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Yarrowia lipolytica morphological mutant enables lasting in situ immobilization in bioreactor

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Abstract

In the present study, we have isolated and characterized a Yarrowia lipolytica morphological mutant growing exclusively in the pseudohyphal morphology. The gene responsible for this phenotype, YALI0E06519g, was identified as homologous to the mitosis regulation gene HSL1 from Saccharomyces cerevisiae. Taking advantage of its morphology, we achieved the immobilization of the Δhsl1 mutant on the metallic structured packing of immobilized-cell bioreactors. We obtained significant cell retention and growth on the support during shake flask and bioreactor experiments without an attachment step prior to the culture. The system of medium aspersion on the packing ensured oxygen availability in the absence of agitation and minimized the potential release of cells in the culture medium. Additionally, the metallic packing proved its facility of cleaning and sterilization after fermentation. This combined use of morphological mutation and bioreactor design is a promising strategy to develop continuous processes for the production of recombinant protein and metabolites using Y. lipolytica.

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Acknowledgements

M. Vandermies and F. Carly are recipients of a fellowship from the Fonds pour la Formation à la Recherche dans l’Industrie et l’Agriculture (FRIA).

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Correspondence to Patrick Fickers.

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

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The authors declare that they have no conflict of interest.

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Vandermies, M., Kar, T., Carly, F. et al. Yarrowia lipolytica morphological mutant enables lasting in situ immobilization in bioreactor. Appl Microbiol Biotechnol 102, 5473–5482 (2018). https://doi.org/10.1007/s00253-018-9006-5

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  • DOI: https://doi.org/10.1007/s00253-018-9006-5

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