2VDR image
Entry Detail
PDB ID:
2VDR
Title:
Integrin AlphaIIbBeta3 Headpiece Bound to a chimeric Fibrinogen Gamma chain peptide, LGGAKQRGDV
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2007-10-10
Release Date:
2008-09-02
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.19
R-Value Work:
0.14
R-Value Observed:
0.15
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:INTEGRIN ALPHA-IIB
Chain IDs:A
Chain Length:452
Number of Molecules:1
Biological Source:HOMO SAPIENS
Polymer Type:polypeptide(L)
Description:INTEGRIN BETA-3
Chain IDs:B
Chain Length:461
Number of Molecules:1
Biological Source:HOMO SAPIENS
Polymer Type:polypeptide(L)
Description:FIBRINOGEN
Mutations:YES
Chain IDs:C
Chain Length:10
Number of Molecules:1
Biological Source:HOMO SAPIENS
Polymer Type:polypeptide(L)
Description:MONOCLONAL ANTIBODY 10E5 HEAVY CHAIN
Chain IDs:D (auth: H)
Chain Length:221
Number of Molecules:1
Biological Source:MUS MUSCULUS
Polymer Type:polypeptide(L)
Description:MONOCLONAL ANTIBODY 10E5 LIGHT CHAIN
Chain IDs:E (auth: L)
Chain Length:214
Number of Molecules:1
Biological Source:MUS MUSCULUS
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
Structural Basis for Distinctive Recognition of Fibrinogen Gammac Peptide by the Platelet Integrin Alphaiibbeta3.
J.Cell Biol. 182 791 ? (2008)
PMID: 18710925 DOI: 10.1083/JCB.200801146

Abstact

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.

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