Abstract
In terms of downstream processing efficiency, secretory expression systems offer potential advantages for the production of recombinant proteins, compared with inclusion body forming cytosolic systems. However, for high-volume therapeutics like insulin, the product yields of the majority of the potentially available secretory systems is not yet fully competitive. Current strategies to improve productivity and secretion efficiency comprise: (1) enhancement of gene expression rates, (2) optimization of secretion signal sequences, (3) coexpression of chaperones and foldases, (4) creation of protease deficient mutants to avoid premature product degradation and (5) subsequent breeding and mutagenesis. For the production of non-glycosylated proteins and proteins, which are natively glycosylated but are also pharmacologically active without glycosylation, prokaryotes, which usually lack metabolic pathways for glycosylation, are theoretically the most suitable organisms and offer two alternatives: either Escherichia coli strains are conditioned to be efficient secreters or efficient native secreters like Bacillus species are accordingly developed. To fully exploit the secretory capacity of fungal species, a deeper understanding of their posttranslational modification physiology will be necessary to steer the degree and pattern of glycosylation, which influences both folding and secretion efficiency. Insect and mammalian cells display posttranslational modification patterns very similar or identical to humans, but in view of the entailed expenditures, their employment can only be justified if their modification machinery is required to ensure a desired pharmacological activity.
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Schmidt, F.R. Recombinant expression systems in the pharmaceutical industry. Appl Microbiol Biotechnol 65, 363–372 (2004). https://doi.org/10.1007/s00253-004-1656-9
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DOI: https://doi.org/10.1007/s00253-004-1656-9