title: [Isolation of recipient yeast strains for the stable reproduction of 2-micron DNA vectors].
abstract: Most Leu- clones of yeast transformants (cir0, pJDB219) can stabilize the replication of 2 micron-vectors with REP3, the stability obtained being comparable to the one for the standard cir0 strain. One of the Leu- clones was used to isolate a plasmid with Rep 1.2 functions ("Rep-helper plasmid"). The plasmid was shown to carry a partially active LEU2 gene by transforming both E. coli and S. cerevisiae to Leu+ phenotype. A restriction analysis performed demonstrated that the Rep-helper plasmid has lost approximately 1.9 kb compared to the parent pJDB219, deletion and rearrangement having taken place at the bacterial and 2 mem components boundary. The Rep-helper plasmid carrying host strains allows to quantify the REP3 function on different 2 microns vectors. Some but not all cir+ stabilized vectors show greater stability in Rep-helper strains compared to the standard cir0 ones. Manipulating the Rep-helper plasmid level, by selecting for Leu+ phenotype, stabilized REP3 +/- plasmid p3030, but mostly destabilizes REP3+ plasmid YEp13HIS3.
mesh_terms: D004262:DNA Restriction Enzymes; D004271:DNA, Fungal / Q000235:genetics*; D005822:Genetic Vectors; D010641:Phenotype; D010957:Plasmids; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D014170:Transformation, Genetic
chemical_list: D004271:DNA, Fungal; D004262:DNA Restriction Enzymes
vernacular_title: Poluchenie retsipientnykh drozhzhevykh shtammov dlia stabil'nogo vosproizvedeniia vektorov na osnove 2 mkm DNK.