Biological Assembly 1  

 3D View: Structure | Electron Density

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 5-mer - A2BCD Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 5-mer -A2B2C 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 115198.31 
• Atom Count: 7807 
• Residue Count: 1053 
• Unique protein chains: 5

4KI5

Cystal structure of human factor VIII C2 domain in a ternary complex with murine inhbitory antibodies 3E6 and G99

• DOI: 10.2210/pdb4KI5/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2013-05-01 Released: 2014-01-15 
• Deposition Author(s): Walter, J.D., Meeks, S.L., Healey, J.F., Lollar, P., Spiegel, P.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.47 Å
• R-Value Free: 0.238 
• R-Value Work: 0.188 

Literature

Structure of the factor VIII C2 domain in a ternary complex with 2 inhibitor antibodies reveals classical and nonclassical epitopes.

Walter, J.D., Werther, R.A., Brison, C.M., Cragerud, R.K., Healey, J.F., Meeks, S.L., Lollar, P., Spiegel, P.C.

(2013) Blood 122: 4270-4278

• PubMed: 24085769 
• DOI: 10.1182/blood-2013-08-519124


• PubMed Abstract: 
  

The factor VIII C2 domain is a highly immunogenic domain, whereby inhibitory antibodies develop following factor VIII replacement therapy for congenital hemophilia A patients. Inhibitory antibodies also arise spontaneously in cases of acquired hemophilia A. The structural basis for molecular recognition by 2 classes of anti-C2 inhibitory antibodies that bind to factor VIII simultaneously was investigated by x-ray crystallography. The C2 domain/3E6 FAB/G99 FAB ternary complex illustrates that each antibody recognizes epitopes on opposing faces of the factor VIII C2 domain. The 3E6 epitope forms direct contacts to the C2 domain at 2 loops consisting of Glu2181-Ala2188 and Thr2202-Arg2215, whereas the G99 epitope centers on Lys2227 and also makes direct contacts with loops Gln2222-Trp2229, Leu2261-Ser2263, His2269-Val2282, and Arg2307-Gln2311. Each binding interface is highly electrostatic, with positive charge present on both C2 epitopes and complementary negative charge on each antibody. A new model of membrane association is also presented, where the 3E6 epitope faces the negatively charged membrane surface and Arg2320 is poised at the center of the binding interface. These results illustrate the potential complexities of the polyclonal anti-factor VIII immune response and further define the "classical" and "nonclassical" types of antibody inhibitors against the factor VIII C2 domain.

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Organizational Affiliation: 

Western Washington University, Department of Chemistry, Bellingham, WA; and.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
MURINE MONOCLONAL 3E6 FAB HEAVY CHAIN	C	219	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
MURINE MONOCLONAL 3E6 FAB LIGHT CHAIN	D	213	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
MURINE MONOCLONAL G99 FAB HEAVY CHAIN	E	224	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details
MURINE MONOCLONAL G99 FAB LIGHT CHAIN	F	214	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details
Coagulation factor VIII	M	183	Homo sapiens	Mutation(s): 0  Gene Names: F8 (F8C)
Find proteins for P00451 (Homo sapiens) Go to Gene View: F8 Go to UniProtKB:  P00451

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.47 Å
• R-Value Free: 0.238 
• R-Value Work: 0.188 
• Space Group: P 2 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 54.250	α = 90.00
b = 71.160	β = 90.00
c = 277.850	γ = 90.00

Software Package:

Software Name	Purpose
PHENIX	refinement
MOSFLM	data reduction
PHASER	phasing
PDB_EXTRACT	data extraction
REFMAC	refinement
SCALA	data scaling
CrystalClear	data collection

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-05-01 
• Released Date: 2014-01-15 
• Deposition Author(s): Walter, J.D., Meeks, S.L., Healey, J.F., Lollar, P., Spiegel, P.C.

Revision History 

• Version 1.0: 2014-01-15
  Type: Initial release