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Design of a novel switchable antibody display system in Pichia pastoris

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Abstract

Yeast surface display (YSD) has been shown to represent a powerful tool in the field of antibody discovery and engineering as well as for selection of high producer clones. However, YSD is predominantly applied in Saccharomyces cerevisiae, whereas expression of heterologous proteins is generally favored in the non-canonical yeast Pichia pastoris (Komagataella phaffii). Establishment of surface display in P. pastoris would therefore enable antibody selection and expression in a single host. Here we describe the generation of a Pichia surface display (PSD) system based on antibody expression from episomal plasmids. By screening a diverse set of expression vectors using Design of Experiments (DoE), the effect of different genetic elements on the surface expression of antibody fragments was analyzed. Among the tested genetic elements, we found that the combination of P. pastoris formaldehyde dehydrogenase (FLD1) promoter, S. cerevisiae invertase 2 signal peptide (SUC2), and α-agglutinin cell wall protein (SAG1) including an autonomously replicating sequence of Kluyveromyces lactis (panARS) were contributing most strongly to higher display levels of three tested antibody fragments. Employing this combination resulted in the display of antibody fragments for up to 25% of cells. Despite significantly reduced expression levels in PSD compared to well-established YSD in S. cerevisiae, similar fractions of antigen binding single-chain variable fragments (scFvs) were observed (80% vs. 84%). In addition, plasmid stability assays and flow cytometric analysis demonstrated the efficient plasmid clearance of cells and associated loss of antibody fragment display after removal of selective pressure.

Key points

• First report of antibody display in P. pastoris using episomal plasmids.

• Identification of genetic elements conferring highest levels of antibody display.

• Comparable antigen binding capacity of displayed scFvs for PSD compared to YSD.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We would like to thank Jan Drewes (Miltenyi Biotec) for establishing various laboratory automation protocols and providing useful input during troubleshooting. In addition, we are grateful to Marius Terfrüchte, Alexandra Schmitz, and Sven Karstaedt (Miltenyi Biotec) for the transfer of P. pastoris cells and for supporting the work in this study.

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Authors

Contributions

Conceived and designed the experiments: DG, FT and JCD. Performed the experiments: DG. Analyzed the data: DG, FT, JCD, MD, and VN. Wrote the paper: DG and MD. Reviewed and edited the manuscript: VN and MW. All authors read and approved the manuscript.

Corresponding author

Correspondence to Marek Wieczorek.

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This article does not contain any studies with human participants or animals performed by any of the authors.

Competing interests

DG, FT, JCD, MD, VN, and MW are employees of Miltenyi Biotec B.V. & Co. KG. DG has relevant IP to the findings disclosed. No relevant financial or non-financial interests exist for the remaining authors.

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Gätjen, D., Tomszak, F., Dettmann, JC. et al. Design of a novel switchable antibody display system in Pichia pastoris. Appl Microbiol Biotechnol 106, 6209–6224 (2022). https://doi.org/10.1007/s00253-022-12108-5

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  • DOI: https://doi.org/10.1007/s00253-022-12108-5

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