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. 1990 Aug;172(8):4571–4577. doi: 10.1128/jb.172.8.4571-4577.1990

Development of an integrative DNA transformation system for the yeast Candida tropicalis.

L O Haas 1, J M Cregg 1, M A Gleeson 1
PMCID: PMC213290  PMID: 2198267

Abstract

We developed the alkane and fatty-acid utilizing yeast Candida tropicalis as a host for DNA transformations. The system is based on an auxotrophic mutant host of C. tropicalis which is defective in orotidine monophosphate decarboxylase (ura3). The ura3 host was isolated by mutagenesis and a double-selection procedure that combined nystatin enrichment selection and 5-fluoro-orotic acid resistance selection. As a selectable marker, we isolated and characterized the C. tropicalis URA3 gene. Plasmid vectors that contained the C. tropicalis URA3 gene transformed the C. tropicalis mutant host at a frequency of 10(3) to 10(4) transformants per micrograms of plasmid DNA. Vectors that contained the Saccharomyces cerevisiae URA3 gene could not transform C. tropicalis. DNA transfer was accomplished by modified versions of either spheroplast generation (CaCl2-polyethylene glycol)-fusion or cation (LiCl) procedures developed for S. cerevisiae. Plasmid vectors that had been cut within the C. tropicalis URA3 fragment integrated by homologous recombination at the URA3 locus.

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Selected References

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