Plasmid–Transformed ura3 fur1 Double-Mutants of S. cerevisiae: An Autoselection System Applicable to the Production of Foreign Proteins

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Simple auxotrophic mutants of S. cerevisiae transformed to prototrophy via plasmid DNA must be grown in media in which cured cells are counter–selected. This restricts the choice of the medium to those whose composition is compatible with the selection. These media are generally not comparable with the cheap, complex media used by industry for the production of yeast cells. We report a new selection system that enables the growth of plasmid–transformed yeast cells for the production of foreign proteins in complex media. The recipient strains are double–mutants (ura3 fur1) whose viability is strictly linked to the presence of a plasmid encoding a functional orotidine–5′–phosphate decarboxylase (OMP decase). We show that these strains can produce high levels of a plasmid–encoded foreign protein (namely human α1–antitrypsin) in various complex media, including those used by industry, for many generations without any detectable loss of the plasmid–linked phenotype.

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Loison, G., Nguyen-Juilleret, M., Alouani, S. et al. Plasmid–Transformed ura3 fur1 Double-Mutants of S. cerevisiae: An Autoselection System Applicable to the Production of Foreign Proteins. Nat Biotechnol 4, 433–437 (1986) doi:10.1038/nbt0586-433

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