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A general system to integratelacZ fusions into the chromosomes of gram-negative eubacteria: regulation of thePm promoter of theTOL plasmid studied with all controlling elements in monocopy

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Summary

A new procedure is described to recombine plasmid-bornelacZ fusions into the chromosome of gram-negative eubacteria in order to study promoter activity in monocopy. The procedure is based upon the insertion into the chromosome of a target bacterium of a recombinant transposon that carries DNA sequence homology to the regions flankinglacZ fusions present in multicopy promotor-probe vectors, which can be mobilized via RP4-mediated transfer but are unable to replicate in non-enteric bacteria. Double recombination between the promoter-probe vectors and the chromosomal homology region of the transposon is genetically selected by reconstruction and expression of wild-type sequences from truncatedlacZ andaadA (streptomycin/spectinomycin) resistance genes in the homology fragment and from an amber mutation carryinglacZ andaadA genes present in the plasmid vectors. The structure of desired clones is confirmed by screening for loss of the transposon-encoded kanamycin resistance marker. We have used this procedure to assemble in monocopy inPseudomonas putida the regulatory elements controlling expression of the Xy1S-activatedPm promoter of the TOL catabolic plasmid pWWO. We show here that thePm promoter undergoes a Xy1S-independent, strictly growth-phase-controlled activation by benzoate but not meta-toluate. In the presence of XylS, however, activation by both effectors involves a combination of growth phase-dependent and -independent controls.

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Authors and Affiliations

  1. GBF-National Research Centre for Biotechnology, 3300, Braunschweig, Germany

    Birgit Kessler & Kenneth N. Timmis

  2. Centro de Investigaciones Biológicas CSIC, Veázquez 144, E-28006, Madrid, Spain

    Victor de Lorenzo

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  1. Birgit Kessler
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  2. Victor de Lorenzo
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  3. Kenneth N. Timmis
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Kessler, B., de Lorenzo, V. & Timmis, K.N. A general system to integratelacZ fusions into the chromosomes of gram-negative eubacteria: regulation of thePm promoter of theTOL plasmid studied with all controlling elements in monocopy. Molec. Gen. Genet. 233, 293–301 (1992). https://doi.org/10.1007/BF00587591

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  • DOI: https://doi.org/10.1007/BF00587591

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