7AHV

Anti-FIXa Fab of mim8 in complex with human FIXa

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.11 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.228 

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Literature

A factor VIIIa-mimetic bispecific antibody, Mim8, ameliorates bleeding upon severe vascular challenge in hemophilia A mice.

Ostergaard, H., Lund, J., Greisen, P.J., Kjellev, S., Henriksen, A., Lorenzen, N., Johansson, E., Roder, G., Rasch, M.G., Johnsen, L.B., Egebjerg, T., Lund, S., Rahbek-Nielsen, H., Gandhi, P.S., Lamberth, K., Loftager, M., Andersen, L.M., Bonde, A.C., Stavenuiter, F., Madsen, D.E., Li, X., Holm, T.L., Ley, C.D., Thygesen, P., Zhu, H., Zhou, R., Thorn, K., Yang, Z., Hermit, M.B., Bjelke, J.R., Hansen, B.G., Hilden, I.

(2021) Blood 138: 1258-1268

  • DOI: https://doi.org/10.1182/blood.2020010331
  • Primary Citation of Related Structures:  
    7AHU, 7AHV

  • PubMed Abstract: 

    • Hemophilia A is a bleeding disorder resulting from deficient factor VIII (FVIII), which normally functions as a cofactor to activated factor IX (FIXa) that facilitates activation of factor X (FX). To mimic this property in a bispecific antibody format, a screening was conducted to identify functional pairs of anti-FIXa and anti-FX antibodies, followed by optimization of functional and biophysical properties ...

    Hemophilia A is a bleeding disorder resulting from deficient factor VIII (FVIII), which normally functions as a cofactor to activated factor IX (FIXa) that facilitates activation of factor X (FX). To mimic this property in a bispecific antibody format, a screening was conducted to identify functional pairs of anti-FIXa and anti-FX antibodies, followed by optimization of functional and biophysical properties. The resulting bispecific antibody (Mim8) assembled efficiently with FIXa and FX on membranes, and supported activation with an apparent equilibrium dissociation constant of 16 nM. Binding affinity with FIXa and FX in solution was much lower, with equilibrium dissociation constant values for FIXa and FX of 2.3 and 1.5 µM, respectively. In addition, the activity of Mim8 was dependent on stimulatory activity contributed by the anti-FIXa arm, which enhanced the proteolytic activity of FIXa by 4 orders of magnitude. In hemophilia A plasma and whole blood, Mim8 normalized thrombin generation and clot formation, with potencies 13 and 18 times higher than a sequence-identical analogue of emicizumab. A similar potency difference was observed in a tail vein transection model in hemophilia A mice, whereas reduction of bleeding in a severe tail-clip model was observed only for Mim8. Furthermore, the pharmacokinetic parameters of Mim8 were investigated and a half-life of 14 days shown in cynomolgus monkeys. In conclusion, Mim8 is an activated FVIII mimetic with a potent and efficacious hemostatic effect based on preclinical data.

    Organizational Affiliation: 

    Global Drug Discovery and.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
anti-FIXa Fab of mim8 heavy chain224Homo sapiensMutation(s): 0 
Entity Groups  
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
anti-FIXa Fab of mim8 light chain214Homo sapiensMutation(s): 0 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Coagulation factor IXC [auth L]59Homo sapiensMutation(s): 0 
Gene Names: F9
EC: 3.4.21.22
UniProt & NIH Common Fund Data Resources
Find proteins for P00740 (Homo sapiens)
Explore P00740 
Go to UniProtKB:  P00740
PHAROS:  P00740
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00740
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Coagulation factor IXD [auth H]235Homo sapiensMutation(s): 0 
Gene Names: F9
EC: 3.4.21.22
UniProt & NIH Common Fund Data Resources
Find proteins for P00740 (Homo sapiens)
Explore P00740 
Go to UniProtKB:  P00740
PHAROS:  P00740
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00740
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
0GJ
Query on 0GJ
Download Ideal Coordinates CCD File 
O [auth H]L-alpha-glutamyl-N-{(1S)-4-{[amino(iminio)methyl]amino}-1-[(1S)-2-chloro-1-hydroxyethyl]butyl}glycinamide
C14 H28 Cl N6 O5
XELWNHKFCNMWQO-LPEHRKFASA-O		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
H [auth A]
I [auth A]
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth B],
K [auth B],
L [auth B],
M [auth B],
N [auth L],
P [auth H],
Q [auth H],
R [auth H],
S [auth H],
T [auth H],
U [auth H],
V [auth H]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
W [auth H]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 6
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000288 (0GJ)
Query on PRD_000288		O [auth H]GLU-GLY-ARG-CHLOROMETHYL KETONEPeptide-like / Inhibitor Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.11 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.228 
  • Space Group: P 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.03α = 90
b = 97.03β = 90
c = 254.51γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-07-07
    Type: Initial release
  • Version 1.1: 2021-10-20
    Changes: Data collection, Database references