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Results An analysis of a series of haploid laboratory yeast strains revealed significant intra-strain variability and unstable plasmid segregation. By combining classic chemical mutagenesis and selection a family of highly efficient Saccharomyces cerevisiae strains has been developed for the commercial production of biopharmaceutical products. When combined with a stable [1], high copy number [2], episomal expression vector system and a strong constitutive promoter, secreted recombinant protein expression titres in excess of 4 g/L were achieved (see Figure 1). Specific genetic modifications to the host were also introduced to increase product yield and control posttranslational modifications, such as proteolysis and glycosylation.

Enhanced protein expression through strain selection, gene disruption, improved vector design and co-expression of endogenous chaperones