Method for preparing a site-specific physiologically active polypeptide conjugate

1. A method for preparing a site-specific physiologically active polypeptide conjugate, comprising the steps of:

i) determining a kind and an amount of a first alcohol and a pH range where a target site conjugate exist more than a non-target site conjugate by identifying a ratio of the target site conjugate and non-target site conjugate , depending on the change of the kind and the amount of the first alcohol and pH in a reaction medium, wherein the target site conjugate is a conjugate of a physiologically active polypeptide and a non-peptidyl polymer, said non-peptidyl polymer binding to a target amino acid residue of the physiologically active polypeptide, and wherein the non-target site conjugate is a conjugate of a physiologically active polypeptide and a non-peptidyl polymer, said non-peptidyl polymer binding to an amino acid residue other than the target amino acid residue of the physiologically active polypeptide;

ii) reacting the physiologically active polypeptide with the non-peptidyl polymer in a reaction medium having the kind and the amount of the first alcohol and the pH range determined in step i); and

iii) isolating and purifying the physiologically active polypeptide conjugate from the reaction mixture of step ii) by ion exchange chromatography using a second alcohol,

wherein the non-peptidyl polymer is selected form the group consisting of polyethylene glycol, polypropylene glycol, copolymers of ethylene glycol and propylene glycol, polyoxyethylated polyols, polyvinyl alcohol, polysaccharides, dextran, polyvinyl ethyl ether, poly(lactic acid), polylactic-glycolic acid, lipid polymers, chitins, hyaluronic acid, and combinations thereof; and

wherein the non-peptidyl polymer has a reactive aldehyde, propionaldehyde or butyraldehyde group at both ends thereof.

2. The method of claim 1 , wherein the physiologically active polypeptide is selected from the group consisting of insulinotropic peptide, blood factor, digestive hormone, adrenocorticotropic hormone, thyroid hormone, intestinal hormone, cytokine, enzyme, growth factor, neuropeptide, hypophyseotropic hormone, hypophysiotropic hormone, anti-obesity peptide, and anti-viral peptide.

3. The method of claim 1 , wherein the physiologically active polypeptide is selected from the group consisting of erythropoietin, granulocyte macrophage-colony stimulating factor, amylin, glucagon, insulin, somatostatin, peptide YY, neuropeptide Y, glucagon-like peptide 1, glucagon-like peptide 2, exendin-4, oxyntomodulin, ghrelin, angiotensin, bradykinin, calcitonin, corticotropin, eledoisin, gastrin, leptin, oxytocin, vasopressin, luteinizing hormone, prolactin, follicle stimulating hormone, parathyroid hormone, secretin, sermorelin, human growth hormone, growth hormone-releasing peptide, granulocyte colony stimulating factor, interferons, interleukins, prolactin-releasing peptide, orexin, thyroid-releasing peptide, cholecystokinin, gastrin-inhibiting peptide, calmodulin, gastrin-releasing peptide, motilin, vasoactive intestinal peptide, atrial natriuretic peptide, brain natriuretic peptide, C-type natriuretic peptide, neurokinin A, neuromedin, renin, endothelin, sarafotoxin peptide, carsomorphin peptide, dermorphin, dynorphin, endorphin, enkepalin, T cell factor, tumor necrosis factor, tumor necrosis factor receptor, urokinase receptor, tumor inhibitory factor, collagenase inhibitor, thymopoietin, thymulin, thymopentin, tymosin, thymic humoral factor, adrenomodullin, allatostatin, amyloid beta-protein fragment, antimicrobial peptide, antioxidant peptide, bombesin, osteocalcin, CART peptide, E-selectin, intercellular adhesion molecule 1, vascular cell adhesion molecule 1, leucokine, kringle-5, laminin, inhibin, galanin, fibronectin, pancreastatin, and fuzeon.

4. The method of claim 1 , wherein the physiologically active polypeptide is an exendin, insulin, glucagon-like peptide 1, glucagon-like peptide 2, oxyntomodulin, ghrelin, or calcitonin.

5. The method of claim 4 , wherein the physiologically active polypeptide is an exendin, oxyntomodulin, glucagon-like peptide 1, or glucagon-like peptide 2, each having any structure selected from Formulas (I) to (IV):

wherein the peptide is exendin, oxyntomodulin, glucagon-like peptide 1, or glucagon-like peptide 2.

6. The method of claim 1 , wherein the alcohol used in steps (i) and (ii) is primary, secondary, or tertiary alcohol having a carbon number of one to ten.

7. The method of claim 6 , wherein the alcohol is ethanol or isopropanol.

8. The method of claim 1 , wherein the alcohol is present in the reaction medium, in an amount of 35% to 60% by volume, based on the total amount of the reaction medium.

9. The method of claim 1 , wherein the pH employed in step (i) is 7.0 to 10.0, when the physiologically active polypeptide is an exendin or a derivative thereof.

10. The method of claim 1 , wherein the pH employed in step (i) is 7.0 to 10.0, when the physiologically active polypeptide is oxyntomodulin or a derivative thereof.

11. The method of claim 1 , wherein the pH employed in step (i) is 4.0 to 10.0, when the physiologically active polypeptide is human insulin or a derivative thereof.

12. The method of claim 1 , wherein the pH employed in step (i) is 7.0 to 10.0, when the physiologically active polypeptide is glucagon-like peptide 1 or a derivative thereof.

13. The method of claim 1 , wherein the pH employed in step (i) is 7.0 to 10.0, when the physiologically active polypeptide is a glucagon-like peptide 2 or a derivative thereof.

14. The method of claim 1 , wherein the site-specific physiologically active polypeptide conjugate is an exendin-4 conjugate in which PEG is linked to Lys27 of SEQ ID NO: 1, a calcitonin conjugate in which PEG is linked to the N-terminal, an oxyntomodulin conjugate in which PEG is linked to Lys27 or Lys30 of SEQ ID NO: 2, human insulin conjugate in which PEG is linked to the N-terminal of Glyl in insulin A chain of SEQ ID NO: 3, or is linked to Lys29 in insulin B-chain of SEQ ID NO: 4, a glucagon-like peptide 1 conjugate in which PEG is linked to Lys34 of SEQ ID NO: 5, or a glucagon-like peptide 2 conjugate in which PEG is linked to Lys30 of SEQ ID NO: 6.

15. The method of claim 1 , wherein the non-peptidyl polymer is polyethtylene glycol.