title: High frequency of yeast transformation by plasmids carrying part or entire 2-micron yeast plasmid.
abstract: By using two chimeric plasmids containing yeast ura3 gene and 2-micron yeast DNA linked to the bacterial plasmid pCR1, yeast transformation of a high frequency has been achieved. The first plasmid is such that the 2-micron DNA part, in which the ura3 gene is incorporated, can be removed in one step and thus the 2-micron-ura3 sequence can be considered as a "transposable" block. In contrast, the second one bears the entire 2-micron plasmid and the ura3 gene is inserted in the bacterial plasmid part. As shown through hybridization experiments and genetic studies, the ura3 gene was maintained as a cytoplasmic element. Plasmids recovered from the yeast transformants were used to transform Escherichia coli. Their analysis by EcoRI showed that in many cases the vector had recombined with the endogenous 2-micron DNA of the recipient strain. The specific activity of orotidine 5'-monophosphate decarboxylase (coded by ura3) in yeast transformants was 10- to 30-fold higher than in the wild type.
mesh_terms: D002678:Chimera; D004247:DNA / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics; D004274:DNA, Recombinant; D004926:Escherichia coli / Q000235:genetics; D010957:Plasmids; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D014170:Transformation, Genetic; D014498:Uracil / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D004274:DNA, Recombinant; D014498:Uracil; D004247:DNA