6AOD

FXIa antibody complex

Summary for 6AOD

• Entry DOI: 10.2210/pdb6aod/pdb
• Descriptor: FXIa Antibody FAB Light Chain, FXIa Antibody FAB Heavy Chain, Coagulation factor XI, ... (8 entities in total)
• Functional Keywords: fxia antibody fab, blood clotting, blood clotting-immune system complex, blood clotting/immune system
• Biological source: Homo sapiens; More
• Cellular location: Secreted: P03951
• Total number of polymer chains: 3
• Total formula weight: 77676.81

Authors

Lolicato, M.,Minor, D.L. (deposition date: 2017-08-15, release date: 2018-03-14, Last modification date: 2024-11-13)

Primary citation

Ely, L.K.,Lolicato, M.,David, T.,Lowe, K.,Kim, Y.C.,Samuel, D.,Bessette, P.,Garcia, J.L.,Mikita, T.,Minor, D.L.,Coughlin, S.R.
Structural Basis for Activity and Specificity of an Anticoagulant Anti-FXIa Monoclonal Antibody and a Reversal Agent.
Structure, 26:187-198.e4, 2018

PubMed Abstract: Coagulation factor XIa is a candidate target for anticoagulants that better separate antithrombotic efficacy from bleeding risk. We report a co-crystal structure of the FXIa protease domain with DEF, a human monoclonal antibody that blocks FXIa function and prevents thrombosis in animal models without detectable increased bleeding. The light chain of DEF occludes the FXIa S1 subsite and active site, while the heavy chain provides electrostatic interactions with the surface of FXIa. The structure accounts for the specificity of DEF for FXIa over its zymogen and related proteases, its active-site-dependent binding, and its ability to inhibit substrate cleavage. The inactive FXIa protease domain used to obtain the DEF-FXIa crystal structure reversed anticoagulant activity of DEF in plasma and in vivo and the activity of a small-molecule FXIa active-site inhibitor in vitro. DEF and this reversal agent for FXIa active-site inhibitors may help support clinical development of FXIa-targeting anticoagulants.

PubMed: 29336885
DOI: 10.1016/j.str.2017.12.010

Experimental method

X-RAY DIFFRACTION (1.8 Å)