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- EMDB-23245: Integrin AlphaIIbBeta3-PT25-2 Complex -

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Basic information

Entry
Database: EMDB / ID: EMD-23245
TitleIntegrin AlphaIIbBeta3-PT25-2 Complex
Map dataCryo-EM map of Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound
Sample
  • Cell: Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound
    • Cell: PT25-2 heavy and light chains
      • Protein or peptide: PT25-2 heavy chain
      • Protein or peptide: PT25-2 light chain
    • Cell: aIIBb3 integrin headpiece
      • Protein or peptide: Integrin alpha-IIb
      • Protein or peptide: Integrin beta-3
  • Ligand: CALCIUM ION
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: MAGNESIUM ION
  • Ligand: water
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 speciesMus musculus (house mouse) / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsBush MW / Walz T / Coller B / Filizola M / Spasic A / Nesic D / Li J
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)2R01HL019278-43 United States
CitationJournal: Blood Adv / Year: 2021
Title: Electron microscopy shows that binding of monoclonal antibody PT25-2 primes integrin αIIbβ3 for ligand binding.
Authors: Dragana Nešić / Martin Bush / Aleksandar Spasic / Jihong Li / Tetsuji Kamata / Makoto Handa / Marta Filizola / Thomas Walz / Barry S Coller /
Abstract: The murine monoclonal antibody (mAb) PT25-2 induces αIIbβ3 to bind ligand and initiate platelet aggregation. The underlying mechanism is unclear, because previous mutagenesis studies suggested that ...The murine monoclonal antibody (mAb) PT25-2 induces αIIbβ3 to bind ligand and initiate platelet aggregation. The underlying mechanism is unclear, because previous mutagenesis studies suggested that PT25-2 binds to the αIIb β propeller, a site distant from the Arg-Gly-Asp-binding pocket. To elucidate the mechanism, we studied the αIIbβ3-PT25-2 Fab complex by negative-stain and cryo-electron microscopy (EM). We found that PT25-2 binding results in αIIbβ3 partially exposing multiple ligand-induced binding site epitopes and adopting extended conformations without swing-out of the β3 hybrid domain. The cryo-EM structure showed PT25-2 binding to the αIIb residues identified by mutagenesis but also to 2 additional regions. Overlay of the cryo-EM structure with the bent αIIbβ3 crystal structure showed that binding of PT25-2 creates clashes with the αIIb calf-1/calf-2 domains, suggesting that PT25-2 selectively binds to partially or fully extended receptor conformations and prevents a return to its bent conformation. Kinetic studies of the binding of PT25-2 compared with mAbs 10E5 and 7E3 support this hypothesis. We conclude that PT25-2 induces αIIbβ3 ligand binding by binding to extended conformations and by preventing the interactions between the αIIb and β3 leg domains and subsequently the βI and β3 leg domains required for the bent-closed conformation.
History
DepositionJan 5, 2021-
Header (metadata) releaseJan 12, 2022-
Map releaseJan 12, 2022-
UpdateJul 27, 2022-
Current statusJul 27, 2022Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0327
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.0327
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7la4
  • Surface level: 0.0327
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_23245.png

Downloads & links

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Map

FileDownload / File: emd_23245.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM map of Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound
Voxel sizeX=Y=Z: 1 Å
Density
Contour LevelBy AUTHOR: 0.0327 / Movie #1: 0.0327
Minimum - Maximum-0.08840799 - 0.14500299
Average (Standard dev.)-2.3690131e-07 (±0.0025907082)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 320.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z111
M x/y/z320320320
origin x/y/z0.0000.0000.000
length x/y/z320.000320.000320.000
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS320320320
D min/max/mean-0.0880.145-0.000

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Supplemental data

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Sample components

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Entire : Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound

EntireName: Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound
Components
  • Cell: Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound
    • Cell: PT25-2 heavy and light chains
      • Protein or peptide: PT25-2 heavy chain
      • Protein or peptide: PT25-2 light chain
    • Cell: aIIBb3 integrin headpiece
      • Protein or peptide: Integrin alpha-IIb
      • Protein or peptide: Integrin beta-3
  • Ligand: CALCIUM ION
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: MAGNESIUM ION
  • Ligand: water

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Supramolecule #1: Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound

SupramoleculeName: Human aIIBb3 integrin headpiece with PT25-2 antibody fragment bound
type: cell / ID: 1 / Parent: 0 / Macromolecule list: #1-#4

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Supramolecule #2: PT25-2 heavy and light chains

SupramoleculeName: PT25-2 heavy and light chains / type: cell / ID: 2 / Parent: 1 / Macromolecule list: #1-#2
Source (natural)Organism: Mus musculus (house mouse)

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Supramolecule #3: aIIBb3 integrin headpiece

SupramoleculeName: aIIBb3 integrin headpiece / type: cell / ID: 3 / Parent: 1 / Macromolecule list: #3-#4
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: PT25-2 heavy chain

MacromoleculeName: PT25-2 heavy chain / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 23.079824 KDa
Recombinant expressionOrganism: Mus musculus (house mouse)
SequenceString: EVLLQQSGPE LVKPGASVKI PCKTSGYTFT DSNMDWVKQS HGKSLEWIGD INPNNGGTLY NQKFKDKATL TIDKSSSTAY MELRTLTSE DTAVYYCTRS YYGRFDYWGQ GTALTVSSAK TTPPSVYPLA PGSAAQTNSM VTLGCLVKGY FPEPVTVTWN S GSLSSGVH ...String:
EVLLQQSGPE LVKPGASVKI PCKTSGYTFT DSNMDWVKQS HGKSLEWIGD INPNNGGTLY NQKFKDKATL TIDKSSSTAY MELRTLTSE DTAVYYCTRS YYGRFDYWGQ GTALTVSSAK TTPPSVYPLA PGSAAQTNSM VTLGCLVKGY FPEPVTVTWN S GSLSSGVH TFPAVLQSDL YTLSSSVTVP SSPRPSETVT CNVAHPASST KVDKKI

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Macromolecule #2: PT25-2 light chain

MacromoleculeName: PT25-2 light chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 23.636932 KDa
Recombinant expressionOrganism: Mus musculus (house mouse)
SequenceString: DIQMTQTTSS LSASLGDRVT ISCRASQDIS NYLNWYQQKS DGTVKLLIYY TSRLHSGVPS RFSGSGSGTD YSLTISNLEQ EDIATYFCQ QGNTLPPTFG GGTKLEIKRA DAAPTVSIFP PSSEQLTSGG ASVVCFLNNF YPKDINVKWK IDGSERQNGV L NSWTDQDS ...String:
DIQMTQTTSS LSASLGDRVT ISCRASQDIS NYLNWYQQKS DGTVKLLIYY TSRLHSGVPS RFSGSGSGTD YSLTISNLEQ EDIATYFCQ QGNTLPPTFG GGTKLEIKRA DAAPTVSIFP PSSEQLTSGG ASVVCFLNNF YPKDINVKWK IDGSERQNGV L NSWTDQDS KDSTYSMSST LTLTKDEYER HNSYTCEATH KTSTSPIVKS FNRNEC

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Macromolecule #3: Integrin alpha-IIb

MacromoleculeName: Integrin alpha-IIb / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 113.477523 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 FNVSSLPY AVPPLSLPRG EAQVWTQLLR ALEERAIPIW WVLVGVLGGL LLLTILVLAM WKVGFFKRNR PPLEEDDEEG E

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Macromolecule #4: Integrin beta-3

MacromoleculeName: Integrin beta-3 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 87.150773 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 YKNEDDCVVR FQYYEDSSGK SILYVVEEPE CPKGPDIL V VLLSVMGAIL LIGLAALLIW KLLITIHDRK EFAKFEEERA RAKWDTANNP LYKEATSTFT NITYRGT

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Macromolecule #8: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 8 / Number of copies: 6 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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Macromolecule #9: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 9 / Number of copies: 1 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #10: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 10 / Number of copies: 1 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #11: water

MacromoleculeName: water / type: ligand / ID: 11 / Number of copies: 4 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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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

BufferpH: 7.4
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 80.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 166124
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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