ArticleApplied and environmental microbiology2012
Recombinogenic properties of Pyrococcus furiosus strain COM1 enable rapid selection of targeted mutants.
Article in Applied and environmental microbiology, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers.
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38 citing papers in PubMed, 58 citations in OpenAlex.
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
Abstract
We recently reported the isolation of a mutant of Pyrococcus furiosus, COM1, that is naturally and efficiently competent for DNA uptake. While we do not know the exact nature of this mutation, the combined transformation and recombination frequencies of this strain allow marker replacement by direct selection using linear DNA. In testing the limits of its recombination efficiency, we discovered that marker replacement was possible with as few as 40 nucleotides of flanking homology to the target region. We utilized this ability to design a strategy for selection of constructed deletions using PCR products with subsequent excision, or "pop-out," of the selected marker. We used this method to construct a "markerless" deletion of the trpAB locus in the GLW101 (COM1 ΔpyrF) background to generate a strain (JFW02) that is a tight tryptophan auxotroph, providing a genetic background with two auxotrophic markers for further strain construction. The utility of trpAB as a selectable marker was demonstrated using prototrophic selection of plasmids and genomic DNA containing the wild-type trpAB alleles. A deletion of radB was also constructed that, surprisingly, had no obvious effect on either recombination or transformation, suggesting that its gene product is not involved in the COM1 phenotype. Attempts to construct a radA deletion mutation were unsuccessful, suggesting that this may be an essential gene. The ease and speed of this procedure will facilitate the construction of strains with multiple genetic changes and allow the construction of mutants with deletions of virtually any nonessential gene.
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