Process of producing non-naturally encoded amino acid containing high conjugated to a water soluble polymer
The present invention relates generally to the production, purification, and isolation of human growth hormone (hGH). More particularly, the invention relates to the production, purification, and isolation of substantially purified hGH from recombinant host cells or culture medium including, for example, yeast, insect, mammalian and bacterial host cells. The process of the present invention is also useful for purification of hGH linked to polymers or other molecules.
1. A process for producing a substantially purified human growth hormone (hGH) conjugated to a water soluble polymer at position 35 of SEQ ID NO: 2, comprising: a) culturing recombinant host cells capable of producing hGH comprising one or more non-naturally encoded amino acid(s) in a liquid nutrient medium containing the non-naturally encoded amino acid(s) under conditions which favor growth; b) producing hGH comprising the non-naturally encoded amino acid(s) in said cells; and c) producing substantially purified hGH polypeptide by conjugating said non-naturally encoded amino acid(s) in said hGH via an oxime bond to a water soluble polymer, wherein the non-naturally encoded amino acid has the structure:
and wherein the R group is any substituent other than one used in the twenty natural amino acids.
2. The process of claim 1 , wherein the process further comprises a step of purification prior to conjugation.
3. The process of claim 1 , wherein the process further comprises a step of purification following conjugation.
4. The process of claim 2 , wherein the water soluble polymer is poly(ethylene glycol).
5. The process of claim 1 , wherein said recombinant host cell is a prokaryotic cell.
6. The process of claim 1 , wherein said substantially purified hGH is selected from the group consisting of mature hGH, mature hGH variants, hGH polypeptides, and hGH polypeptide variants.
7. The process of claim 1 , wherein said process comprises an additional step after step c) of contacting the conjugated hGH with an anion exchange chromatography matrix under conditions that allow binding of the conjugated hGH to the matrix followed by elution and collection of the conjugated hGH from the anion exchange chromatography matrix.
8. The process of claim 1 , wherein said recombinant host cell is a eukaryotic cell.