1FE8 image
Deposition Date 2000-07-21
Release Date 2001-04-04
Last Version Date 2024-10-16
Entry Detail
PDB ID:
1FE8
Keywords:
Title:
CRYSTAL STRUCTURE OF THE VON WILLEBRAND FACTOR A3 DOMAIN IN COMPLEX WITH A FAB FRAGMENT OF IGG RU5 THAT INHIBITS COLLAGEN BINDING
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Mus musculus (Taxon ID: 10090)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.03 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:VON WILLEBRAND FACTOR
Gene (Uniprot):VWF
Chain IDs:A, D (auth: B), G (auth: C)
Chain Length:196
Number of Molecules:3
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:IMMUNOGLOBULIN IGG RU5
Chain IDs:B (auth: H), E (auth: I), H (auth: J)
Chain Length:210
Number of Molecules:3
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:IMMUNOGLOBULIN IGG RU5
Chain IDs:C (auth: L), F (auth: M), I (auth: N)
Chain Length:211
Number of Molecules:3
Biological Source:Mus musculus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN B ASN GLYCOSYLATION SITE
MSE A MET SELENOMETHIONINE
Primary Citation

Abstact

Von Willebrand factor (vWF) is a multimeric glycoprotein that mediates platelet adhesion and thrombus formation at sites of vascular injury. vWF functions as a molecular bridge between collagen and platelet receptor glycoprotein Ib. The major collagen-binding site of vWF is contained within the A3 domain, but its precise location is unknown. To localize the collagen-binding site, we determined the crystal structure of A3 in complex with an Fab fragment of antibody RU5 that inhibits collagen binding. The structure shows that RU5 recognizes a nonlinear epitope consisting of residues 962-966, 981-997, and 1022-1026. Alanine mutants were constructed of residues Arg(963), Glu(987), His(990), Arg(1016), and His(1023), located in or close to the epitope. Mutants were expressed as fully processed multimeric vWF. Mutation of His(1023) abolished collagen binding, whereas mutation of Arg(963) and Arg(1016) reduced collagen binding by 25-35%. These residues are part of loops alpha3beta4 and alpha1beta2 and alpha-helix 3, respectively, and lie near the bottom face of the domain. His(1023) and flanking residues display multiple conformations in available A3-crystal structures, suggesting that binding of A3 to collagen involves an induced-fit mechanism. The collagen-binding site of A3 is located distant from the top face of the domain where collagen-binding sites are found in homologous integrin I domains.

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Primary Citation of related structures