Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 19878.05 
• Atom Count: 1372 
• Residue Count: 181 
• Unique protein chains: 1

1SHT

Crystal Structure of the von Willebrand factor A domain of human capillary morphogenesis protein 2: an anthrax toxin receptor

• DOI: 10.2210/pdb1SHT/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2004-02-26 Released: 2004-04-13 
• Deposition Author(s): Lacy, D.B., Wigelsworth, D.J., Scobie, H.M., Young, J.A.T., Collier, R.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.81 Å
• R-Value Free: 0.186 
• R-Value Work: 0.150 

Literature

Crystal Structure of the von Willebrand factor A domain of human capillary morphogenesis protein 2: an anthrax toxin receptor

Lacy, D.B., Wigelsworth, D.J., Scobie, H.M., Young, J.A.T., Collier, R.J.

(2004) Proc.Natl.Acad.Sci.USA 101: 6367-6372

• PubMed: 15079089 
• DOI: 10.1073/pnas.0401506101
• Primary Citation of Related Structures:  
  1SHU


• PubMed Abstract: 
  

Anthrax toxin is released from Bacillus anthracis as three monomeric proteins, which assemble into toxic complexes at the surface of receptor-bearing host cells. One of the proteins, protective antigen (PA), binds to receptors and orchestrates the delivery of the other two (the lethal and edema factors) into the cytosol. PA has been shown to bind to two cellular receptors: anthrax toxin receptor/tumor endothelial marker 8 and capillary morphogenesis protein 2 (CMG2). Both are type 1 membrane proteins that include an approximately 200-aa extracellular von Willebrand factor A (VWA) domain with a metal ion-dependent adhesion site (MIDAS) motif. The anthrax toxin receptor/tumor endothelial marker 8 and CMG2 VWA domains share approximately 60% amino acid identity and bind PA directly in a metal-dependent manner. Here, we report the crystal structure of the CMG2 VWA domain, with and without its intramolecular disulfide bond, to 1.5 and 1.8 A, respectively. Both structures contain a carboxylate ligand-mimetic bound at the MIDAS and appear as open conformations when compared with the VWA domains from alpha-integrins. The CMG2 structures provide a template to begin probing the high-affinity CMG2-PA interaction (200 pM) and may facilitate understanding of toxin assembly/internalization and the development of new anthrax treatments. The structural data also allow molecular interpretation of known CMG2 VWA domain mutations linked to the genetic disorders, juvenile hyaline fibromatosis, and infantile systemic hyalinosis.

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Organizational Affiliation: 

Department of Microbiology and Molecular Genetics, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Anthrax toxin receptor 2	X	181	Homo sapiens	Mutation(s): 0  Gene Names: ANTXR2 (CMG2)
Find proteins for P58335 (Homo sapiens) Go to Gene View: ANTXR2 Go to UniProtKB:  P58335

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ACT	X	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M
MG	X	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.81 Å
• R-Value Free: 0.186 
• R-Value Work: 0.150 
• Space Group: P 2₁ 3

Unit Cell:

Length (Å)	Angle (°)
a = 79.691	α = 90.00
b = 79.691	β = 90.00
c = 79.691	γ = 90.00

Software Package:

Software Name	Purpose
HKL-2000	data reduction
SCALEPACK	data scaling
REFMAC	refinement
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-02-26 
• Released Date: 2004-04-13 
• Deposition Author(s): Lacy, D.B., Wigelsworth, D.J., Scobie, H.M., Young, J.A.T., Collier, R.J.

Revision History 

• Version 1.0: 2004-04-13
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2014-11-12
  Type: Structure summary