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. 1988 Oct;170(10):4458–4465. doi: 10.1128/jb.170.10.4458-4465.1988

Cloning and expression of the catA and catBC gene clusters from Pseudomonas aeruginosa PAO.

J J Kukor 1, R H Olsen 1, D P Ballou 1
PMCID: PMC211477  PMID: 3139626

Abstract

A 9.9-kilobase (kb) BamHI restriction endonuclease fragment encoding the catA and catBC gene clusters was selected from a gene bank of the Pseudomonas aeruginosa PAO1c chromosome. The catA, catB, and catC genes encode enzymes that catalyze consecutive reactions in the catechol branch of the beta-ketoadipate pathway: catA, catechol-1,2-dioxygenase (EC 1.13.11.1); catB, muconate lactonizing enzyme (EC 5.5.1.1); and catC, muconolactone isomerase (EC 5.3.3.4). A recombinant plasmid, pRO1783, which contains the 9.9-kb BamHI restriction fragment complemented P. aeruginosa mutants with lesions in the catA, catB, or catC gene; however, this fragment of chromosomal DNA did not contain any other catabolic genes which had been placed near the catA or catBC cluster based on cotransducibility of the loci. Restriction mapping, deletion subcloning, and complementation analysis showed that the order of the genes on the cloned chromosomal DNA fragment is catA, catB, catC. The catBC genes are tightly linked and are transcribed from a single promoter that is on the 5' side of the catB gene. The catA gene is approximately 3 kb from the catBC genes. The cloned P. aeruginosa catA, catB, and catC genes were expressed at basal levels in blocked mutants of Pseudomonas putida and did not exhibit an inducible response. These observations suggest positive regulation of the P. aeruginosa catA and catBC cluster, the absence of a positive regulatory element from pRO1783, and the inability of the P. putida regulatory gene product to induce expression of the P. aeruginosa catA, catB, and catC genes.

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Selected References

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