The PARS sequence increase the efficiency of stable Pichia pastoris transformation

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The methylotrophic yeast Pichia pastoris is a popular host for recombinant expression of proteins. Plasmids containing the Pichia autonomously replicating sequence (PARS) transform P. pastoris with higher efficiency than linear DNA equipped with termini designed for homologous recombination. Moreover, PARS containing constructs provide higher protein yields. Unfortunately, these autonomous plasmids are inherently unstable and the preferred method of P. pastoris transformation is therefore stable integration in the genome by homologous recombination. In the present study we report that a novel combination of PARS and linearization of plasmids for P. pastoris transformation serves to significantly increase the transformation efficiency. Moreover, it is demonstrated that the constructs do not re-circularize but integrate stably into the P. pastoris genome.

Original languageEnglish
JournalJournal of Microbiological Methods
Pages (from-to)1-7
Number of pages7
Publication statusPublished - 2016

    Research areas

  • Pichia pastoris, PARS, Transformation efficiency, Homologous recombination

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