title: A native plasmid of Pasteurella haemolytica serotype A1: DNA sequence analysis and investigation of its potential as a vector.
abstract: The complete nucleotide sequence of a 4.3 kilobase pair plasmid, pAB2, isolated from a bovine strain of Pasteurella haemolytica serotype A1, was determined. It encodes a Rob-1 type beta-lactamase and a region with homology to the mobilisation (mob) region of the Escherichia coli plasmid, ColE1. An insertion mutant of pAB2 (pTC2/81) carrying a copy of Tn5 was transferred to E coli K12 by conjugation. Subsequently pTC2/81 could be transferred by transformation to E coli HB101, but not to P haemolytica serotypes A1 or A2. However, a derivative of this construct containing only a fragment of the Tn5 insertion sequence was able to transform P haemolytica. A further construct containing a fragment of the P haemolytica A1 leucotoxin A gene, was similarly restricted to transforming E coli. These results demonstrate that the pAB2 plasmid is capable of acting as an E coli/P haemolytica shuttle vector. However, the nature of the cloned DNA sequences are important to transformation.
authors.affiliation: Moredun Research Institute, Edinburgh.
authors.forename: A R
authors.initials: AR
authors.lastname: Wood
authors.forename: F A
authors.initials: FA
authors.lastname: Lainson
authors.forename: F
authors.initials: F
authors.lastname: Wright
authors.forename: G D
authors.initials: GD
authors.lastname: Baird
authors.forename: W
authors.initials: W
authors.lastname: Donachie
mesh_terms: D001483:Base Sequence; D004251:DNA Transposable Elements / Q000235:genetics; D004587:Electrophoresis, Agar Gel; D005822:Genetic Vectors / Q000235:genetics*; D016978:Mannheimia haemolytica / Q000145:classification / Q000235:genetics*; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics*; D017422:Sequence Analysis, DNA; D012703:Serotyping
chemical_list: D004251:DNA Transposable Elements