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- PDB-6v4p: Structure of the integrin AlphaIIbBeta3-Abciximab complex -

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Basic information

Entry
Database: PDB / ID: 6v4p
TitleStructure of the integrin AlphaIIbBeta3-Abciximab complex
Components
  • Abciximab, heavy chain
  • Abciximab, light chain
  • Integrin alpha-IIb
  • Integrin beta-3
KeywordsCell Adhesion/Immune System / Integrin / Abciximab / BLOOD CLOTTING / Cell Adhesion-Immune System complex
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 ...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 / integrin alphav-beta3 complex / negative regulation of lipoprotein metabolic process / alphav-beta3 integrin-PKCalpha complex / fibrinogen binding / blood coagulation, fibrin clot formation / alphav-beta3 integrin-HMGB1 complex / 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 / glycinergic synapse / mesodermal cell differentiation / cell-substrate junction assembly / alphav-beta3 integrin-IGF-1-IGF1R complex / platelet-derived growth factor receptor binding / filopodium membrane / extracellular matrix binding / angiogenesis involved in wound healing / 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 / integrin complex / wound healing, spreading of epidermal cells / heterotypic cell-cell adhesion / positive regulation of fibroblast migration / positive regulation of smooth muscle cell migration / 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 / cellular response to insulin-like growth factor stimulus / cell adhesion mediated by integrin / Syndecan interactions / p130Cas linkage to MAPK signaling for integrins / positive regulation of osteoblast proliferation / microvillus membrane / regulation of postsynaptic neurotransmitter receptor internalization / protein disulfide isomerase activity / cell-substrate adhesion / platelet-derived growth factor receptor signaling pathway / PECAM1 interactions / TGF-beta receptor signaling activates SMADs / GRB2:SOS provides linkage to MAPK signaling for Integrins / lamellipodium membrane / fibronectin binding / positive regulation of bone resorption / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / ECM proteoglycans / Integrin cell surface interactions / positive regulation of T cell migration / negative regulation of endothelial cell apoptotic process / coreceptor activity / cellular response to platelet-derived growth factor stimulus / cell adhesion molecule binding / positive regulation of endothelial cell proliferation / Integrin signaling / positive regulation of substrate adhesion-dependent cell spreading / embryo implantation / positive regulation of endothelial cell migration / substrate adhesion-dependent cell spreading / protein kinase C binding / cell-matrix adhesion / Turbulent (oscillatory, disturbed) flow shear stress activates signaling by PIEZO1 and integrins in endothelial cells / Signal transduction by L1 / response to activity / integrin-mediated signaling pathway / positive regulation of smooth muscle cell proliferation / regulation of actin cytoskeleton organization / 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 / platelet aggregation / VEGFA-VEGFR2 Pathway / ruffle membrane / cellular response to mechanical stimulus / positive regulation of angiogenesis / positive regulation of fibroblast proliferation / Signaling by RAF1 mutants
Similarity search - Function
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 alpha Ig-like domain 3 / Integrin beta tail domain ...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 alpha Ig-like domain 3 / Integrin beta tail domain / Integrin EGF domain / Integrin beta subunit, tail / Integrin beta tail domain superfamily / Integrin_B_tail / EGF-like domain, extracellular / EGF-like domain / Integrin alpha cytoplasmic region / Integrins beta chain EGF (I-EGF) domain profile. / 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 / von Willebrand factor, type A domain / 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 alpha, N-terminal / Integrin domain superfamily / 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 / Immunoglobulins / Immunoglobulin-like / Sandwich / Rossmann fold / 3-Layer(aba) Sandwich / Mainly Beta / Alpha Beta
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: 2.8 Å
AuthorsNesic, D. / Zhang, Y. / Spasic, A. / Li, J. / Provasi, D. / Filizola, M. / Walz, T. / Coller, B.S.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)HL19278 United States
National Institutes of Health/National Center for Advancing Translational Sciences (NIH/NCATS)UL1 TR001866 United States
National Science Foundation (NSF, United States)ACI-1053575 United States
CitationJournal: Arterioscler Thromb Vasc Biol / Year: 2020
Title: Cryo-Electron Microscopy Structure of the αIIbβ3-Abciximab Complex.
Authors: Dragana Nešić / Yixiao Zhang / Aleksandar Spasic / Jihong Li / Davide Provasi / Marta Filizola / Thomas Walz / Barry S Coller
Abstract: OBJECTIVE: The αIIbβ3 antagonist antiplatelet drug abciximab is the chimeric antigen-binding fragment comprising the variable regions of murine monoclonal antibody 7E3 and the constant domains of ...OBJECTIVE: The αIIbβ3 antagonist antiplatelet drug abciximab is the chimeric antigen-binding fragment comprising the variable regions of murine monoclonal antibody 7E3 and the constant domains of human IgG1 and light chain κ. Previous mutagenesis studies suggested that abciximab binds to the β3 C177-C184 specificity-determining loop (SDL) and Trp129 on the adjacent β1-α1 helix. These studies could not, however, assess whether 7E3 or abciximab prevents fibrinogen binding by steric interference, disruption of either the αIIbβ3-binding pocket for fibrinogen or the β3 SDL (which is not part of the binding pocket but affects fibrinogen binding), or some combination of these effects. To address this gap, we used cryo-electron microscopy to determine the structure of the αIIbβ3-abciximab complex at 2.8 Å resolution. Approach and Results: The interacting surface of abciximab is comprised of residues from all 3 complementarity-determining regions of both the light and heavy chains, with high representation of aromatic residues. Binding is primarily to the β3 SDL and neighboring residues, the β1-α1 helix, and β3 residues Ser211, Val212 and Met335. Unexpectedly, the structure also indicated several interactions with αIIb. As judged by the cryo-electron microscopy model, molecular-dynamics simulations, and mutagenesis, the binding of abciximab does not appear to rely on the interaction with the αIIb residues and does not result in disruption of the fibrinogen-binding pocket; it does, however, compress and reduce the flexibility of the SDL.
CONCLUSIONS: We deduce that abciximab prevents ligand binding by steric interference, with a potential contribution via displacement of the SDL and limitation of the flexibility of the SDL residues.
History
DepositionNov 28, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 5, 2020Provider: repository / Type: Initial release
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Revision 1.1Feb 12, 2020Group: Source and taxonomy / Category: entity_src_gen
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Revision 1.2Mar 4, 2020Group: Database references / Category: citation / Item: _citation.page_first / _citation.page_last
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Revision 1.4Oct 30, 2024Group: Data collection / Database references / Structure summary
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Structure visualization

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Assembly

Deposited unit
A: Integrin alpha-IIb
B: Integrin beta-3
C: Abciximab, heavy chain
D: Abciximab, light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)228,79711
Polymers228,5324
Non-polymers2657
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
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: 104894.438 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ITGA2B, GP2B, ITGAB / Production host: Homo sapiens (human) / References: UniProt: P08514
#2: Protein Integrin beta-3 / Platelet membrane glycoprotein IIIa / GPIIIa


Mass: 75974.828 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ITGB3, GP3A / Production host: Homo sapiens (human) / References: UniProt: P05106

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Antibody , 2 types, 2 molecules CD

#3: Antibody Abciximab, heavy chain


Mass: 24161.119 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Homo sapiens (human)
#4: Antibody Abciximab, light chain


Mass: 23501.986 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Homo sapiens (human)

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Non-polymers , 2 types, 7 molecules

#5: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: Integrin AlphaIIbBeta3-Abciximab Complex / Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenConc.: 0.1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: NITROGEN

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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
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1161396 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0049937
ELECTRON MICROSCOPYf_angle_d0.55813515
ELECTRON MICROSCOPYf_dihedral_angle_d13.6723584
ELECTRON MICROSCOPYf_chiral_restr0.0441496
ELECTRON MICROSCOPYf_plane_restr0.0041760

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