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- PDB-8t2u: Cryo-EM Structures of Full-length Integrin alphaIIbbeta3 in Nativ... -

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Basic information

Entry
Database: PDB / ID: 8t2u
TitleCryo-EM Structures of Full-length Integrin alphaIIbbeta3 in Native Lipids complexed with Eptifibatide
Components
  • Eptifibatide
  • Integrin alpha-IIb
  • Integrin beta-3Integrin beta 3
KeywordsCELL ADHESION / complex / open headpiece
Function / homology
Function and homology information


tube development / regulation of serotonin uptake / positive regulation of adenylate cyclase-inhibiting opioid receptor signaling pathway / alpha9-beta1 integrin-ADAM8 complex / regulation of trophoblast cell migration / regulation of postsynaptic neurotransmitter receptor diffusion trapping / alphav-beta3 integrin-vitronectin complex / maintenance of postsynaptic specialization structure / regulation of extracellular matrix organization / platelet alpha granule membrane ...tube development / regulation of serotonin uptake / positive regulation of adenylate cyclase-inhibiting opioid receptor signaling pathway / alpha9-beta1 integrin-ADAM8 complex / regulation of trophoblast cell migration / regulation of postsynaptic neurotransmitter receptor diffusion trapping / alphav-beta3 integrin-vitronectin complex / maintenance of postsynaptic specialization structure / regulation of extracellular matrix organization / platelet alpha granule membrane / positive regulation of glomerular mesangial cell proliferation / integrin alphav-beta3 complex / negative regulation of lipoprotein metabolic process / alphav-beta3 integrin-PKCalpha complex / fibrinogen binding / glycinergic synapse / alphav-beta3 integrin-HMGB1 complex / vascular endothelial growth factor receptor 2 binding / blood coagulation, fibrin clot formation / negative regulation of lipid transport / negative regulation of low-density lipoprotein receptor activity / Elastic fibre formation / regulation of release of sequestered calcium ion into cytosol / cell-substrate junction assembly / mesodermal cell differentiation / angiogenesis involved in wound healing / alphav-beta3 integrin-IGF-1-IGF1R complex / platelet-derived growth factor receptor binding / filopodium membrane / extracellular matrix binding / positive regulation of fibroblast migration / positive regulation of vascular endothelial growth factor receptor signaling pathway / regulation of postsynaptic neurotransmitter receptor internalization / apolipoprotein A-I-mediated signaling pathway / regulation of bone resorption / wound healing, spreading of epidermal cells / apoptotic cell clearance / heterotypic cell-cell adhesion / positive regulation of cell adhesion mediated by integrin / integrin complex / Molecules associated with elastic fibres / cellular response to insulin-like growth factor stimulus / positive regulation of leukocyte migration / cell adhesion mediated by integrin / positive regulation of cell-matrix adhesion / smooth muscle cell migration / microvillus membrane / Syndecan interactions / negative chemotaxis / p130Cas linkage to MAPK signaling for integrins / cellular response to platelet-derived growth factor stimulus / cell-substrate adhesion / protein disulfide isomerase activity / positive regulation of smooth muscle cell migration / activation of protein kinase activity / positive regulation of osteoblast proliferation / TGF-beta receptor signaling activates SMADs / PECAM1 interactions / lamellipodium membrane / GRB2:SOS provides linkage to MAPK signaling for Integrins / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / platelet-derived growth factor receptor signaling pathway / fibronectin binding / ECM proteoglycans / positive regulation of bone resorption / positive regulation of T cell migration / Integrin cell surface interactions / coreceptor activity / negative regulation of endothelial cell apoptotic process / positive regulation of substrate adhesion-dependent cell spreading / embryo implantation / positive regulation of endothelial cell proliferation / cell adhesion molecule binding / Integrin signaling / substrate adhesion-dependent cell spreading / cell-matrix adhesion / positive regulation of endothelial cell migration / protein kinase C binding / response to activity / Signal transduction by L1 / integrin-mediated signaling pathway / regulation of actin cytoskeleton organization / positive regulation of smooth muscle cell proliferation / Signaling by high-kinase activity BRAF mutants / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / MAP2K and MAPK activation / wound healing / cell-cell adhesion / platelet aggregation / platelet activation / ruffle membrane / VEGFA-VEGFR2 Pathway / cellular response to mechanical stimulus / positive regulation of angiogenesis / Signaling by RAF1 mutants / Signaling by moderate kinase activity BRAF mutants / Paradoxical activation of RAF signaling by kinase inactive BRAF / Signaling downstream of RAS mutants / regulation of protein localization
Similarity search - Function
Integrin beta, epidermal growth factor-like domain 1 / Integrin beta epidermal growth factor like domain 1 / Integrin beta subunit, cytoplasmic domain / Integrin beta cytoplasmic domain / Integrin_b_cyt / : / Integrin alpha Ig-like domain 3 / Integrin beta tail domain / Integrin beta subunit, tail / Integrin beta tail domain superfamily ...Integrin beta, epidermal growth factor-like domain 1 / Integrin beta epidermal growth factor like domain 1 / Integrin beta subunit, cytoplasmic domain / Integrin beta cytoplasmic domain / Integrin_b_cyt / : / Integrin alpha Ig-like domain 3 / Integrin beta tail domain / Integrin beta subunit, tail / Integrin beta tail domain superfamily / Integrin_B_tail / Integrin beta subunit, VWA domain / Integrin beta subunit / Integrin beta N-terminal / Integrin beta chain VWA domain / Integrin plexin domain / Integrins beta chain cysteine-rich domain signature. / Integrin beta subunits (N-terminal portion of extracellular region) / Integrin alpha cytoplasmic region / EGF-like domain, extracellular / EGF-like domain / Integrin alpha-2 / Integrin alpha Ig-like domain 1 / : / Integrin alpha Ig-like domain 2 / Integrin alpha chain / Integrin alpha beta-propellor / Integrin alpha chain, C-terminal cytoplasmic region, conserved site / Integrins alpha chain signature. / FG-GAP repeat profile. / Integrin alpha (beta-propellor repeats). / FG-GAP repeat / FG-GAP repeat / Integrin domain superfamily / Integrin alpha, N-terminal / PSI domain / domain found in Plexins, Semaphorins and Integrins / von Willebrand factor A-like domain superfamily / EGF-like domain signature 2. / EGF-like domain signature 1.
Similarity search - Domain/homology
Integrin beta-3 / Integrin alpha-IIb
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsAdair, B. / Xiong, J.P. / Yeager, M. / Arnaout, M.A.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)HL141366 United States
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)DK088327 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM084545 United States
CitationJournal: Nat Commun / Year: 2023
Title: Cryo-EM structures of full-length integrin αIIbβ3 in native lipids.
Authors: Brian D Adair / Jian-Ping Xiong / Mark Yeager / M Amin Arnaout /
Abstract: Platelet integrin αIIbβ3 is maintained in a bent inactive state (low affinity to physiologic ligand), but can rapidly switch to a ligand-competent (high-affinity) state in response to intracellular ...Platelet integrin αIIbβ3 is maintained in a bent inactive state (low affinity to physiologic ligand), but can rapidly switch to a ligand-competent (high-affinity) state in response to intracellular signals ("inside-out" activation). Once bound, ligands drive proadhesive "outside-in" signaling. Anti-αIIbβ3 drugs like eptifibatide can engage the inactive integrin directly, inhibiting thrombosis but inadvertently impairing αIIbβ3 hemostatic functions. Bidirectional αIIbβ3 signaling is mediated by reorganization of the associated αIIb and β3 transmembrane α-helices, but the underlying changes remain poorly defined absent the structure of the full-length receptor. We now report the cryo-EM structures of full-length αIIbβ3 in its apo and eptifibatide-bound states in native cell-membrane nanoparticles at near-atomic resolution. The apo form adopts the bent inactive state but with separated transmembrane α-helices, and a fully accessible ligand-binding site that challenges the model that this site is occluded by the plasma membrane. Bound eptifibatide triggers dramatic conformational changes that may account for impaired hemostasis. These results advance our understanding of integrin structure and function and may guide development of safer inhibitors.
History
DepositionJun 6, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 26, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Integrin alpha-IIb
B: Integrin beta-3
C: Eptifibatide
hetero molecules


Theoretical massNumber of molelcules
Total (without water)198,04715
Polymers195,4183
Non-polymers2,62912
Water362
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 2 types, 2 molecules AB

#1: Protein Integrin alpha-IIb / GPalpha IIb / GPIIb / Platelet membrane glycoprotein IIb


Mass: 110106.391 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P08514
#2: Protein Integrin beta-3 / Integrin beta 3 / Platelet membrane glycoprotein IIIa / GPIIIa


Mass: 84478.500 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P05106

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Protein/peptide , 1 types, 1 molecules C

#3: Protein/peptide Eptifibatide


Mass: 832.972 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)

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Sugars , 4 types, 5 molecules

#4: Polysaccharide beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4) ...beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 748.682 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2-2/a4-b1_b4-c1_c4-d1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(4+1)][b-D-Manp]{}}}}LINUCSPDB-CARE
#5: Polysaccharide beta-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4) ...beta-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 748.682 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-6DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2-2/a4-b1_b4-c1_c6-d1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(6+1)][b-D-Manp]{}}}}LINUCSPDB-CARE
#6: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#7: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE / N-Acetylglucosamine


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 3 types, 9 molecules

#8: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Formula: Ca
#9: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
#10: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: complex of integrin alphaIIbbeta3 with eptifibatide / Type: COMPLEX / Entity ID: #1-#3 / Source: MULTIPLE SOURCES
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4 / Details: TBS/1mM CaCl2
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 81000 X / Nominal defocus max: 2200 nm / Nominal defocus min: 1200 nm / Cs: 0.27 mm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 9805
EM imaging opticsEnergyfilter name: GIF Quantum ER / Energyfilter slit width: 10 eV

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.2.1particle selection
4cryoSPARC4.2.1CTF correction
7PHENIX1.20.1model fitting
9cryoSPARC4.2.1initial Euler assignment
10cryoSPARC4.2.1final Euler assignment
11cryoSPARC4.2.1classification
12cryoSPARC4.2.13D reconstruction
19PHENIX1.20.1model refinement
20REFMAC5.8.0267model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 2645177
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 268647 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 2VDN

2vdn


Accession code: 2VDN / Source name: PDB / Type: experimental model
RefinementResolution: 3.1→3.1 Å / Cor.coef. Fo:Fc: 0.913 / SU B: 22.662 / SU ML: 0.378 / ESU R: 0.486
Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES
Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
RfactorNum. reflection% reflection
Rwork0.44997 --
obs0.44997 78210 100 %
Solvent computationSolvent model: PARAMETERS FOR MASK CACLULATION
Displacement parametersBiso mean: 160.273 Å2
Refinement stepCycle: 1 / Total: 6552
Refine LS restraints
Refine-IDTypeDev idealDev ideal targetNumber
ELECTRON MICROSCOPYr_bond_refined_d0.010.0136752
ELECTRON MICROSCOPYr_bond_other_d0.0160.0176155
ELECTRON MICROSCOPYr_angle_refined_deg1.4791.6789135
ELECTRON MICROSCOPYr_angle_other_deg1.3831.60814209
ELECTRON MICROSCOPYr_dihedral_angle_1_deg7.1045820
ELECTRON MICROSCOPYr_dihedral_angle_2_deg33.5822.18344
ELECTRON MICROSCOPYr_dihedral_angle_3_deg18.737151034
ELECTRON MICROSCOPYr_dihedral_angle_4_deg16.61543
ELECTRON MICROSCOPYr_chiral_restr0.0680.2874
ELECTRON MICROSCOPYr_gen_planes_refined0.0080.027593
ELECTRON MICROSCOPYr_gen_planes_other0.0040.021547
ELECTRON MICROSCOPYr_nbd_refined
ELECTRON MICROSCOPYr_nbd_other
ELECTRON MICROSCOPYr_nbtor_refined
ELECTRON MICROSCOPYr_nbtor_other
ELECTRON MICROSCOPYr_xyhbond_nbd_refined
ELECTRON MICROSCOPYr_xyhbond_nbd_other
ELECTRON MICROSCOPYr_metal_ion_refined
ELECTRON MICROSCOPYr_metal_ion_other
ELECTRON MICROSCOPYr_symmetry_vdw_refined
ELECTRON MICROSCOPYr_symmetry_vdw_other
ELECTRON MICROSCOPYr_symmetry_hbond_refined
ELECTRON MICROSCOPYr_symmetry_hbond_other
ELECTRON MICROSCOPYr_symmetry_metal_ion_refined
ELECTRON MICROSCOPYr_symmetry_metal_ion_other
ELECTRON MICROSCOPYr_mcbond_it15.82115.8683300
ELECTRON MICROSCOPYr_mcbond_other15.81715.8663299
ELECTRON MICROSCOPYr_mcangle_it25.31723.7384107
ELECTRON MICROSCOPYr_mcangle_other25.31623.744108
ELECTRON MICROSCOPYr_scbond_it13.33118.3033452
ELECTRON MICROSCOPYr_scbond_other13.3318.3033453
ELECTRON MICROSCOPYr_scangle_it
ELECTRON MICROSCOPYr_scangle_other22.03226.8985029
ELECTRON MICROSCOPYr_long_range_B_refined40.30628348
ELECTRON MICROSCOPYr_long_range_B_other40.30428346
ELECTRON MICROSCOPYr_rigid_bond_restr
ELECTRON MICROSCOPYr_sphericity_free
ELECTRON MICROSCOPYr_sphericity_bonded
LS refinement shellResolution: 3.04→3.119 Å / Total num. of bins used: 20
RfactorNum. reflection% reflection
Rfree0 0 -
Rwork1.102 5720 -
obs--100 %

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