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 comprising a nucleic acid sequence that encodes a vitamin K-dependent polypeptide, wherein said vitamin K-dependent polypeptide comprises a modified gamma-carboxyglutamic acid (GLA) domain that enhances membrane binding affinity of said polypeptide compared to a native vitamin K-dependent polypeptide, and wherein said modified GLA domain comprises a hydrophobic amino acid residue substituted at the position corresponding to position 34 of SEQ ID NO:5.
2. The nucleic acid molecule of claim 1 , wherein said modified GLA domain further comprises an amino acid substitution at the position corresponding to position 5, 9, 11, 12, 29, 33, 35, or 36 of SEQ ID NO:5.
3. The nucleic acid molecule of claim 1 , wherein said modified GLA domain further comprises an amino acid substitution at the position corresponding to position 11 of SEQ ID NO:5.
4. The nucleic acid molecule of claim 3 , wherein said modified GLA domain further comprises an amino acid substitution at the position corresponding to position 29 or 33 of SEQ ID NO:5.
5. The nucleic acid molecule of claim 4 , wherein a glutamine residue is substituted at the position corresponding to position 11 and a glutamic acid residue is substituted at the position corresponding to position 33 of SEQ ID NO:5.
6. The nucleic acid molecule of claim 5 , wherein said modified GLA domain further comprises an amino acid substitution at the position corresponding to position 35 of SEQ ID NO:5.
7. The nucleic acid molecule of claim 6 , wherein a glutamic acid residue is substituted at the position corresponding to position 35 of SEQ ID NO:5.
8. The nucleic acid molecule of claim 7 , wherein a phenylalanine, leucine, or isoleucine residue is substituted at the position corresponding to position 34 of SEQ ID NO:5.
9. The nucleic acid molecule of claim 1 , wherein said modified GLA domain further comprises an amino acid substitution at the position corresponding to position 35 of SEQ ID NO:5.
10. An expression vector comprising the nucleic acid sequence of claim 1 .
11. An isolated mammalian host cell comprising the expression vector of claim 10 .
12. A method for producing a vitamin K-dependent polypeptide having a modified GLA domain, said method comprising (a) providing a culture of the mammalian host cell of claim 11 under conditions that permit expression of the polypeptide, and (b) recovering the polypeptide.
13. An isolated nucleic acid molecule comprising a nucleic acid sequence encoding a Factor VII or Factor VIIa polypeptide, wherein said Factor VII or Factor VIIa polypeptide comprises a modified GLA domain that enhances membrane binding affinity of said polypeptide compared to a native Factor VII or Factor VIIa polypeptide, and wherein said modified GLA domain comprises a hydrophobic amino acid residue substituted at position 33 of SEQ ID NO:3.
14. The nucleic acid molecule of claim 13 , wherein said modified GLA domain comprises a phenylalanine, leucine, or isoleucine residue substituted at position 33.
15. The nucleic acid molecule of claim 13 , wherein said modified GLA domain further comprises an amino acid substitution at position 10.
16. The nucleic acid molecule of claim 15 , wherein a glutamine, asparagine, glutamic acid, or aspartic acid residue is substituted at position 10.
17. The nucleic acid molecule of claim 15 , wherein a glutamine residue is substituted at position 10.
18. The nucleic acid molecule of claim 17 , wherein said modified GLA domain further comprises an amino acid substitution at position 32.
19. The nucleic acid molecule of claim 18 , wherein a glutamic acid residue is substituted at position 32.
20. The nucleic acid molecule of claim 19 , wherein said modified GLA domain further comprises an amino acid substitution at position 34.
21. The nucleic acid molecule of claim 20 , wherein a glutamic acid residue is substituted at position 34.
22. The nucleic acid molecule of claim 21 , wherein a phenylalanine, leucine, or isoleucine residue is substituted at position 33.
23. The nucleic acid molecule of claim 22 , wherein a phenylalanine residue is substituted at position 33.
24. The nucleic acid molecule of claim 20 , wherein said modified GLA domain further comprises an amino acid residue inserted at position 4.
25. The nucleic acid molecule of claim 24 , wherein a tyrosine residue is inserted at position 4.
26. An expression vector comprising the nucleic acid sequence of claim 13 .
27. An isolated mammalian host cell comprising the expression vector of claim 26 .
28. A method for producing a Factor VII or Factor VIIa polypeptide having a modified GLA domain, said method comprising (a) providing a culture of the mammalian host cell of claim 27 under conditions that permit expression of the polypeptide, and (b) recovering the polypeptide.