title: A gene-targeting suicide vector for Streptococcus bovis.
abstract: A gene-targeting suicide vector for Streptococcus bovis has been constructed using the Escherichia coli/Streptococcus shuttle plasmid, pMU1328, and a region derived from the broad host-range, Gram-positive transposon, Tn916. This suicide plasmid replicates autonomously in E. coli, but not in Strep. bovis or Strep. bovis Tn916. Under positive selection, the plasmid was shown to integrate into Strep. bovis Tn916 chromosomal DNA at a frequency of 3 x 10(-8) cell-1 and was stably maintained for at least 100 generations in the absence of selection. This is the first report of a recombination system in ruminal bacteria. The ability to target genes, knock out specific functions or introduce novel genes into these micro-organisms will allow ruminal species to be manipulated and may eventually lead to improved animal production.
authors.affiliation: Department of Animal Science, Waite Agricultural Research Institute, University of Adelaide, SA, Australia.
authors.forename: J D
authors.initials: JD
authors.lastname: Brooker
authors.forename: D K
authors.initials: DK
authors.lastname: Lum
authors.forename: A M
authors.initials: AM
authors.lastname: Thomson
authors.forename: H M
authors.initials: HM
authors.lastname: Ward
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics; D004261:DNA Replication; D004251:DNA Transposable Elements / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D018390:Gene Targeting / Q000379:methods*; D005822:Genetic Vectors / Q000235:genetics*; D016985:Streptococcus bovis / Q000235:genetics*; D013753:Tetracycline Resistance / Q000235:genetics; D014169:Transformation, Bacterial
chemical_list: D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; C083138:Tet M resistance protein, Bacteria