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Environ Microbiol. 2004 Jul;6(7):726-32.

Mini-Tn7 transposons for site-specific tagging of bacteria with fluorescent proteins.

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Molecular Microbial Ecology Group, Centre for Biomedical Microbiology, BioCentrum-DTU, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.


The mini-Tn7 transposon system is a convenient tool for site-specific tagging of bacteria in which the tagging DNA is inserted at a unique and neutral chromosomal site. We have expanded the panel of mini-Tn7 delivery plasmids expressing different fluorescent proteins (stable and unstable) from the Escherichia coli lac derived promoter, P(A1/04/03), or from the growth-rate-dependent Escherichia coli promoter PrrnB P1. The mini-Tn7 transposons were inserted and tested in the soil bacterium, Pseudomonas putida KT2440. Successful and site-specific tagging was verified by Southern blots as well as by PCR. Furthermore, the effect of fluorescent protein expression on the cellular growth rate was tested by growth competition assays.

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