6R8X

COAGULATION FACTOR XI CATALYTIC DOMAIN IN COMPLEX WITH FAB-PORTION OF MAA868

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.220 

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Literature

MAA868, a novel FXI antibody with a unique binding mode, shows durable effects on markers of anticoagulation in humans.

Koch, A.W., Schiering, N., Melkko, S., Ewert, S., Salter, J., Zhang, Y., McCormack, P., Yu, J., Huang, X., Chiu, Y.H., Chen, Z., Schleeger, S., Horny, G., DiPetrillo, K., Muller, L., Hein, A., Villard, F., Scharenberg, M., Ramage, P., Hassiepen, U., Cote, S., DeGagne, J., Krantz, C., Eder, J., Stoll, B., Kulmatycki, K., Feldman, D.L., Hoffmann, P., Basson, C.T., Frost, R.J.A., Khder, Y.

(2019) Blood 133: 1507-1516

  • DOI: 10.1182/blood-2018-10-880849
  • Primary Citation of Related Structures:  
    6R8X

  • PubMed Abstract: 

    • A large unmet medical need exists for safer antithrombotic drugs because all currently approved anticoagulant agents interfere with hemostasis, leading to an increased risk of bleeding. Genetic and pharmacologic evidence in humans and animals suggests that reducing factor XI (FXI) levels has the potential to effectively prevent and treat thrombosis with a minimal risk of bleeding ...

    A large unmet medical need exists for safer antithrombotic drugs because all currently approved anticoagulant agents interfere with hemostasis, leading to an increased risk of bleeding. Genetic and pharmacologic evidence in humans and animals suggests that reducing factor XI (FXI) levels has the potential to effectively prevent and treat thrombosis with a minimal risk of bleeding. We generated a fully human antibody (MAA868) that binds the catalytic domain of both FXI (zymogen) and activated FXI. Our structural studies show that MAA868 traps FXI and activated FXI in an inactive, zymogen-like conformation, explaining its equally high binding affinity for both forms of the enzyme. This binding mode allows the enzyme to be neutralized before entering the coagulation process, revealing a particularly attractive anticoagulant profile of the antibody. MAA868 exhibited favorable anticoagulant activity in mice with a dose-dependent protection from carotid occlusion in a ferric chloride-induced thrombosis model. MAA868 also caused robust and sustained anticoagulant activity in cynomolgus monkeys as assessed by activated partial thromboplastin time without any evidence of bleeding. Based on these preclinical findings, we conducted a first-in-human study in healthy subjects and showed that single subcutaneous doses of MAA868 were safe and well tolerated. MAA868 resulted in dose- and time-dependent robust and sustained prolongation of activated partial thromboplastin time and FXI suppression for up to 4 weeks or longer, supporting further clinical investigation as a potential once-monthly subcutaneous anticoagulant therapy.

    Organizational Affiliation: 

    Novartis Institutes for BioMedical Research, Basel, Switzerland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Coagulation factor XIA238Homo sapiensMutation(s): 1 
Gene Names: F11
EC: 3.4.21.27
UniProt & NIH Common Fund Data Resources
Find proteins for P03951 (Homo sapiens)
Explore P03951 
Go to UniProtKB:  P03951
PHAROS:  P03951
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03951
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
anti-Factor-XI Fab fragment light chain MAA868B216unidentifiedMutation(s): 0 
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Protein Feature View
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
anti-Factor-XI Fab fragment heavy chain MAA868C236unidentifiedMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.220 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 191.274α = 90
b = 53.216β = 94.56
c = 65.164γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PHASERphasing
BUSTERrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-10
    Type: Initial release