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. 1980 Sep;143(3):1179–1186. doi: 10.1128/jb.143.3.1179-1186.1980

Genetic analysis of Saccharomyces cerevisiae transformed by plasmid containing a supressor transfer ribonucleic acid gene.

D Y Thomas, A P James
PMCID: PMC294473  PMID: 6997266

Abstract

The behavior in Saccharomyces cerevisiae of plasmid pYTE1, which contains yeast tyrosine-inserting ochre suppressor SUP4.o, a 4-kilobase EcoRI fragment of yeast 2muDNA, and the bacterial plasmid pBR322, has been studied. Selection of yeast transformants was by suppression of multiple ochre mutations. About 10(3) to 10(4) transformants per microgram of pYTE1 dfeoxyribonucleic acid were obtained. The majority of transformants contained both an integrated copy of the SUP4.o gene plus pBR322 deoxyribonucleic acid sequences and autonomously replicating forms of the plasmid. The integrated copy was extremely stable mitotically and meiotically, but the associated nonintegrated copies were lost at meiosis. The chromosomally integrated pBR322 sequences were linked to the SUP4.o gene. The integration site was at the SUP4+ locus. In transformants with only nonintegrated copies of pYTE1, the expression of suppression was reduced, and the plasmid was unstable in mitosis. Plasmid deoxyribonucleic acid preparations from both types of transformant could be used to retransform yeast cells. Plasmid pYTE1 has restriction enzyme sites useful for the high frequency and stable transformation of other genes into yeasts. The potential uses of this plasmid for transformation of other organisms is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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