2VDN

Re-refinement of Integrin AlphaIIbBeta3 Headpiece Bound to Antagonist Eptifibatide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.166 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

Structural Basis for Distinctive Recognition of Fibrinogen Gammac Peptide by the Platelet Integrin Alphaiibbeta3.

Springer, T.A.Zhu, J.Xiao, T.

(2008) J Cell Biol 182: 791

  • DOI: https://doi.org/10.1083/jcb.200801146
  • Primary Citation of Related Structures:  
    2VC2, 2VDK, 2VDL, 2VDM, 2VDN, 2VDO, 2VDP, 2VDQ, 2VDR

  • PubMed Abstract: 

    Hemostasis and thrombosis (blood clotting) involve fibrinogen binding to integrin alpha(IIb)beta(3) on platelets, resulting in platelet aggregation. alpha(v)beta(3) binds fibrinogen via an Arg-Asp-Gly (RGD) motif in fibrinogen's alpha subunit. alpha(IIb)beta(3) also binds to fibrinogen; however, it does so via an unstructured RGD-lacking C-terminal region of the gamma subunit (gammaC peptide). These distinct modes of fibrinogen binding enable alpha(IIb)beta(3) and alpha(v)beta(3) to function cooperatively in hemostasis. In this study, crystal structures reveal the integrin alpha(IIb)beta(3)-gammaC peptide interface, and, for comparison, integrin alpha(IIb)beta(3) bound to a lamprey gammaC primordial RGD motif. Compared with RGD, the GAKQAGDV motif in gammaC adopts a different backbone configuration and binds over a more extended region. The integrin metal ion-dependent adhesion site (MIDAS) Mg(2+) ion binds the gammaC Asp side chain. The adjacent to MIDAS (ADMIDAS) Ca(2+) ion binds the gammaC C terminus, revealing a contribution for ADMIDAS in ligand binding. Structural data from this natively disordered gammaC peptide enhances our understanding of the involvement of gammaC peptide and integrin alpha(IIb)beta(3) in hemostasis and thrombosis.


  • Organizational Affiliation

    Department of Pathology, Immune Disease Institute, Harvard Medical School, Boston, MA 02115, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
INTEGRIN ALPHA-IIB452Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P08514 (Homo sapiens)
Explore P08514 
Go to UniProtKB:  P08514
PHAROS:  P08514
GTEx:  ENSG00000005961 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08514
Glycosylation
Glycosylation Sites: 2Go to GlyGen: P08514-1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
INTEGRIN BETA-3461Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P05106 (Homo sapiens)
Explore P05106 
Go to UniProtKB:  P05106
PHAROS:  P05106
GTEx:  ENSG00000259207 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05106
Glycosylation
Glycosylation Sites: 3Go to GlyGen: P05106-1
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
EPTIFIBATIDE8synthetic constructMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
MONOCLONAL ANTIBODY 10E5 HEAVY CHAIND [auth H]221Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
MONOCLONAL ANTIBODY 10E5 LIGHT CHAINE [auth L]214Mus musculusMutation(s): 0 
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  • Reference Sequence
Oligosaccharides

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Entity ID: 6
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseF [auth D]5N-Glycosylation
Glycosylation Resources
GlyTouCan:  G21381MC
GlyCosmos:  G21381MC
GlyGen:  G21381MC
Entity ID: 7
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseG [auth E]7N-Glycosylation
Glycosylation Resources
GlyTouCan:  G09609EN
GlyCosmos:  G09609EN
GlyGen:  G09609EN
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
M [auth A],
N [auth A],
S [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
GOL
Query on GOL

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H [auth A],
O [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
CA
Query on CA

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I [auth A]
J [auth A]
K [auth A]
L [auth A]
Q [auth B]
I [auth A],
J [auth A],
K [auth A],
L [auth A],
Q [auth B],
R [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
MG
Query on MG

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P [auth B]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
HRG
Query on HRG
C
L-PEPTIDE LINKINGC7 H16 N4 O2ARG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.166 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 149.593α = 90
b = 149.593β = 90
c = 175.683γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2016-12-28
    Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Other, Source and taxonomy, Structure summary
  • Version 1.3: 2019-01-30
    Changes: Data collection, Experimental preparation, Other
  • Version 1.4: 2019-02-06
    Changes: Data collection, Experimental preparation
  • Version 1.5: 2019-11-20
    Changes: Advisory, Derived calculations, Other
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary