A novel class of vector for yeast transformation.

We have constructed a set of hybrid yeast Escherichia coli vectors which utilise the site specific recombination function of the Saccharomyces cerevisiae 2 microns plasmid to completely eliminate the bacterial moiety upon introduction into yeast. A number of these plasmids have been shown to exhibit high inheritable stability in both laboratory and industrial strains during non-selective growth. These plasmids are beneficial for the genetic modification of industrial yeast, particularly those used in the production of food and beverages, and are of benefit in the study of plasmid maintenance and heterologous gene expression.