Abstract
Transfer of bacteria/yeast shuttle plasmids from Escherichia coli into the yeast species Kluyveromyces lactis, Pichia angusta ( Hansenula polymorpha), and Pachysolen tannophilus has been accomplished, presumably through inter-kingdom conjugal transfer. Plasmid pEK2 was transferred into a K. lactis mutant to complement trp auxotrophy, while plasmid YEp13 was mobilized into and complemented P. angusta and P. tannophilus Leu - auxotrophs. Plasmid DNA in the recipient strains was detected by transformation of E. coli with crude yeast cell extracts. Freely replicating plasmids without detectable alterations as well as plasmids with rearrangements were recovered from yeast transconjugants.
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