1SHU | pdb_00001shu

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

• PDB DOI: https://doi.org/10.2210/pdb1SHU/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• 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: 1.50 Å
• R-Value Free: 
  0.215 (Depositor), 0.214 (DCC) 
• R-Value Work: 
  0.187 (Depositor), 0.187 (DCC) 
• R-Value Observed: 
  0.188 (Depositor) 

Starting Model: experimental

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 U S A 101: 6367-6372

• PubMed: 15079089 
• DOI: https://doi.org/10.1073/pnas.0401506101
• Primary Citation Related Structures: 
  1SHT, 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.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 19.92 kDa 
• Atom Count: 1,551 
• Modeled Residue Count: 181 
• Deposited Residue Count: 182 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Anthrax toxin receptor 2	A [auth X]	182	Homo sapiens	Mutation(s): 0  Gene Names: ANTXR2, CMG2
UniProt & NIH Common Fund Data Resources
Find proteins for P58335 (Homo sapiens) Explore P58335  Go to UniProtKB:  P58335
PHAROS:  P58335 GTEx:  ENSG00000163297

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MG	B [auth X]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free:  0.215 (Depositor), 0.214 (DCC) 
• R-Value Work:  0.187 (Depositor), 0.187 (DCC) 
• R-Value Observed: 0.188 (Depositor) 

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 57.419	α = 90
b = 57.419	β = 90
c = 111.459	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• 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
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-23
  Changes: Data collection, Database references, Derived calculations, Refinement description
• Version 1.4: 2024-11-13
  Changes: Structure summary