Modified vitamin K-dependent polypeptides
The invention provides vitamin K-dependent polypeptides with enhanced membrane binding affinity. These polypeptides can be used to modulate clot formation in mammals. Methods of modulating clot formation in mammals are also described.
1. An isolated nucleic acid molecule, said nucleic acid molecule comprising a nucleic acid sequence encoding a mutant Factor VII (FVII) or mutant Factor VIIa (FVIIa) polypeptide, said mutant FVII or mutant FVIIa polypeptide comprising a modified γ-carboxyglutamic acid (GLA) domain that enhances membrane binding affinity of said mutant FVII or mutant FVIIa polypeptide relative to a wild type human Factor VII (hFVII) or wild type human Factor VIIa (hFVIIa) polypeptide, wherein said modified GLA domain comprises an amino acid sequence that differs from the amino acid sequence of the GLA domain of hFVII or hFVIIa polypeptide shown in SEQ ID NO:3 in 1 to 5 amino acid substitutions, wherein the proline residue at amino acid position 10 of SEQ ID NO:3 is substituted with a glutamine, aspartic acid or glutamic acid residue in the modified GLA domain, and wherein amino acid positions of the amino acid sequence of the modified GLA domain are numbered according to SEQ ID NO:3.
2. The isolated nucleic acid molecule of claim 1 , wherein the proline residue at position 10 of SEQ ID NO:3 is substituted with a glutamine residue in the modified GLA domain.
3. The isolated nucleic acid molecule of claim 1 , wherein the arginine residue at position 28 of SEQ ID NO:3 is substituted with a different amino acid residue in the modified GLA domain.
4. The isolated nucleic acid molecule of claim 3 , wherein the arginine residue at position 28 of SEQ ID NO:3 is substituted with a phenylalanine residue in the modified GLA domain.
5. The isolated nucleic acid molecule of claim 4 , wherein the proline residue at position 10 of SEQ ID NO:3 is substituted with a glutamine residue in the modified GLA domain.
6. The isolated nucleic acid molecule of claim 1 , wherein the lysine residue at position 32 of SEQ ID NO:3 is substituted with a different amino acid residue in the modified GLA domain.
7. The isolated nucleic acid molecule of claim 6 , wherein the lysine residue at position 32 of SEQ ID NO:3 is substituted with a glutamic acid residue in the modified GLA domain.
8. The isolated nucleic acid molecule of claim 6 , wherein the lysine residue at position 32 of SEQ ID NO:3 is substituted with an aspartic acid residue in the modified GLA domain.
9. The isolated nucleic acid molecule of claim 7 , wherein the proline residue at position 10 of SEQ ID NO:3 is substituted with a glutamine residue in the modified GLA domain.
10. The isolated nucleic acid molecule of claim 8 , wherein the proline residue at position 10 of SEQ ID NO:3 is substituted with a glutamine residue in the modified GLA domain.
11. The isolated nucleic acid molecule of claim 1 , wherein the glycine residue at position 11 of SEQ ID NO:3 is substituted with a different amino acid residue in the modified GLA domain.
12. The isolated nucleic acid molecule of claim 11 , wherein the proline residue at position 10 of SEQ ID NO:3 is substituted with a glutamine residue in the modified GLA domain.
13. An isolated nucleic acid molecule comprising a nucleic acid sequence encoding a mutant FVII or mutant FVIIa polypeptide having clotting activity, said mutant FVII or FVIIa polypeptide comprising a modified GLA domain that enhances membrane binding affinity of said mutant FVII or mutant FVIIa polypeptide relative to a wild type hFVII or wild type hFVIIa polypeptide, wherein said modified GLA domain comprises an amino acid sequence that differs from the amino acid sequence of the GLA domain of wild type hFVII or wild type hFVIIa polypeptide shown in SEQ ID NO:3 in two amino acid substitutions, wherein a glutamine residue is substituted for the proline residue at amino acid position 10 of SEQ ID NO:3 and a glutamic residue is substituted for the lysine residue at position 32 of SEQ ID NO:3 in the modified GLA domain, and wherein amino acid positions of the amino acid sequence of the modified GLA domain are numbered according to SEQ ID NO:3.
14. An expression vector comprising the isolated nucleic acid molecule of claim 1 .
15. An expression vector comprising the isolated nucleic acid molecule of claim 13 .
16. An isolated mammalian host cell comprising the isolated nucleic acid molecule of claim 1 .
17. An isolated mammalian host cell comprising the isolated nucleic acid molecule of claim 13 .
18. A method for producing a mutant FVII or mutant FVIIa polypeptide having clotting activity, the method comprising: (a) providing a culture of the mammalian host cell of claim 16 in a culture medium, (b) culturing the culture under conditions that permit expression of the mutant FVII or mutant FVIIa polypeptide, and (c) isolating the mutant FVII or mutant FVIIa polypeptide from the culture medium.
19. A method for producing a mutant FVII or mutant FVIIa polypeptide having clotting activity, the method comprising: (a) providing a culture of the mammalian host cell of claim 17 . in a culture medium, (b) culturing the culture under conditions that permit expression of the mutant FVII or mutant FVIIa polypeptide, and (c) isolating the mutant FVII or mutant FVIIa polypeptide from the culture medium.