Compositions and methods for modulating hemostasis
Factor X/Xa variants and methods of use thereof are disclosed.
1. A Factor Xa variant which modulates hemostasis wherein
the Ile at position 16 in chymotrypsin numbering system is Thr or Met.
2. The Factor Xa variant of claim 1 , wherein the Ile at position 16 is Thr.
3. The Factor Xa variant of claim 1 , further comprising a substitution at position 17 in chymotrypsin numbering system.
4. The Factor Xa variant of claim 1 , further comprising at least one substitution at position 18, 19, or 194 in chymotrypsin numbering system.
5. The Factor Xa variant of claim 2 , wherein all residues other than the Thr at position 16 are wild-type.
6. The Factor Xa variant of claim 1 , wherein the Factor Xa variant has a longer plasma half life than wild-type Factor Xa.
7. The Factor Xa variant of claim 1 , wherein said Factor Xa comprises a light and heavy chain, wherein the light chain has at least 80% homology with SEQ ID NO: 3, wherein the heavy chain has at least 80% homology with SEQ ID NO: 5 wherein the Ile at position 16 in chymotrypsin numbering system is Thr or Met.
8. The Factor Xa variant of claim 7 , wherein the Ile at position 16 is Thr.
9. The Factor Xa variant of claim 7 , wherein said light chain is SEQ ID NO: 3 and said heavy chain is SEQ ID NO: 5 wherein the Ile at position 16 in chymotrypsin numbering system is Thr or Met.
10. A composition comprising at least one Factor Xa variant of claim 1 and at least one pharmaceutically acceptable carrier.
11. A method for treatment of a hemostasis related disorder in a patient in need thereof comprising administration of a therapeutically effective amount of the Factor Xa variant of claim 1 in a pharmaceutically acceptable carrier.
12. The method of claim 11 , wherein said hemostasis related disorder is selected from the group consisting of hemophilia A, hemphilia B, hemophilia A and B associated with inhibitory antibodies, coagulation factor deficiency, vitamin K epoxide reductase C1 deficiency, gamma-carboxylase deficiency, bleeding associated with trauma, injury, thrombosis, thrombocytopenia, stroke, coagulopathy, disseminated intravascular coagulation (DIC); over-anticoagulation treatment disorders, Bernard Soulier syndrome, Glanzman thromblastemia, and storage pool deficiency.
13. The method of claim 12 , wherein said coagulation factor deficiency is a deficiency of a coagulation factor selected from the group consisting of at least one of factor VII, factor IX, factor X, factor XI, factor V, factor XII, factor II, and von Willebrand factor.
14. The method of claim 12 , wherein said over-anticoagulation treatment disorder results from administration of heparin, low molecular weight heparin, pentasaccharide, warfarin, small molecule antithrombotics and FXa inhibitors.
15. An isolated nucleic acid encoding the Factor Xa variant of claim 1 .
16. An isolated nucleic acid molecule encoding a human Factor X variant, wherein said Factor X variant comprises at least one substitution selected from the group consisting of:
a) the Ile at position 16 in chymotrypsin numbering system is Thr or Met, and
b) the Val at position 17 in chymotrypsin numbering system is Thr or Ser.
17. The nucleic acid molecule of claim 16 , wherein the Ile at position 16 is Thr.
18. The nucleic acid molecule of claim 16 , wherein the Val at position 17 is Thr.
19. The nucleic acid molecule of claim 16 , wherein the Val at position 17 is Ser.
20. The nucleic acid molecule of claim 16 , wherein said nucleic acid molecule encodes an intracellular cleavage site, wherein said intracellular cleavage site is between positions 15 and 16 in chymotrypsin numbering system or replaces the activation peptide.
21. The nucleic acid molecule of claim 20 , wherein said intracellular protease cleavage site is a PACE/furin cleavage site.
22. The nucleic acid molecule of claim 16 , wherein said Factor X variant comprises a propeptide sequence and/or signal peptide.
23. The nucleic acid molecule of claim 16 , wherein said FX polypeptide further comprises (i) a propeptide sequence derived from prothrombin, (ii) an intracellular protease cleavage site comprising amino acids RKR replacing the Activation Peptide sequence, and (iii) substitution of the amino acid corresponding to Ile 16 by Thr.
24. An expression vector comprising the nucleic acid of claim 16 operably linked to a regulatory sequence.
25. The vector of claim 24 , selected from the group consisting of an adenoviral vector, an adenovirus-associated vector, a retroviral vector, a plasmid, and a lentiviral vector.
26. A host cell comprising the vector of claim 24 .
27. The host cell of claim 26 , wherein said host cells are CHO cells.
28. A method of producing activated Factor X (FXa) comprising incubating the host cell of claim 27 and purifying the FXa produced thereby.
29. A Factor Xa variant which modulates hemostasis wherein the Val at position 17 in chymotrypsin numbering system is Thr or Ser.
30. The Factor Xa variant of claim 29 , wherein the Val at position 17 is Thr.
31. The Factor Xa variant of claim 29 , wherein the Val at position 17 is Ser.
32. The Factor Xa variant of claim 29 , further comprising a substitution at position 16 in chymotrypsin numbering system.
33. The Factor Xa variant of claim 29 , further comprising at least one substitution at position 18, 19, or 194 in chymotrypsin numbering system.
34. The Factor Xa variant of claim 29 , wherein the Factor Xa variant has a longer plasma half life than wild-type Factor Xa.
35. The Factor Xa variant of claim 29 , wherein said Factor Xa comprises a light and heavy chain, wherein the light chain has at least 80% homology with SEQ ID NO: 3, wherein the heavy chain has at least 80% homology with SEQ ID NO: 5 wherein the Val at position 17 in chymotrypsin numbering system is Thr or Ser.
36. The Factor Xa variant of claim 35 , wherein said light chain is SEQ ID NO: 3 and said heavy chain is SEQ ID NO: 5 wherein the Val at position 17 in chymotrypsin numbering system is Thr or Ser.
37. A composition comprising at least one Factor Xa variant of claim 29 and at least one pharmaceutically acceptable carrier.
38. A method for treatment of a hemostasis related disorder in a patient in need thereof comprising administration of a therapeutically effective amount of the Factor Xa variant of claim 31 in a pharmaceutically acceptable carrier.
39. The method of claim 38 , wherein said hemostasis related disorder is selected from the group consisting of hemophilia A, hemphilia B, hemophilia A and B associated with inhibitory antibodies, coagulation factor deficiency, vitamin K epoxide reductase C1 deficiency, gamma-carboxylase deficiency, bleeding associated with trauma, injury, thrombosis, thrombocytopenia, stroke, coagulopathy, disseminated intravascular coagulation (DIC); over-anticoagulation treatment disorders, Bernard Soulier syndrome, Glanzman thromblastemia, and storage pool deficiency.
40. The method of claim 39 , wherein said coagulation factor deficiency is a deficiency of a coagulation factor selected from the group consisting of at least one of factor VII, factor IX, factor X, factor XI, factor V, factor XII, factor II, and von Willebrand factor.
41. The method of claim 39 , wherein said over-anticoagulation treatment disorder results from administration of heparin, low molecular weight heparin, pentasaccharide, warfarin, small molecule antithrombotics and FXa inhibitors.