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- EMDB-21044: Cryo-EM structure of the integrin AlphaIIbBeta3-Abciximab complex -

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Basic information

Entry
Database: EMDB / ID: EMD-21044
TitleCryo-EM structure of the integrin AlphaIIbBeta3-Abciximab complex
Map dataintegrin AlphaIIbBeta3-Abciximab complex
Sample
  • Complex: Integrin AlphaIIbBeta3-Abciximab Complex
    • Protein or peptide: Integrin alpha-IIb
    • Protein or peptide: Integrin beta-3
    • Protein or peptide: Abciximab, heavy chain
    • Protein or peptide: Abciximab, light chain
  • Ligand: CALCIUM ION
  • Ligand: MAGNESIUM ION
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 / regulation of extracellular matrix organization / platelet alpha granule membrane / positive regulation of glomerular mesangial cell proliferation ...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 / 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 / maintenance of postsynaptic specialization structure / alphav-beta3 integrin-HMGB1 complex / blood coagulation, fibrin clot formation / negative regulation of lipid transport / vascular endothelial growth factor receptor 2 binding / glycinergic synapse / negative regulation of low-density lipoprotein receptor activity / angiogenesis involved in wound healing / Elastic fibre formation / regulation of release of sequestered calcium ion into cytosol / 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 / regulation of postsynaptic neurotransmitter receptor internalization / positive regulation of fibroblast migration / positive regulation of vascular endothelial growth factor receptor signaling pathway / apolipoprotein A-I-mediated signaling pathway / regulation of bone resorption / apoptotic cell clearance / positive regulation of cell adhesion mediated by integrin / wound healing, spreading of epidermal cells / heterotypic cell-cell adhesion / integrin complex / Molecules associated with elastic fibres / positive regulation of leukocyte migration / positive regulation of cell-matrix adhesion / cellular response to insulin-like growth factor stimulus / smooth muscle cell migration / microvillus membrane / negative chemotaxis / cell adhesion mediated by integrin / Syndecan interactions / p130Cas linkage to MAPK signaling for integrins / activation of protein kinase activity / cellular response to platelet-derived growth factor stimulus / cell-substrate adhesion / protein disulfide isomerase activity / positive regulation of smooth muscle cell migration / 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 / platelet-derived growth factor receptor signaling pathway / negative regulation of lipid storage / fibronectin binding / ECM proteoglycans / positive regulation of T cell migration / positive regulation of bone resorption / Integrin cell surface interactions / coreceptor activity / negative regulation of endothelial cell apoptotic process / positive regulation of substrate adhesion-dependent cell spreading / cell adhesion molecule binding / positive regulation of endothelial cell proliferation / embryo implantation / positive regulation of endothelial cell migration / Integrin signaling / substrate adhesion-dependent cell spreading / cell-matrix adhesion / response to activity / Signal transduction by L1 / integrin-mediated signaling pathway / regulation of actin cytoskeleton organization / protein kinase C binding / positive regulation of smooth muscle cell proliferation / Signaling by high-kinase activity BRAF mutants / wound healing / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / MAP2K and MAPK activation / platelet activation / platelet aggregation / ruffle membrane / VEGFA-VEGFR2 Pathway / cell-cell adhesion / 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 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 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)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsNesic D / Zhang Y / Spasic A / Li J / Provasi D / Filizola M / Walz T / Coller BS
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)HL19278 United States
National Science Foundation (NSF, United States)ACI-1053575 United States
National Institutes of Health/National Center for Advancing Translational Sciences (NIH/NCATS)UL1 TR001866 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, 2019-
Header (metadata) releaseJan 15, 2020-
Map releaseFeb 5, 2020-
UpdateMar 11, 2020-
Current statusMar 11, 2020Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6v4p
  • Surface level: 0.05
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21044.png

Downloads & links

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Map

FileDownload / File: emd_21044.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationintegrin AlphaIIbBeta3-Abciximab complex
Voxel sizeX=Y=Z: 1 Å
Density
Contour LevelBy AUTHOR: 0.05 / Movie #1: 0.05
Minimum - Maximum-0.49234912 - 0.77833647
Average (Standard dev.)-0.00000308856 (±0.0117775705)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 288.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z111
M x/y/z288288288
origin x/y/z0.0000.0000.000
length x/y/z288.000288.000288.000
α/β/γ90.00090.00090.000
start NX/NY/NZ29921935
NX/NY/NZ271234450
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS288288288
D min/max/mean-0.4920.778-0.000

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Supplemental data

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Sample components

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Entire : Integrin AlphaIIbBeta3-Abciximab Complex

EntireName: Integrin AlphaIIbBeta3-Abciximab Complex
Components
  • Complex: Integrin AlphaIIbBeta3-Abciximab Complex
    • Protein or peptide: Integrin alpha-IIb
    • Protein or peptide: Integrin beta-3
    • Protein or peptide: Abciximab, heavy chain
    • Protein or peptide: Abciximab, light chain
  • Ligand: CALCIUM ION
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Integrin AlphaIIbBeta3-Abciximab Complex

SupramoleculeName: Integrin AlphaIIbBeta3-Abciximab Complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Homo sapiens (human)

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Macromolecule #1: Integrin alpha-IIb

MacromoleculeName: Integrin alpha-IIb / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 104.894438 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MARALCPLQA LWLLEWVLLL LGPCAAPPAW ALNLDPVQLT FYAGPNGSQF GFSLDFHKDS HGRVAIVVGA PRTLGPSQEE TGGVFLCPW RAEGGQCPSL LFDLRDETRN VGSQTLQTFK ARQGLGASVV SWSDVIVACA PWQHWNVLEK TEEAEKTPVG S CFLAQPES ...String:
MARALCPLQA LWLLEWVLLL LGPCAAPPAW ALNLDPVQLT FYAGPNGSQF GFSLDFHKDS HGRVAIVVGA PRTLGPSQEE TGGVFLCPW RAEGGQCPSL LFDLRDETRN VGSQTLQTFK ARQGLGASVV SWSDVIVACA PWQHWNVLEK TEEAEKTPVG S CFLAQPES GRRAEYSPCR GNTLSRIYVE NDFSWDKRYC EAGFSSVVTQ AGELVLGAPG GYYFLGLLAQ APVADIFSSY RP GILLWHV SSQSLSFDSS NPEYFDGYWG YSVAVGEFDG DLNTTEYVVG APTWSWTLGA VEILDSYYQR LHRLRGEQMA SYF GHSVAV TDVNGDGRHD LLVGAPLYME SRADRKLAEV GRVYLFLQPR GPHALGAPSL LLTGTQLYGR FGSAIAPLGD LDRD GYNDI AVAAPYGGPS GRGQVLVFLG QSEGLRSRPS QVLDSPFPTG SAFGFSLRGA VDIDDNGYPD LIVGAYGANQ VAVYR AQPV VKASVQLLVQ DSLNPAVKSC VLPQTKTPVS CFNIQMCVGA TGHNIPQKLS LNAELQLDRQ KPRQGRRVLL LGSQQA GTT LNLDLGGKHS PICHTTMAFL RDEADFRDKL SPIVLSLNVS LPPTEAGMAP AVVLHGDTHV QEQTRIVLDC GEDDVCV PQ LQLTASVTGS PLLVGADNVL ELQMDAANEG EGAYEAELAV HLPQGAHYMR ALSNVEGFER LICNQKKENE TRVVLCEL G NPMKKNAQIG IAMLVSVGNL EEAGESVSFQ LQIRSKNSQN PNSKIVLLDV PVRAEAQVEL RGNSFPASLV VAAEEGERE QNSLDSWGPK VEHTYELHNN GPGTVNGLHL SIHLPGQSQP SDLLYILDIQ PQGGLQCFPQ PPVNPLKVDW GLPIPSPSPI HPAHHKRDR RQIFLPEPEQ PSRLQDPVLV SCDSAPCTVV QCDLQEMARG QRAMVTVLAF LWLPSLYQRP LDQFVLQSHA W FNV

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Macromolecule #2: Integrin beta-3

MacromoleculeName: Integrin beta-3 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 75.974828 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MRARPRPRPL WATVLALGAL AGVGVGGPNI CTTRGVSSCQ QCLAVSPMCA WCSDEALPLG SPRCDLKENL LKDNCAPESI EFPVSEARV LEDRPLSDKG SGDSSQVTQV SPQRIALRLR PDDSKNFSIQ VRQVEDYPVD IYYLMDLSYS MKDDLWSIQN L GTKLATQM ...String:
MRARPRPRPL WATVLALGAL AGVGVGGPNI CTTRGVSSCQ QCLAVSPMCA WCSDEALPLG SPRCDLKENL LKDNCAPESI EFPVSEARV LEDRPLSDKG SGDSSQVTQV SPQRIALRLR PDDSKNFSIQ VRQVEDYPVD IYYLMDLSYS MKDDLWSIQN L GTKLATQM RKLTSNLRIG FGAFVDKPVS PYMYISPPEA LENPCYDMKT TCLPMFGYKH VLTLTDQVTR FNEEVKKQSV SR NRDAPEG GFDAIMQATV CDEKIGWRND ASHLLVFTTD AKTHIALDGR LAGIVQPNDG QCHVGSDNHY SASTTMDYPS LGL MTEKLS QKNINLIFAV TENVVNLYQN YSELIPGTTV GVLSMDSSNV LQLIVDAYGK IRSKVELEVR DLPEELSLSF NATC LNNEV IPGLKSCMGL KIGDTVSFSI EAKVRGCPQE KEKSFTIKPV GFKDSLIVQV TFDCDCACQA QAEPNSHRCN NGNGT FECG VCRCGPGWLG SQCECSEEDY RPSQQDECSP REGQPVCSQR GECLCGQCVC HSSDFGKITG KYCECDDFSC VRYKGE MCS GHGQCSCGDC LCDSDWTGYY CNCTTRTDTC MSSNGLLCSG RGKCECGSCV CIQPGSYGDT CEKCPTCPDA CTFKKEC VE CKKFDRGALH DENTCNRYCR DEIESVKELK DTGKDAVNCT YKNEDDCV

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Macromolecule #3: Abciximab, heavy chain

MacromoleculeName: Abciximab, heavy chain / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 24.161119 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: EVQLQQSGTV LARPGASVKM SCEASGYTFT NYWMHWVKQR PGQGLEWIGA IYPGNSDTSY IQKFKGKAKL TAVTSTTSVY MELSSLTNE DSAVYYCTLY DGYYVFAYWG QGTLVTVSAA STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW N SGALTSGV ...String:
EVQLQQSGTV LARPGASVKM SCEASGYTFT NYWMHWVKQR PGQGLEWIGA IYPGNSDTSY IQKFKGKAKL TAVTSTTSVY MELSSLTNE DSAVYYCTLY DGYYVFAYWG QGTLVTVSAA STKGPSVFPL APSSKSTSGG TAALGCLVKD YFPEPVTVSW N SGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT YICNVNHKPS NTKVDKKVEP KSCDKTH

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Macromolecule #4: Abciximab, light chain

MacromoleculeName: Abciximab, light chain / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 23.501986 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: EIVLTQSPVT LSVTPGDSVS LSCRASRDIS NNLHWFQQTS HESPRLLIKY ASQSMSGIPS RFSGSGSGTD FTLSINSVET EDFGMYFCQ QTNSWPYTFG GGTKLEIKRT VAAPSVFIFP PSDEQLKSGT ASVVCLLNNF YPREAKVQWK VDNALQSGNS Q ESVTEQDS ...String:
EIVLTQSPVT LSVTPGDSVS LSCRASRDIS NNLHWFQQTS HESPRLLIKY ASQSMSGIPS RFSGSGSGTD FTLSINSVET EDFGMYFCQ QTNSWPYTFG GGTKLEIKRT VAAPSVFIFP PSDEQLKSGT ASVVCLLNNF YPREAKVQWK VDNALQSGNS Q ESVTEQDS KDSTYSLSST LTLSKADYEK HKVYACEVTH QGLSSPVTKS FNRGEC

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Macromolecule #5: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 5 / Number of copies: 6 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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Macromolecule #6: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 6 / Number of copies: 1 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.1 mg/mL
BufferpH: 7.4
VitrificationCryogen name: NITROGEN

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 1161396
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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