Method for the production of polypeptides
First Claim
1. A method for the production of a heterologous short chain polypeptide in yeast, comprising (a) culturing a yeast having reduced activity of Yap 3 protease, said yeast being transformed with a hybrid vector comprising a yeast promoter operably linked to a DNA sequence coding for a polypeptide having up to 55 amino acids and having from 0 to 3 disulfide bonds in the structure, and (b) isolating said polypeptide, wherein said yeast produces said short-chain polypeptide in a yield at least about 2-fold higher than a yeast transformed with said hybrid vector having a wild-type level of Yap3 protease activity.
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Abstract
The present invention relates to a novel method for the production of short chain polypeptides, including polypeptides having up to 3 disulfide bonds and/or structures rich in basic amino acid residues, and open structured short chain polypeptides, e.g. glucagon, glucagon like peptides and their functional analogues, in genetically modified yeast cells, said genetically modified yeast cells, and a method for the preparation of said yeast cells.
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Citations
19 Claims
- 1. A method for the production of a heterologous short chain polypeptide in yeast, comprising (a) culturing a yeast having reduced activity of Yap 3 protease, said yeast being transformed with a hybrid vector comprising a yeast promoter operably linked to a DNA sequence coding for a polypeptide having up to 55 amino acids and having from 0 to 3 disulfide bonds in the structure, and (b) isolating said polypeptide, wherein said yeast produces said short-chain polypeptide in a yield at least about 2-fold higher than a yeast transformed with said hybrid vector having a wild-type level of Yap3 protease activity.
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16. A method for the production of a heterologous open structured short chain polypeptide in yeast, comprising (a) culturing a yeast having reduced activity of Yap3 protease, said yeast being transformed with a hybrid vector comprising a yeast promoter operably linked to a DNA sequence coding for a polypeptide having from 20-30 amino acids in the polypeptide chain, and having no more than one disulfide bonds in the structure, and (b) isolating said polypeptide, wherein said yeast produces said short-chain polypeptide in a yield at least about 2-fold higher than a yeast transformed with said hybrid vector having a wild-type level of Yap3 protease activity.
- 17. A culture of yeast cells containing a DNA sequence encoding a heterologous polypeptide having up to 55 amino acids in the polypeptide chain, and having from 0 to 3 disulfide bonds in the structure, and a second DNA sequense encoding a leader sequence causing said polypeptide to be secreted from the yeast, wherein said culture of yeast cells has reduced Yap3p activity and wherein said yeast produces said polypeptide in a yield at least about 2-fold higher than a yeast containing said DNA sequence and having a wild-type level of Yap3 protease activity.
Specification