Biphasic single-chain insulin analogues
A single-chain insulin comprises a C-domain of 6 to 11 amino acid residues comprising at least two acidic residues at the N-terminal side of the C-domain and at least two basic residues at the C-terminal side of the C-domain peptide, a basic amino acid residue at the position corresponding to A8 of human insulin, and an acidic amino acid residue at the position corresponding to A14 of human insulin. The C-domain may contain a 2 to 4 amino acid joint region between the acidic and basic residues. Residues C1 and C2 may have a net negative charge of −1 or −2; and the remaining C-domain segment may culminates with two basic residues. A pharmaceutical composition comprises the single-chain insulin, formulated at a pH within the range 7.0 to 8.0, and may be formulated at a concentration of 0.6 mM to 5.0 mM and/or at a strength of U-100 to U-1000.
1. A single-chain insulin comprising:
a C-domain of from 6 to 11 amino acid residues comprising at least two acidic residues at the N-terminal side of the C-domain and at least two basic residues at the C-terminal side of the C-domain peptide, wherein the amino acids at the N-terminal side of the C-domain are the amino acids Glu-Glu;
a basic amino acid residue at the position corresponding to A8 of human insulin, and
an acidic amino acid residue at the position corresponding to A14 of human insulin.
2. The single-chain insulin of claim 1 , wherein the C-domain has the amino acids Arg-Arg, Lys-Lys, Arg-Lys, or Lys-Arg at the C-terminal side of the C-domain.
3. The single-chain insulin of claim 2 , wherein the C-domain contains a 2 to 4 amino acid joint region between the acidic residues and the basic residues.
4. The single-chain insulin of claim 3 , wherein the joint region comprises one or more of glycine, serine, and proline residues.
5. The single-chain insulin of claim 4 , wherein the joint region comprises Gly-Pro.
6. The single-chain insulin of claim 5 , wherein the amino acid at the position corresponding to A8 is Lys, Arg, Hist, or Orn.
7. The single-chain insulin of claim 6 , wherein the amino acid at the position corresponding to A14 is Glu.
8. The single-chain insulin of claim 7 , wherein the single chain insulin comprises an acidic amino acid substitution at the position corresponding to B28 and/or B29.
9. The single-chain insulin of claim 8 , having a Histidine at the position corresponding to B10 of human insulin.
10. The single-chain insulin of claim 9 , wherein the single chain insulin has a substitution of Gly, Ala, or Ser for Asn at position A21.
11. The single-chain insulin of claim 10 , wherein the single chain insulin has the amino acid sequence of any one of SEQ ID NOS: 8-14, 18-19, 23-29, 33-34, 37-44, 48-49 and 52-64.
12. The single-chain insulin of claim 11 , wherein the single chain insulin has a predicted isoelectric point below 5.0.
13. A pharmaceutical composition comprising a single-chain insulin formulated at a pH within the range 7.0 to 8.0, wherein the single chain insulin comprises:
a C-domain of from 6 to 11 amino acid residues comprising at least two acidic residues at the N-terminal side of the C-domain and at least two basic residues at the C-terminal side of the C-domain peptide, wherein the amino acids at the N-terminal side of the C-domain are the amino acids Glu-Glu;
a basic amino acid residue at the position corresponding to A8 of human insulin, and
an acidic amino acid residue at the position corresponding to A14 of human insulin.
14. The pharmaceutical composition of claim 13 , further comprising a pH buffer.
15. The pharmaceutical composition of claim 14 , wherein the single-chain insulin is formulated at a strength of between U-500 and U-1000.
16. The pharmaceutical composition of claim 15 , further comprising 2 to 4 zinc ions per insulin hexamer.
17. The pharmaceutical composition of claim 15 , further comprising less than 2 zinc ions per insulin hexamer.
18. The pharmaceutical composition of claim 13 , wherein the single-chain insulin is formulated at a concentration of 0.6 mM to 5.0 mM.
19. The pharmaceutical composition of claim 13 , wherein the single-chain insulin is formulated at a strength of U-100, U-200, U-300, U-400, or U-500.
20. A method for lowering the blood sugar level of a patient in need thereof, the method comprising, subcutaneously administering a pharmaceutical composition to the patient, wherein the pharmaceutical composition comprises a single-chain insulin formulated at a pH within the range 7.0 to 8.0, and wherein the single chain insulin comprises:
a C-domain of from 6 to 11 amino acid residues comprising at least two acidic residues at the N-terminal side of the C-domain and at least two basic residues at the C-terminal side of the C-domain peptide, wherein the amino acids at the N-terminal side of the C-domain are the amino acids Glu-Glu;
a basic amino acid residue at the position corresponding to A8 of human insulin, and
an acidic amino acid residue at the position corresponding to A14 of human insulin.