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Continuous Production of a Novel Lysozyme via Secretion from the Yeast, Pichia pastoris

Abstract

We have cloned a cDNA for bovine lysozyme c2, a novel lysozyme characteristic of the cow stomach and expressed its protein product by secretion using its native signal sequence in the methylotrophic yeast, Pichia pastoris. A semi–continuous fermentation process used for production resulted in extremely high cell densities and product concentrations. During fed–batch fermentation, bovine lysozyme concentrations exceeded 550 mg/liter, and cell densities exceeded 120 g dry cells/liter. In continuous culture, bovine lysozyme and cell concentrations remained constant at approximately 350 mg/liter and 100 g dry cells/liter, respectively. The recombinant product is a single biologically active species that constitutes >80% of the protein in media from expressing cells; the signal sequence of the pre–lysozyme is accurately processed.

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Digan, M., Lair, S., Brierley, R. et al. Continuous Production of a Novel Lysozyme via Secretion from the Yeast, Pichia pastoris. Nat Biotechnol 7, 160–164 (1989). https://doi.org/10.1038/nbt0289-160

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