °0.0896968351905 Å °
Refinement TLS groupSelection details: all

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