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Highly-efficient electrotransformation of the yeast Hansenula polymorpha

Faber, K. N., Haima, P., Harder, W., Veenhuis, M. & AB, G., 1994, In : Current Genetics. 25, 4, 6 p.

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A highly-efficient method for transformation of the methylotrophic yeast Hansenula polymorpha has been developed. Routinely, transformation frequencies of up to 1.7 × 10^6/µg plasmid DNA were obtained by applying an electric pulse of the exponential decay type of 7.5 kV/cm to a highly-concentrated cell mixture during 5 ms. Efficient transformation was dependent on: (1) pretreatment of the cells with the reducing agent dithiotreitol, (2) the use of sucrose as an osmotic stabilizer in an ionic electroporation buffer, and (3) the use of cells grown to the mid-logarithmic phase. Important parameters for optimizing the transformation frequencies were field strength, pulse duration, and cell concentration during the electric pulse. In contrast to electrotransformation protocols described for Saccharomyces cerevisiae and Candida maltosa, transformation frequencies (transformants per µg DNA) for H. polymorpha remained high when large amounts (up to 10 µg) of plasmid DNA were added. This feature renders this procedure pre-eminently advantageous for gene cloning experiments when high numbers of transformants are needed.
Original languageEnglish
Number of pages6
JournalCurrent Genetics
Volume25
Issue number4
Publication statusPublished - 1994

    Keywords

  • Pichia methanolica, Hansenula polymorpha, Methylotrophic yeasts, Electroporation, Transformation

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