title: [Study of the stability of hybrid plasmids replicating in Saccharomyces cerevisiae due to DNA fragments from polyoma virus].
abstract: Hybrid plasmid pSP97 carrying the entire genome of polyoma virus (PY), inserted into bacterial vector psV3, transforms yeast cells with the frequency 1 x 10(-2). Plasmid pSP97 is capable of autonomous replication in S. cerevisiae, while its structure remains unaltered, the stability of hybrid plasmid in transformants is 44%--100%. Plasmid pSP155 consisting of Ori-containing DNA segment from polyoma, pBR322 and yeast gene arg4, transforms yeast cells with the frequency 5 x 10(-3), the stability of plasmid in transformants is 23%--29%. Two types of plasmids were isolated from transformants: one was identical to SP155, while the another differed structurally and phenotypically from SP155. Plasmids pSP113 and pSP114, in addition to pBR322 and yeast gene arg4, contain a viral DNA segment that encodes genes from small and middle T-antigens. These plasmids transform yeast cells with low frequency (2 x 10(-4), 3 x 10(-5)), the stability of plasmids in yeast transformants is 100%. However, hybrid plasmids identical to pSP113 were isolated from transformants. Structural rearrangements have been observed in pSP114, which carries the arg4 gene in reversed orientation compared to pSP113.
mesh_terms: D002874:Chromosome Mapping; D004261:DNA Replication; D004262:DNA Restriction Enzymes; D004269:DNA, Bacterial / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics*; D004279:DNA, Viral / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D009693:Nucleic Acid Hybridization; D010957:Plasmids; D011120:Polyomavirus / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D014170:Transformation, Genetic; D014779:Virus Replication
chemical_list: D004269:DNA, Bacterial; D004271:DNA, Fungal; D004279:DNA, Viral; D004262:DNA Restriction Enzymes
vernacular_title: Izuchenie stabil'nosti gibridnykh plazmid, replitsiruiushchikhsia v Saccharomyces cerevisiae za schet fragmentov DNK virusa poliomy.