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- PDB-9e8a: Integrin aIIbb3 bent conformation from human platelet membrane cr... -

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Basic information

Entry
Database: PDB / ID: 9e8a
TitleIntegrin aIIbb3 bent conformation from human platelet membrane crude preparation
Components
  • GLY-ARG-GLY-ASP
  • Integrin alpha-IIb
  • Integrin beta-3
KeywordsBLOOD CLOTTING / platelet membrane protein integrin aIIbb3
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 / 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 / mesodermal cell differentiation / glycinergic synapse / cell-substrate junction assembly / alphav-beta3 integrin-IGF-1-IGF1R complex / positive regulation of bone resorption / platelet-derived growth factor receptor binding / filopodium membrane / extracellular matrix binding / negative regulation of low-density lipoprotein particle clearance / angiogenesis involved in wound healing / positive regulation of vascular endothelial growth factor receptor signaling pathway / apolipoprotein A-I-mediated signaling pathway / positive regulation of cell adhesion mediated by integrin / regulation of bone resorption / positive regulation of leukocyte migration / apoptotic cell clearance / wound healing, spreading of epidermal cells / positive regulation of fibroblast migration / integrin complex / positive regulation of smooth muscle cell migration / heterotypic cell-cell adhesion / smooth muscle cell migration / Molecules associated with elastic fibres / negative chemotaxis / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / positive regulation of cell-matrix adhesion / cell adhesion mediated by integrin / Syndecan interactions / p130Cas linkage to MAPK signaling for integrins / positive regulation of osteoblast proliferation / cellular response to insulin-like growth factor stimulus / regulation of postsynaptic neurotransmitter receptor internalization / protein disulfide isomerase activity / microvillus membrane / cell-substrate adhesion / platelet-derived growth factor receptor signaling pathway / PECAM1 interactions / GRB2:SOS provides linkage to MAPK signaling for Integrins / TGF-beta receptor signaling activates SMADs / fibronectin binding / lamellipodium membrane / 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 / cell adhesion molecule binding / cellular response to platelet-derived growth factor stimulus / positive regulation of endothelial cell proliferation / Integrin signaling / embryo implantation / positive regulation of substrate adhesion-dependent cell spreading / positive regulation of smooth muscle cell proliferation / positive regulation of endothelial cell migration / 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 / integrin-mediated signaling pathway / response to activity / regulation of actin cytoskeleton organization / wound healing / cellular response to mechanical stimulus / cell-cell adhesion / Signaling by high-kinase activity BRAF mutants / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / MAP2K and MAPK activation / platelet activation / VEGFA-VEGFR2 Pathway / platelet aggregation / cellular response to xenobiotic stimulus / integrin binding / ruffle membrane / positive regulation of fibroblast proliferation
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 tail domain / Integrin beta cytoplasmic domain / Integrin_b_cyt / : / Integrin alpha Ig-like domain 3 / Integrin EGF domain / Integrin beta subunit, tail ...Integrin beta, epidermal growth factor-like domain 1 / Integrin beta epidermal growth factor like domain 1 / Integrin beta subunit, cytoplasmic domain / Integrin beta tail domain / Integrin beta cytoplasmic domain / Integrin_b_cyt / : / 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 / 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 / Integrin alpha chain, C-terminal cytoplasmic region, conserved site / Integrins alpha chain signature. / Integrin alpha chain / Integrin alpha beta-propellor / : / Integrin alpha Ig-like domain 2 / 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.
Similarity search - Domain/homology
Integrin beta-3 / Integrin alpha-IIb
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.75 Å
AuthorsHan, X. / Nieman, M.T.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)HL098217 United States
CitationJournal: Blood Adv / Year: 2025
Title: Elucidating the dynamics of integrin αIIbβ3 from native platelet membranes by cryo-EM with build-and-retrieve method.
Authors: Xu Han / Zhemin Zhang / Chih-Chia Su / Meinan Lyu / Masaru Miyagi / Edward Yu / Marvin T Nieman
Abstract: Platelets fulfill their essential physiological roles sensing the extracellular environment through their membrane proteins. The native membrane environment provides essential regulatory cues that ...Platelets fulfill their essential physiological roles sensing the extracellular environment through their membrane proteins. The native membrane environment provides essential regulatory cues that affect the protein structure and mechanism of action. Single-particle cryogenic electron microscopy (cryo-EM) has transformed structural biology by allowing high-resolution structures of membrane proteins to be solved from homogeneous samples. Our recent breakthroughs in data processing now make it feasible to obtain atomic-level-resolution protein structures from crude preparations in their native environments by integrating cryo-EM with the "build-and-retrieve" (BaR) data processing methodology. We applied this iterative bottom-up methodology on resting human platelet membranes for an in-depth systems biology approach to uncover how lipids, metal binding, post-translational modifications, and cofactor associations in the native environment regulate platelet function at the molecular level. Here, we report using cryo-EM followed by the BaR method to solve the unmodified integrin αIIbβ3 structure directly from resting human platelet membranes in its inactivated and intermediate states at 2.75 and 2.67 Å, respectively. Furthermore, we also solved a novel dimer conformation of αIIbβ3 at 2.85 Å formed by 2 intermediate states of αIIbβ3. This may indicate a previously unknown self-regulatory mechanism of αIIbβ3 in its native environment. In conclusion, our data show the power of using cryo-EM with the BaR method to determine 3 distinct structures including a novel dimer directly from natural sources. This approach allows us to identify unrecognized regulation mechanisms for proteins without artifacts owing to purification processes. These data have the potential to enrich our understanding of platelet signaling circuitry.
History
DepositionNov 5, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 15, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Integrin alpha-IIb
B: Integrin beta-3
C: GLY-ARG-GLY-ASP
hetero molecules


Theoretical massNumber of molelcules
Total (without water)205,84222
Polymers201,0333
Non-polymers4,80919
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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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: 113477.523 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: 87150.773 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 GLY-ARG-GLY-ASP


Mass: 404.400 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human)

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Sugars , 4 types, 11 molecules

#4: 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.: 4
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
#5: 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
#6: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-beta- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-beta-D-mannopyranose-(1-6)-beta-D-mannopyranose


Type: oligosaccharide / Mass: 748.682 Da / Num. of mol.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-4DManpb1-6DManpb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,4,3/[a1122h-1b_1-5][a2122h-1b_1-5_2*NCC/3=O]/1-1-2-2/a6-b1_b4-c1_c4-d1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-Manp]{[(6+1)][b-D-Manp]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}}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.: 4 / 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 , 2 types, 8 molecules

#7: Chemical
ChemComp-CA / CALCIUM ION


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


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg

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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: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Integrin aIIbb3 / Type: COMPLEX / Entity ID: #1-#3 / Source: NATURAL
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1500 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 36.4 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.75 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 120965 / Symmetry type: POINT

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