1AO3 | pdb_00001ao3

A3 DOMAIN OF VON WILLEBRAND FACTOR

• PDB DOI: https://doi.org/10.2210/pdb1AO3/pdb

• Classification: COLLAGEN-BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1997-07-16 Released: 1998-07-22 
• Deposition Author(s): Bienkowski, J., Cruz, M., Handin, R., Liddington, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 
  0.215 (Depositor) 
• R-Value Work: 
  0.158 (Depositor), 0.473 (DCC) 
• R-Value Observed: 
  0.158 (Depositor) 

Literature

The von willebrand factor A3 domain does not contain a metal ion-dependent adhesion site motif.

Bienkowska, J., Cruz, M., Atiemo, A., Handin, R., Liddington, R.

(1997) J Biological Chem 272: 25162-25167

• PubMed: 9312128 
• DOI: https://doi.org/10.1074/jbc.272.40.25162
• Primary Citation Related Structures: 
  1AO3


• PubMed Abstract: 
  

  von Willebrand factor (vWF) is a multimeric plasma protein that mediates platelet adhesion to exposed subendothelium at sites of vascular injury. The A3 domain of vWF (vWF-A3) forms the principal binding site for collagens type I and III. We report here the crystal structure of the vWF-A3 domain at 2.2-A resolution. As expected, the structure is similar to the integrin I domain but with several novel features. Sequence alignments had suggested that the domain contained an integrin metal ion-dependent adhesion site (MIDAS) motif, but the crystal structure shows that the motif is modified and that no metal ion is bound. We have introduced mutations into the vestigial MIDAS motif and report that, unlike the I domain of integrin alpha2beta1, vWF-A3 continues to bind collagen after disruption of the motif. We conclude that collagen recognition by vWF-A3 occurs by a mechanism different from that of the integrin alpha2beta1.

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Organizational Affiliation: 
• Biomedical Engineering Research Center, Boston University, Boston, Massachusetts 02115, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 39.9 kDa 
• Atom Count: 2,971 
• Modeled Residue Count: 374 
• Deposited Residue Count: 374 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
VON WILLEBRAND FACTOR	A, B	187	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P04275 (Homo sapiens) Explore P04275  Go to UniProtKB:  P04275
PHAROS:  P04275 GTEx:  ENSG00000110799

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free:  0.215 (Depositor) 
• R-Value Work:  0.158 (Depositor), 0.473 (DCC) 
• R-Value Observed: 0.158 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58	α = 90
b = 65.1	β = 101.9
c = 57.8	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-07-22 
Deposition Author(s): Bienkowski, J., Cruz, M., Handin, R., Liddington, R.

Revision History  

• Version 1.0: 1998-07-22
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-10-09
  Changes: Data collection, Database references, Structure summary