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. 1989 Apr;55(4):771–777. doi: 10.1128/aem.55.4.771-777.1989

Differential regulation of lambda pL and pR promoters by a cI repressor in a broad-host-range thermoregulated plasmid marker system.

C Winstanley 1, J A Morgan 1, R W Pickup 1, J G Jones 1, J R Saunders 1
PMCID: PMC184201  PMID: 2729979

Abstract

Plasmid systems with unique markers were constructed to assess the fate of recombinant DNA and genetically manipulated bacteria in soil and freshwater model environments. On such constructs the marker gene, xylE (for catechol 2,3-dioxygenase), is expressed from the lambda promoter pL or pR, each of which is controlled by the temperature-sensitive lambda repressor c1857. Combinations of these elements were cloned into the broad-host-range plasmid pKT230 to form pLV1010 (pL-xylE), pLV1011 (pL-xylE-c1857), and pLV1013 (pR-xylE-c1857). The recombinant plasmids were introduced into different gram-negative bacteria. The thermoregulated system of pLV1013 functioned well in a range of species, with xylE induction being readily achieved by elevation of the temperature from 28 to 37 degrees C. There was a difference in the induction of catechol 2,3-dioxygenase activity, depending on whether xylE was expressed from pL (pLV1011) or pR (pLV1013). Our observations on testing the different systems in a number of hosts suggest that genes carried by the DNA of genetically engineered microorganisms may not be expressed in a predictable manner following transfer from the release host to other species.

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Selected References

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