title: DNA cassettes containing the origin of transfer (oriT) of two broad-host-range transfer systems.
abstract: Plasmid constructs are described that carry retrievable DNA cassettes containing the origin of transfer region (oriT) from two broad-host-range plasmids. Restriction of these high copy number plasmids with any one of a variety of enzymes yields a linear DNA fragment of convenient size containing the oriT region of either pCUI or RK2. This DNA can be ligated into any vector or recombinant plasmid containing a compatible enzyme site and can be easily identified by size on an agarose gel. Any plasmid can therefore be mobilized using a number of helper strains or conjugative plasmids derived from the parental plasmids. In addition, the cassettes can be used for a variety of genetic manipulations including "selectable" linker mutagenesis.
authors.affiliation: Department of Biology, Carleton University, Ottawa, Ontario, Canada.
authors.forename: P N
authors.initials: PN
authors.lastname: Hengen
authors.forename: V N
authors.initials: VN
authors.lastname: Iyer
mesh_terms: D003001:Cloning, Molecular; D004269:DNA, Bacterial; D004926:Escherichia coli; D005821:Genetic Techniques; D010957:Plasmids; D015183:Restriction Mapping; D014162:Transfection / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial