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Genetic transformation of the yeast Rhodotorula gracilis ATCC 26217 by electroporation

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Abstract

We examined the genetic transformation of the biotechnologically relevant yeast Rhodotorula gracilis ATCC 26217 by electroporation. To evaluate the yeast transformation, we created a genomic integration cassette that was targeted to the yeast orotidine-5′-phosphate decarboxylase gene (URA3 gene) locus and composed of the zeocin-resistant gene (Sh ble gene) with the URA3 promoter and terminator of the yeast. The yeast was unable to grow on medium containing 2.0 μg/mL zeocin, even with the inoculation of a large number of cells (approximately 1.0 × 108 cells/plate). Using the integrative cassette and zeocin-containing medium, we successfully obtained yeast transformants by electroporation, and the highest transformation efficiency of approximately 40 colony-forming units/μg DNA was obtained with a 0.6-kV electrical pulse. No homologous integration of the cassette at the URA3 gene locus was detected by the analyses of uracil auxotrophy and genomic PCR of transformants, suggesting that this method is a useful tool for randomly mutating the yeast genome.

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Takahashi, S., Okada, H., Abe, K. et al. Genetic transformation of the yeast Rhodotorula gracilis ATCC 26217 by electroporation. Appl Biochem Microbiol 50, 624–628 (2014). https://doi.org/10.1134/S0003683814110040

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