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- PDB-8t2v: Cryo-EM Structures of Full-length Integrin alphaIIbbeta3 in Nativ... -

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Basic information

Entry
Database: PDB / ID: 8t2v
TitleCryo-EM Structures of Full-length Integrin alphaIIbbeta3 in Native Lipids
Components
  • Integrin alpha-IIb
  • Integrin 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 / integrin alphaIIb-beta3 complex / regulation of postsynaptic neurotransmitter receptor diffusion trapping / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization ...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 / integrin alphaIIb-beta3 complex / regulation of postsynaptic neurotransmitter receptor diffusion trapping / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-vitronectin complex / regulation of extracellular matrix organization / positive regulation of glomerular mesangial cell proliferation / platelet alpha granule membrane / negative regulation of lipoprotein metabolic process / integrin alphav-beta3 complex / alphav-beta3 integrin-PKCalpha complex / fibrinogen binding / alphav-beta3 integrin-HMGB1 complex / blood coagulation, fibrin clot formation / glycinergic synapse / vascular endothelial growth factor receptor 2 binding / negative regulation of lipid transport / positive regulation of vascular endothelial growth factor signaling pathway / : / regulation of release of sequestered calcium ion into cytosol / Elastic fibre formation / mesodermal cell differentiation / cell-substrate junction assembly / alphav-beta3 integrin-IGF-1-IGF1R complex / platelet-derived growth factor receptor binding / angiogenesis involved in wound healing / filopodium membrane / extracellular matrix binding / positive regulation of fibroblast migration / positive regulation of vascular endothelial growth factor receptor signaling pathway / regulation of bone resorption / apolipoprotein A-I-mediated signaling pathway / positive regulation of cell adhesion mediated by integrin / positive regulation of leukocyte migration / apoptotic cell clearance / wound healing, spreading of epidermal cells / integrin complex / heterotypic cell-cell adhesion / smooth muscle cell migration / Molecules associated with elastic fibres / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / positive regulation of cell-matrix adhesion / negative chemotaxis / cell adhesion mediated by integrin / cellular response to insulin-like growth factor stimulus / Syndecan interactions / microvillus membrane / p130Cas linkage to MAPK signaling for integrins / positive regulation of smooth muscle cell migration / regulation of postsynaptic neurotransmitter receptor internalization / protein disulfide isomerase activity / cell-substrate adhesion / positive regulation of osteoblast proliferation / PECAM1 interactions / TGF-beta receptor signaling activates SMADs / GRB2:SOS provides linkage to MAPK signaling for Integrins / lamellipodium membrane / platelet-derived growth factor receptor signaling pathway / fibronectin binding / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / ECM proteoglycans / Integrin cell surface interactions / positive regulation of bone resorption / positive regulation of T cell migration / negative regulation of endothelial cell apoptotic process / coreceptor activity / cell adhesion molecule binding / cellular response to platelet-derived growth factor stimulus / positive regulation of endothelial cell proliferation / positive regulation of substrate adhesion-dependent cell spreading / positive regulation of endothelial cell migration / Integrin signaling / embryo implantation / substrate adhesion-dependent cell spreading / protein kinase C binding / Turbulent (oscillatory, disturbed) flow shear stress activates signaling by PIEZO1 and integrins in endothelial cells / cell-matrix adhesion / Signal transduction by L1 / response to activity / integrin-mediated signaling pathway / regulation of actin cytoskeleton organization / positive regulation of smooth muscle cell proliferation / wound healing / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / Signaling by high-kinase activity BRAF mutants / MAP2K and MAPK activation / cell-cell adhesion / platelet activation / VEGFA-VEGFR2 Pathway / platelet aggregation / ruffle membrane / cellular response to mechanical stimulus / positive regulation of fibroblast proliferation / positive regulation of angiogenesis / Signaling by RAF1 mutants
Similarity search - Function
ntegrin, alpha v. Chain A, domain 4 / Integrin domains. Chain A, domain 2 / ntegrin, alpha v. Chain A, domain 3 / Integrin alpha, N-terminal / 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 beta tail domain ...ntegrin, alpha v. Chain A, domain 4 / Integrin domains. Chain A, domain 2 / ntegrin, alpha v. Chain A, domain 3 / Integrin alpha, N-terminal / 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 beta tail domain / : / Integrin alpha Ig-like domain 3 / Integrin EGF domain / Integrin beta subunit, tail / Integrin beta tail domain superfamily / Integrin_B_tail / EGF-like domain, extracellular / EGF-like domain / Integrins beta chain EGF (I-EGF) domain profile. / Integrin alpha cytoplasmic region / Integrin beta subunit, VWA domain / Integrin beta subunit / Integrin beta N-terminal / Integrin beta chain VWA domain / Integrin plexin domain / Integrins beta chain EGF (I-EGF) domain signature. / Integrin beta subunits (N-terminal portion of extracellular region) / Integrin alpha-2 / Integrin alpha Ig-like domain 1 / Integrin alpha chain / Integrin alpha beta-propellor / Integrin alpha chain, C-terminal cytoplasmic region, conserved site / : / Integrin alpha Ig-like domain 2 / 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 1. / EGF-like domain signature 2. / 7 Propeller / Methylamine Dehydrogenase; Chain H / Immunoglobulin-like / Sandwich / Mainly Beta
Similarity search - Domain/homology
CHOLESTEROL / Integrin beta-3 / Integrin alpha-IIb
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 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
Revision 2.0May 1, 2024Group: Advisory / Atomic model ...Advisory / Atomic model / Data collection / Derived calculations / Refinement description / Structure summary
Category: atom_site / atom_type ...atom_site / atom_type / chem_comp_atom / chem_comp_bond / em_3d_fitting_list / em_software / entity / pdbx_branch_scheme / pdbx_contact_author / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_nonpoly_scheme / pdbx_struct_conn_angle / pdbx_struct_sheet_hbond / pdbx_validate_close_contact / pdbx_validate_torsion / struct_asym / struct_conf / struct_conn / struct_mon_prot_cis / struct_sheet / struct_sheet_order / struct_sheet_range
Item: _em_3d_fitting_list.initial_refinement_model_id / _entity.formula_weight ..._em_3d_fitting_list.initial_refinement_model_id / _entity.formula_weight / _entity.pdbx_description / _entity.pdbx_number_of_molecules / _pdbx_entity_branch_descriptor.descriptor / _pdbx_entity_branch_link.atom_id_2 / _pdbx_entity_branch_link.comp_id_1 / _pdbx_entity_branch_link.comp_id_2 / _pdbx_entity_branch_link.entity_branch_list_num_1 / _pdbx_entity_branch_link.entity_branch_list_num_2 / _pdbx_entity_branch_link.entity_id / _pdbx_entity_branch_link.leaving_atom_id_2 / _pdbx_entity_branch_list.comp_id / _pdbx_entity_branch_list.entity_id / _pdbx_entity_branch_list.num / _struct_asym.entity_id / _struct_mon_prot_cis.pdbx_omega_angle
Description: Atomic clashes / Provider: author / Type: Coordinate replacement
Revision 2.1Oct 30, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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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
hetero molecules


Theoretical massNumber of molelcules
Total (without water)200,24723
Polymers194,5852
Non-polymers5,66221
Water1086
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 / 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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Sugars , 5 types, 11 molecules

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


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE
#4: Polysaccharide beta-D-mannopyranose-(1-3)-[beta-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2- ...beta-D-mannopyranose-(1-3)-[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: 910.823 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-3[DManpb1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2-2-2/a4-b1_b4-c1_c3-d1_c6-e1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][b-D-Manp]{}[(6+1)][b-D-Manp]{}}}}LINUCSPDB-CARE
#5: 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
#6: 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
#8: 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


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 6 / Source method: obtained synthetically / 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 , 4 types, 16 molecules

#7: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: Ca
#9: Chemical ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C27H46O
#10: Chemical ChemComp-MG / MAGNESIUM ION


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


Mass: 18.015 Da / Num. of mol.: 6 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestN
Has protein modificationY

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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: full length integrin alphaIIbbeta3 / Type: COMPLEX / Entity ID: #1-#2 / Source: NATURAL
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
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 FIELD / Nominal magnification: 81000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Cs: 0.27 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 11947
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
8UCSF Chimera1.15model fitting
10PHENIX1.20.1model refinement
11REFMAC5.8.0267model refinement
14cryoSPARC4.2.1classification
15cryoSPARC4.2.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 4477836
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 117126 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
13FCS

3fcs

13FCS1PDBexperimental model
22K9J

2k9j

12K9J2PDBexperimental model
RefinementResolution: 3.4→3.4 Å / Cor.coef. Fo:Fc: 0.955 / SU B: 20.525 / SU ML: 0.302 / ESU R: 0.403
Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES
Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
RfactorNum. reflection% reflection
Rwork0.31912 --
obs0.31912 146780 100 %
Solvent computationSolvent model: PARAMETERS FOR MASK CACLULATION
Displacement parametersBiso mean: 188.941 Å2
Refinement stepCycle: 1 / Total: 13128
Refine LS restraints
Refine-IDTypeDev idealDev ideal targetNumber
ELECTRON MICROSCOPYr_bond_refined_d0.0110.01313501
ELECTRON MICROSCOPYr_bond_other_d0.0150.01712431
ELECTRON MICROSCOPYr_angle_refined_deg1.7131.67418354
ELECTRON MICROSCOPYr_angle_other_deg1.4091.60528785
ELECTRON MICROSCOPYr_dihedral_angle_1_deg7.51751659
ELECTRON MICROSCOPYr_dihedral_angle_2_deg34.02722.866656
ELECTRON MICROSCOPYr_dihedral_angle_3_deg18.57152130
ELECTRON MICROSCOPYr_dihedral_angle_4_deg16.521577
ELECTRON MICROSCOPYr_chiral_restr0.0710.21778
ELECTRON MICROSCOPYr_gen_planes_refined0.0070.0215128
ELECTRON MICROSCOPYr_gen_planes_other0.0030.022934
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_it18.83619.0196656
ELECTRON MICROSCOPYr_mcbond_other18.75319.0186653
ELECTRON MICROSCOPYr_mcangle_it27.37128.4278298
ELECTRON MICROSCOPYr_mcangle_other27.36928.438299
ELECTRON MICROSCOPYr_scbond_it18.01321.326845
ELECTRON MICROSCOPYr_scbond_other18.01221.3216846
ELECTRON MICROSCOPYr_scangle_it
ELECTRON MICROSCOPYr_scangle_other27.4431.34210056
ELECTRON MICROSCOPYr_long_range_B_refined40.0652643
ELECTRON MICROSCOPYr_long_range_B_other40.0652644
ELECTRON MICROSCOPYr_rigid_bond_restr
ELECTRON MICROSCOPYr_sphericity_free
ELECTRON MICROSCOPYr_sphericity_bonded
LS refinement shellResolution: 3.38→3.468 Å / Total num. of bins used: 20
RfactorNum. reflection% reflection
Rfree0 0 -
Rwork1.279 10808 -
obs--100 %

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