title: Direct selection cloning vectors adapted to the genetic analysis of gram-negative bacteria and their plasmids.
abstract: A range of specific and unusual biological pathways are found in Gram-negative bacteria. It is possible to express the genes involved in these processes in Escherichia coli, however, some genes prove lethal when cloned into high copy number vectors in common usage. Conversely, various genetic functions remain silent in E. coli and require to be transferred into their original host for expression and subsequent analysis. To facilitate the cloning and the characterisation of bacterial genes, we have constructed CcdB 'positive-selection' vectors that possess one or more of the following properties: (i) low or medium copy number; (ii) narrow or broad replication host range; (iii) conjugational mobilisation. In this communication, we illustrate the use of these new cloning tools and analyse the CcdB toxicity in different bacterial species.
authors.affiliation: Département de Biologie Moléculaire, Université Libre de Bruxelles, Rhode-Saint-Genèse, Belgium. pgabart@dbm.ulb.ac.be
authors.forename: P
authors.initials: P
authors.lastname: Gabant
authors.forename: C Y
authors.initials: CY
authors.lastname: Szpirer
authors.forename: M
authors.initials: M
authors.lastname: Couturier
authors.forename: M
authors.initials: M
authors.lastname: Faelen
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics*; D001427:Bacterial Toxins / Q000235:genetics*; D003001:Cloning, Molecular / Q000379:methods*; D005798:Genes, Bacterial; D005822:Genetic Vectors; D006090:Gram-Negative Bacteria / Q000235:genetics*; D010957:Plasmids
chemical_list: D001426:Bacterial Proteins; D001427:Bacterial Toxins; C068356:CcdB protein, Plasmid F