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. 1985 Nov;164(2):887–895. doi: 10.1128/jb.164.2.887-895.1985

Evolutionary conservation of genes coding for meta pathway enzymes within TOL plasmids pWW0 and pWW53.

H Keil, S Keil, R W Pickup, P A Williams
PMCID: PMC214335  PMID: 2997136

Abstract

Pseudomonas putida MT53 contains a TOL plasmid, pWW53, that encodes toluene-xylene catabolism. pWW53 is nonconjugative, is about 105 to 110 kilobase pairs (kbp) in size, and differs significantly in its restriction endonuclease digestion pattern and incompatibility group from the archetypal TOL plasmid pWW0. An RP4::pWW53 cointegrate plasmid, pWW53-4, containing about 35 kbp of pWW53 DNA, including the entire catabolic pathway genes, was formed, and a restriction map for KpnI, HindIII, and BamHI was derived. The entire regulated meta pathway genes for the catabolism of m-toluate were cloned into pKT230 from pWW53 on a 17.5-kbp HindIII fragment. The recombinant plasmid supported growth on m-toluate when mobilized into plasmid-free P. putida PaW130. A restriction map of the insert for 10 restriction enzymes was derived, and the locations of xylD, xylL, xylE, xylG, and xylF were determined by subcloning and assaying for their gene products in both Escherichia coli and P. putida hosts. Good induction of the enzymes by m-toluate and m-methylbenzyl alcohol but not by m-xylene was measured in P. putida, but little or no regulation was found in E. coli. The restriction map and the gene order showed strong similarities with published maps of the DNA encoding both the entire meta pathway operon (xylDLEGFJIH) and the regulatory genes xylS and xylR on the archetype TOL plasmid pWW0, suggesting a high degree of conservation in DNA structure for the catabolic operon on the two different plasmids.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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