Abstract
Recombinant antibody fusion constructs with heterologous functional domains are a promising approach to new therapeutic targeting strategies. However, expression of such constructs is mostly limited to cost and labor-intensive mammalian expression systems. Here we report on the employment of Pichia pastoris for the expression of heterologous antibody fusion constructs with green fluorescent protein, A33scFv::GFP, or with cytosine deaminase, A33scFv::CDy, their production in a biofermenter and a modified purification strategy. Combined, these approaches improved production yields by about thirty times over established standard protocols, with extracellular secretion of the fusion construct reaching 12.0 mg/l. Bifunctional activity of the fusion proteins was demonstrated by flow cytometry and an in-vitro cytotoxicity assay. With equal amounts of purified protein, the modified purification method lead to higher functional results. Our results demonstrate the suitability of methylotrophic Pichia expression systems and laboratory-scale bioreactors for the production of high quantities of bifunctionally active heterologous single-chain fusion proteins.
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Acknowledgments
This work was supported by an Ernst-von-Leyden Stipendium of the Berliner Krebsgesellschaft to Vânia Coelho and by Deutsche Krebshilfe grant no. 1072981 to PMD.
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The authors declare that they have no competing interests.
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Panjideh, H., Coelho, V., Dernedde, J. et al. Production of bifunctional single-chain antibody-based fusion proteins in Pichia pastoris supernatants. Bioprocess Biosyst Eng 31, 559–568 (2008). https://doi.org/10.1007/s00449-008-0203-y
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DOI: https://doi.org/10.1007/s00449-008-0203-y