T-cell modulatory multimeric polypeptides and methods of use thereof
The present disclosure provides variant immunomodulatory polypeptides, and fusion polypeptides comprising the variant immunomodulatory peptides. The present disclosure provides T-cell modulatory multimeric polypeptides, and compositions comprising same, where the T-cell modulatory multimeric polypeptides comprise a variant immunomodulatory polypeptide of the present disclosure. The present disclosure provides nucleic acids comprising nucleotide sequences encoding the T-cell modulatory multimeric polypeptides, and host cells comprising the nucleic acids. The present disclosure provides methods of modulating the activity of a T cell; the methods comprise contacting the T cell with a T-cell modulatory multimeric polypeptide of the present disclosure.
1. A fusion polypeptide comprising:
a) one or more variant IL-2 polypeptides, wherein each of the one or more variant IL-2 polypeptides comprises up to four amino acid substitutions relative to the amino acid sequence set forth in SEQ ID NO:1, wherein amino acid 42 is an amino acid other than a phenylalanine, wherein amino acid 16 is an amino acid other than a histidine, and wherein each of the one or more variant IL2 polypeptides exhibit reduced binding affinity to an IL-2 receptor (IL2R) comprising alpha, beta, and gamma polypeptides having amino acid sequences set forth in SEQ ID NOs: 18-20, compared to the binding affinity of the IL-2 amino acid sequence set forth in SEQ ID NO: 1 for the IL2R; and
b) a heterologous fusion partner comprising an antibody Fc region, wherein the antibody Fc region comprises an amino acid sequence having at least 95% sequence identity to the amino acid sequence set forth in SEQ ID NO:57, wherein the percent sequence identity is determinable by a sequence alignment performed using BLAST,
wherein the fusion polypeptide does not comprise a major histocompatibility complex (MHC) polypeptide.
2. The fusion polypeptide of claim 1 , wherein the antibody Fc region comprises one or more substitutions selected from an L14A substitution, an L15A substitution, an N77A substitution, a P111S substitution based on the amino acid numbering of SEQ ID NO:57.
3. The fusion polypeptide of claim 1 , wherein the fusion polypeptide comprises from 400 to 600 amino acids.
4. The fusion polypeptide of claim 1 , wherein the fusion polypeptide comprises from 500 to 700 amino acids.
5. The fusion polypeptide of claim 1 , wherein the heterologous fusion partner comprises an antibody Fc region and an antigen-binding region of an antibody.
6. The fusion polypeptide of claim 5 , wherein the fusion polypeptide comprises from 400 to 700 amino acids.
7. The fusion polypeptide of claim 5 , wherein the fusion polypeptide comprises from 700 to 900 amino acids.
8. The fusion polypeptide of claim 1 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.
9. The fusion polypeptide of claim 6 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.
10. The fusion polypeptide of claim 7 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.
11. A fusion polypeptide comprising:
a) one or more variant IL-2 polypeptides, wherein each of the one or more variant IL-2 polypeptides comprises up to three amino acid substitutions relative to the amino acid sequence set forth in SEQ ID NO:1, wherein amino acid 42 is an amino acid other than a phenylalanine, wherein amino acid 16 is an amino acid other than a histidine, and wherein each of the one or more variant IL2 polypeptides exhibit reduced binding affinity to an IL-2 receptor (IL2R) comprising alpha, beta, and gamma polypeptides having amino acid sequences set forth in SEQ ID NOs: 18-20, compared to the binding affinity of the IL-2 amino acid sequence set forth in SEQ ID NO: 1 for the IL2R; and
b) a heterologous fusion partner comprising an antibody Fc region, wherein the antibody Fc region comprises an amino acid sequence having at least 95% sequence identity to the amino acid sequence set forth in SEQ ID NO: 57, wherein the percent sequence identity is determinable by a sequence alignment performed using BLAST,
wherein the fusion polypeptide does not comprise a major histocompatibility complex (MHC) polypeptide.
12. The fusion polypeptide of claim 11 , wherein the antibody Fc region comprises one or more substitutions selected from an L14A substitution, an L15A substitution, an N77A substitution, a P111S substitution based on the amino acid numbering of SEQ ID NO:57.
13. The fusion polypeptide of claim 11 , wherein the fusion polypeptide comprises from 400 to 600 amino acids.
14. The fusion polypeptide of claim 11 , wherein the fusion polypeptide comprises from 500 to 700 amino acids.
15. The fusion polypeptide of claim 11 , wherein the heterologous fusion partner comprises an antibody Fc region and an antigen-binding region of an antibody.
16. The fusion polypeptide of claim 15 , wherein the fusion polypeptide comprises from 400 to 700 amino acids.
17. The fusion polypeptide of claim 15 , wherein the fusion polypeptide comprises from 700 to 900 amino acids.
18. The fusion polypeptide of claim 11 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.
19. The fusion polypeptide of claim 16 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.
20. The fusion polypeptide of claim 17 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.
21. A fusion polypeptide comprising:
a) one or more variant IL-2 polypeptides, wherein each of the one or more variant IL-2 polypeptides comprises two amino acid substitutions relative to the amino acid sequence set forth in SEQ ID NO:1, wherein amino acid 42 is an amino acid other than a phenylalanine, wherein amino acid 16 is an amino acid other than a histidine, and wherein each of the one or more variant IL2 polypeptides exhibit reduced binding affinity to an IL-2 receptor (IL2R) comprising alpha, beta, and gamma polypeptides having amino acid sequences set forth in SEQ ID NOs: 18-20, compared to the binding affinity of the IL-2 amino acid sequence set forth in SEQ ID NO: 1 for the IL2R; and
b) a heterologous fusion partner comprising an antibody Fc region, wherein the antibody Fc region comprises an amino acid sequence having at least 95% sequence identity to the amino acid sequence set forth in SEQ ID NO: 57, wherein the percent sequence identity is determinable by a sequence alignment performed using BLAST,
wherein the fusion polypeptide does not comprise a major histocompatibility complex (MHC) polypeptide.
22. The fusion polypeptide of claim 21 , wherein the antibody Fc region comprises one or more substitutions selected from an L14A substitution, an L15A substitution, an N77A substitution, a P111S substitution based on the amino acid numbering of SEQ ID NO:57.
23. The fusion polypeptide of claim 21 , wherein the fusion polypeptide comprises from 400 to 600 amino acids.
24. The fusion polypeptide of claim 21 , wherein the fusion polypeptide comprises from 500 to 700 amino acids.
25. The fusion polypeptide of claim 21 , wherein the heterologous fusion partner comprises an antibody Fc region and an antigen-binding region of an antibody.
26. The fusion polypeptide of claim 25 , wherein the fusion polypeptide comprises from 400 to 700 amino acids.
27. The fusion polypeptide of claim 25 , wherein the fusion polypeptide comprises from 700 to 900 amino acids.
28. The fusion polypeptide of claim 21 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.
29. The fusion polypeptide of claim 26 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.
30. The fusion polypeptide of claim 27 , wherein amino acid 16 of each of the one or more variant IL-2 polypeptides is Ala, Thr, Asp, or Glu; and wherein amino acid 42 of each of the one or more variant IL-2 polypeptides is Ala or Thr.