title: Bacteriophage recombineering in the lytic state using the lambda red recombinases.
abstract: Bacteriophages, the historic model organisms facilitating the initiation of molecular biology, are still important candidates of numerous useful or promising biotechnological applications. Development of generally applicable, simple and rapid techniques for their genetic engineering is therefore a validated goal. In this article, we report the use of bacteriophage recombineering with electroporated DNA (BRED), for the first time in a coliphage. With the help of BRED, we removed a copy of mobile element IS1, shown to be active, from the genome of P1vir, a coliphage frequently used in genome engineering procedures. The engineered, IS-free coliphage, P1virdeltaIS, displayed normal plaque morphology, phage titre, burst size and capacity for generalized transduction. When performing head-to-head competition experiments, P1vir could not outperform P1virdeltaIS, further indicating that the specific copy of IS1 plays no direct role in lytic replication. Overall, P1virdeltaIS provides a genome engineering vehicle free of IS contamination, and BRED is likely to serve as a generally applicable tool for engineering bacteriophage genomes in a wide range of taxa.
authors.affiliation: Institute of Biochemistry, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary. fehert@brc.hu
authors.forename: Tamás
authors.initials: T
authors.lastname: Fehér
authors.forename: Ildikó
authors.initials: I
authors.lastname: Karcagi
authors.forename: Frederick R
authors.initials: FR
authors.lastname: Blattner
authors.forename: György
authors.initials: G
authors.lastname: Pósfai
mesh_terms: D017101:Bacteriophage P1 / Q000235:genetics*; D004251:DNA Transposable Elements; D005818:Genetic Engineering / Q000379:methods*; D045522:Recombinases / Q000235:genetics / Q000378:metabolism*; D011995:Recombination, Genetic; D017384:Sequence Deletion; D014161:Transduction, Genetic; D019562:Viral Load; D010948:Viral Plaque Assay; D014773:Virology / Q000379:methods*
chemical_list: D004251:DNA Transposable Elements; D045522:Recombinases