Abstract
The yeast Pichia ciferrii produces large quantities of the sphingoid base tetraacetyl phytosphingosine (TAPS) and is an interesting platform organism for the biotechnological production of sphingolipids and ceramides. Ceramides have attracted great attention as a specialty ingredient for moisture retention and protection of the skin in the cosmetics industry. First attempts have been started to metabolically engineer P. ciferrii for improved production of TAPS and other sphingoid bases. However, rational metabolic engineering of P. ciferrii is difficult due to a low gene targeting efficiency. In eukaryotes, two major pathways coexist, which are responsible for genomic DNA integration, homologous recombination (HR) and non-homologous end joining (NHEJ). Integration via HR is targeted, while NHEJ involves ectopic (non-targeted) integration depending on a ligation step mediated by DNA ligase IV (Lig4). Here, we demonstrate a dramatical increase in gene targeting efficiency in a P. ciferrii lig4 knockout strain, deficient in NHEJ. Furthermore, a quick and easy to use freeze–thaw method was developed to transform P. ciferrii with high efficiency. Owing to the ability of targeting genomic DNA integration our results pave the way for further genetic and metabolic engineering approaches with P. ciferrii by means of knocking out or overexpressing predestinated genes.
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Acknowledgment
We would like to thank Evonik Industries, the German Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung, BMBF; Bioindustrie 2021, “FerDi”) who supported this work, and Dr. Steffen Schaffer (Evonik Industries, Germany) for critically reading the manuscript and kindly providing the codon-optimized clonNAT cassette, the URA3 sequence, and the P. ciferrii codon usage table. Furthermore, we would like to thank Thomas E. Wilson (University of Michigan Medical School) and Stefan Åström (Stockholm University) for insightful discussions and comments regarding this work.
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Communicated by K. Breunig.
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Schorsch, C., Köhler, T. & Boles, E. Knockout of the DNA ligase IV homolog gene in the sphingoid base producing yeast Pichia ciferrii significantly increases gene targeting efficiency. Curr Genet 55, 381–389 (2009). https://doi.org/10.1007/s00294-009-0252-z
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DOI: https://doi.org/10.1007/s00294-009-0252-z