title: A circular plasmid from the yeast Torulaspora delbrueckii.
abstract: A new member of the 2-micron family of plasmids, named pTD1, was found in the yeast Torulaspora delbrueckii, a widespread yeast associated with food. Nucleotide sequences revealed the presence of a pair of inverted repeats and three open reading frames, one of which is a homologue of the FLP recombinase gene of 2-micron plasmid. An ARS region was identified, by replication in Saccharomyces cerevisiae and T. delbrueckii, near one of the inverted repeats. By the use of pTD1 derivatives and auxotrophic mutant hosts an efficient host-vector system was established for T. delbrueckii. So far, the 2-micron family of plasmids is restricted to four closely related genera (Q6 group): Saccharomyces, Zygosaccharomyces, Kluyveromyces, and Torulaspora. After a survey of 2500 strains belonging to about 500 species (80 genera) of yeast, no circular plasmids were found in other genera.
authors.affiliation: Institut Curie Section de Recherche, UMR 216, Centre Universitaire Paris XI, Orsay, France.
authors.forename: J
authors.initials: J
authors.lastname: Blaisonneau
authors.forename: F
authors.initials: F
authors.lastname: Sor
authors.forename: G
authors.initials: G
authors.lastname: Cheret
authors.forename: D
authors.initials: D
authors.lastname: Yarrow
authors.forename: H
authors.initials: H
authors.lastname: Fukuhara
mesh_terms: D001203:Ascomycota / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D004261:DNA Replication; D004271:DNA, Fungal; D005787:Gene Frequency; D005822:Genetic Vectors; D008969:Molecular Sequence Data; D010957:Plasmids
chemical_list: D004271:DNA, Fungal