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- W2781978265 abstract "Abstract Pseudomonas putida is a promising bacterial host for producing natural products, such as polyketides and nonribosomal peptides. In these types of projects, researchers need a genetic toolbox consisting of plasmids, characterized promoters, and techniques for rapidly editing the genome. Past reports described constitutive promoter libraries, a suite of broad host range plasmids that replicate in P. putida, and genome-editing methods. To augment those tools, we have characterized a set of inducible promoters and discovered that IPTG-inducible promoter systems have poor dynamic range due to overexpression of the LacI repressor. By replacing the promoter driving lacI expression with weaker promoters, we increased the fold induction of an IPTG-inducible promoter in P. putida KT2440 to 80-fold. Upon discovering that gene expression from a plasmid was unpredictable when using a high-copy mutant of the BBR1 origin, we determined the copy numbers of several broad host range origins and found that plasmid copy numbers are significantly higher in P. putida KT2440 than in the synthetic biology workhorse, Escherichia coli. Lastly, we developed a λRed/Cas9 recombineering method in P. putida KT2440 using the genetic tools that we characterized. This method enabled the creation of scarless mutations without the need for performing classic two-step integration and marker removal protocols that depend on selection and counterselection genes. With the method, we generated four scarless deletions, three of which we were unable to create using a previously established genome-editing technique." @default.
- W2781978265 created "2018-01-12" @default.
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- W2781978265 date "2018-07-01" @default.
- W2781978265 modified "2023-10-08" @default.
- W2781978265 title "Genetic tools for reliable gene expression and recombineering in <i>Pseudomonas putida</i>" @default.
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- W2781978265 doi "https://doi.org/10.1007/s10295-017-2001-5" @default.
- W2781978265 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6161825" @default.
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