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coagulation factor XI

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Target not currently curated in GtoImmuPdb

Target id: 2360

Nomenclature: coagulation factor XI

Family: S1: Chymotrypsin, Blood coagulation components

Gene and Protein Information Click here for help
Species TM AA Chromosomal Location Gene Symbol Gene Name Reference
Human - 625 4q35.2 F11 coagulation factor XI
Mouse - 624 8 25.14 cM F11 coagulation factor XI
Rat - 556 16q11 F11 coagulation factor XI
Previous and Unofficial Names Click here for help
Cf11 | FXI | plasma thromboplastin antecedent | PTA
Database Links Click here for help
Specialist databases
MEROPS S01.213 (Hs)
Other databases
ChEMBL Target
DrugBank Target
Ensembl Gene
Entrez Gene
Human Protein Atlas
KEGG Enzyme
RefSeq Nucleotide
RefSeq Protein
Enzyme Reaction Click here for help
EC Number:

Download all structure-activity data for this target as a CSV file go icon to follow link

Key to terms and symbols View all chemical structures Click column headers to sort
Ligand Sp. Action Value Parameter Reference
alpha-ketothiazole analogue 36 Small molecule or natural product Hs Inhibition 7.5 pIC50 3
pIC50 7.5 (IC50 3x10-8 M) [3]
Inhibitor Comments
BMS-962212 is a small molecule FXIa inhibitor - Ki 0.7 nM [5]. Asundexian (BAY 2433334) inhibits FXIa activity in vitro with an IC50 of 0.92 nM [2].
Key to terms and symbols Click column headers to sort
Antibody Sp. Action Value Parameter Reference
osocimab Peptide Hs Inhibition 8.6 pKd 7
pKd 8.6 (Kd 2.4x10-9 M) [7]
Description: Binding affinity by SPR
Clinically-Relevant Mutations and Pathophysiology Click here for help
Disease:  Factor XI deficiency
Description: Hemophilia C is caused by autosomal recessive FXI deficiency and is associated with bleeding, although the bleeding pattern is unpredictable (or inconsistent) compared to hemophilias A and B. Bleeding events occur after surgery or injury, and trauma to the mucocutaneous lining of the oral or nasal cavities and the urinary tract is often the source of bleeding.
Synonyms: hemophilia C
plasma thromboplastin antecedent (PTA) deficiency
Rosenthal syndrome
Disease Ontology: DOID:2229
OMIM: 612416
Orphanet: ORPHA329
General Comments
FXI is the inactive proenzyme (or zymogen) of the plasma serine protease activated FXI (FXIa). FXI can be activated by FXIIa, thrombin, or FXIa. FXIa activates FIX to FIXa which in turn activates FX. FXI is produced in the liver and circulates as a homodimer.
FXIa contributes to thrombin generation and thrombus formation. Epidemiologic studies show that an elevated level of FXI is associated with an increased risk of venous thrombosis [4], and in contrast, FXI deficiency is associated with a reduced thrombosis risk [6]. These findings and results from experimental studies have linked FXI to thromboembolic disease, and suggest that FXI and/or FXIa inhibition may offer a novel approach for the development of antithrombotic therapeutics that would not impair normal hemostasis [1].


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1. Gailani D, Gruber A. (2016) Factor XI as a Therapeutic Target. Arterioscler Thromb Vasc Biol, 36 (7): 1316-22. [PMID:27174099]

2. Jiminez Nunez E, Ackerstaff J, Rohrig S, Hillisch A, Meier K, Heitmeier S, Tersteegen A, Stampfuss J, Ellerbrock P, Melbom D et al.. (2017) Substituted oxopyridine derivatives. Patent number: WO2017005725A1. Assignee: Bayer Pharma. Priority date: 09/07/2015. Publication date: 12/01/2017.

3. Maryanoff BE, Costanzo MJ. (2008) Inhibitors of proteases and amide hydrolases that employ an alpha-ketoheterocycle as a key enabling functionality. Bioorg Med Chem, 16 (4): 1562-95. [PMID:18053726]

4. Meijers JC, Tekelenburg WL, Bouma BN, Bertina RM, Rosendaal FR. (2000) High levels of coagulation factor XI as a risk factor for venous thrombosis. N Engl J Med, 342 (10): 696-701. [PMID:10706899]

5. Pinto DJP, Orwat MJ, Smith 2nd LM, Quan ML, Lam PYS, Rossi KA, Apedo A, Bozarth JM, Wu Y, Zheng JJ et al.. (2017) Discovery of a Parenteral Small Molecule Coagulation Factor XIa Inhibitor Clinical Candidate (BMS-962212). J Med Chem, 60 (23): 9703-9723. [PMID:29077405]

6. Salomon O, Steinberg DM, Koren-Morag N, Tanne D, Seligsohn U. (2008) Reduced incidence of ischemic stroke in patients with severe factor XI deficiency. Blood, 111 (8): 4113-7. [PMID:18268095]

7. Schaefer M, Buchmueller A, Dittmer F, Straßburger J, Wilmen A. (2019) Allosteric Inhibition as a New Mode of Action for BAY 1213790, a Neutralizing Antibody Targeting the Activated Form of Coagulation Factor XI. J Mol Biol, 431 (24): 4817-4833. [PMID:31655039]

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