title: Characterization of a linear extrachromosomal DNA element (pBL1) isolated after interspecific mating between Streptomyces bambergiensis and S. lividans.
abstract: Streptomyces bambergiensis S712 harbours a giant linear plasmid PSB1 of 640 kb. After mating with the plasmidless S. lividans strain TK64, conjugants carrying a smaller extrachromosomal DNA element, pBL1, were identified. pBL1 is a 43-kb linear DNA molecule bound to a protein which protects it from attack by both 3'- and 5'-exonucleases. The absence of this protein drastically reduces the transforming efficiency of pBL1. pBL1 shares homology with linear plasmids and chromosomal DNA from S. bambergiensis strains.
authors.affiliation: Institute of Genetics, Moscow, Russia.
authors.forename: S B
authors.initials: SB
authors.lastname: Zotchev
authors.forename: L I
authors.initials: LI
authors.lastname: Soldatova
authors.forename: A V
authors.initials: AV
authors.lastname: Orekhov
authors.forename: H
authors.initials: H
authors.lastname: Schrempf
mesh_terms: D003227:Conjugation, Genetic / Q000235:genetics*; D004269:DNA, Bacterial / Q000235:genetics / Q000302:isolation & purification*; D004587:Electrophoresis, Agar Gel; D066298:In Vitro Techniques; D009693:Nucleic Acid Hybridization; D010957:Plasmids / Q000235:genetics*; D015183:Restriction Mapping; D013302:Streptomyces / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial