4KI5

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.47 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

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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

  • DOI: 10.1182/blood-2013-08-519124
  • Structures With Same Primary Citation

  • 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 hemoph ...

    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.


    Organizational Affiliation

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



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MURINE MONOCLONAL 3E6 FAB HEAVY CHAINC219Mus musculusMutation(s): 0 
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MURINE MONOCLONAL 3E6 FAB LIGHT CHAIND213Mus musculusMutation(s): 0 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
MURINE MONOCLONAL G99 FAB HEAVY CHAINE224Mus musculusMutation(s): 0 
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
MURINE MONOCLONAL G99 FAB LIGHT CHAINF214Mus musculusMutation(s): 0 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Coagulation factor VIIIM183Homo sapiensMutation(s): 0 
Gene Names: F8F8C
Find proteins for P00451 (Homo sapiens)
Explore P00451 
Go to UniProtKB:  P00451
NIH Common Fund Data Resources
PHAROS  P00451
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.47 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.25α = 90
b = 71.16β = 90
c = 277.85γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
CrystalCleardata collection
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

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