Capture purification processes for proteins expressed in a non-mammalian system

1. A method of purifying a protein expressed in a non-native soluble form in a non-mammalian expression system comprising:

(a) lysing a non-mammalian cell in which the protein is expressed in a nonnative soluble form to generate a cell lysate;

(b) contacting the cell lysate with a separation matrix under conditions suitable for the protein to associate with the separation matrix;

(c) washing the separation matrix; and

(d) eluting the protein from the separation matrix.

2. The method of claim 1 , wherein the protein is a complex protein.

3. The method of claim 2 , wherein the complex protein is selected from the group consisting of a multimeric protein, an antibody and an Fc fusion protein.

4. The method of claim 1 , wherein the non-mammalian expression system comprises bacteria or yeast cells.

5. The method of claim 1 , wherein the separation matrix is an affinity resin.

6. The method of claim 1 , wherein the separation matrix is a non-affinity resin selected from the group consisting of ion exchange, mixed mode, and a hydrophobic interaction resin.

7. The method of claim 1 , wherein the cell lysate is filtered before it is contacted with the separation matrix.

8. The method of claim 1 , further comprising refolding the protein to its native form after it is eluted.

9. A method of purifying a protein expressed in a non-native limited solubility form in a non-mammalian expression system comprising:

(a) solubilizing the expressed protein in a solubilization solution comprising one or more of the following:

(i) a denaturant;

(ii) a reductant; and

(iii) a surfactant;

(b) forming a refold solution comprising the solubilization solution and a refold buffer, the refold buffer comprising one or more of the following:

(i) a denaturant;

(ii) an aggregation suppressor;

(iii) a protein stabilizer; and

(iv) a redox component;

(c) applying the refold solution to a separation matrix under conditions suitable for the protein to associate with the matrix;

(d) washing the separation matrix; and

(e) eluting the protein from the separation matrix.

10. The method of claim 9 , wherein the non-native limited solubility form is a component of an inclusion body.

11. The method of claim 9 , wherein the protein is a complex protein.

12. The method of claim 10 , wherein the complex protein is selected from the group consisting of a multimeric protein, an antibody, a peptibody, and an Fc fusion protein.

13. The method of any one of claims 9 - 12 , wherein the non-mammalian expression system comprises bacteria or yeast cells.

14. The method of any one of claims 9 - 12 , wherein the denaturant of the solubilization solution or the refold buffer comprises one or more of urea, guanidinium salts, dimethyl urea, methylurea and ethylurea.

15. The method of claim 9 , wherein the reductant comprises one or more of cysteine, dithiothreitol (DTT), beta-mercaptoethanol and glutathione.

16. The method of claim 9 , wherein the surfactant comprises one or more of sarcosyl and sodium dodecylsulfate.

17. The method of claim 9 , wherein the aggregation suppressor is selected from the group consisting of arginine, proline, polyethylene glycols, nonionic surfactants, ionic surfactants, polyhydric alcohols, glycerol, sucrose, sorbitol, glucose, Tris, sodium sulfate, potassium sulfate and osmolytes.

18. The method of claim 9 , wherein the protein stabilizer comprises one or more of arginine, proline, polyethylene glycols, non-ionic surfactants, ionic surfactants, polyhydric alcohols, glycerol, sucrose, sorbitol, glucose, tris, sodium sulfate, potassium sulfate and osmolytes.

19. The method of claim 9 , wherein the redox component comprises one or more of glutathione-reduced, glutathione-oxidized, cysteine, cystine, cysteamine, cystamine and beta-mercaptoethanol.

20. The method of claim 9 , wherein the separation matrix is:

(i) an affinity resin, selected from the group consisting of Protein A, Protein G, and synthetic mimetic affinity resin; or

(ii) a non-affinity resin selected from the group consisting of ion exchange, mixed mode, and a hydrophobic interaction resin.

21. The method of any one of claim 1 or 9 - 12 , wherein the protein is isolated after elution from the separation matrix.

22. The method of claim 8 , wherein the protein is isolated after refolding.

23. The method of claim 14 , wherein the reductant comprises one or more of cysteine, dithiothreitol (DTT), beta-mercaptoethanol and glutathione.

24. The method of claim 15 , wherein the surfactant comprises one or more of sarcosyl and sodium dodecylsulfate.

25. The method of claim 16 , wherein the aggregation suppressor is selected from the group consisting of arginine, proline, polyethylene glycols, nonionic surfactants, ionic surfactants, polyhydric alcohols, glycerol, sucrose, sorbitol, glucose, Tris, sodium sulfate, potassium sulfate and osmolytes.

26. The method of claim 17 , wherein the protein stabilizer comprises one or more of arginine, proline, polyethylene glycols, non-ionic surfactants, ionic surfactants, polyhydric alcohols, glycerol, sucrose, sorbitol, glucose, tris, sodium sulfate, potassium sulfate and osmolytes.

27. The method of claim 18 , wherein the redox component comprises one or more of glutathione-reduced, glutathione-oxidized, cysteine, cystine, cysteamine, cystamine and beta-mercaptoethanol.

28. The method of claim 19 , wherein the separation matrix is:

(i) an affinity resin, selected from the group consisting of Protein A, Protein G, and synthetic mimetic affinity resin; or

(ii) a non-affinity resin selected from the group consisting of ion exchange, mixed mode, and a hydrophobic interaction resin.

29. The method of claim 13 , wherein the protein is isolated after elution from the separation matrix.

30. The method of claim 20 , wherein the protein is isolated after elution from the separation matrix.