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. 1990 Aug;172(8):4624–4630. doi: 10.1128/jb.172.8.4624-4630.1990

Molecular cloning, characterization, and regulation of a Pseudomonas pickettii PKO1 gene encoding phenol hydroxylase and expression of the gene in Pseudomonas aeruginosa PAO1c.

J J Kukor 1, R H Olsen 1
PMCID: PMC213297  PMID: 2115872

Abstract

A 26-kilobase BamHI restriction endonuclease DNA fragment was cloned from Pseudomonas pickettii PKO1, a strain isolated from a soil microcosm that had been amended with benzene, toluene, and xylene. This DNA fragment, cloned into vector plasmid pRO1727 and designated pRO1957, allowed Pseudomonas aeruginosa PAO1c to grow on phenol as the sole source of carbon. Physical and functional restriction endonuclease maps have been derived for the cloned DNA fragment. Two DNA fragments carried in trans and derived from subclones of pRO1957 show phenol hydroxylase activity in cell extracts of P. aeruginosa. Deletion and subcloning analyses of these fragments indicated that the gene encoding phenol hydroxylase is positively regulated. Phenol and m-cresol were shown to be inducers of the enzyme. o-Cresol and p-cresol did not induce enzymatic activity but could be metabolized by cells that had been previously exposed to phenol or m-cresol; moreover, the enzyme exhibited a rather broad substrate specificity and was sensitive to thiol-inhibiting reagents. A novel polypeptide with an estimated molecular mass of 80,000 daltons was detected in extracts of phenol-induced cells of P. aeruginosa carrying plasmid pRO1959.

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Selected References

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