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. 1992 Oct;174(20):6518–6526. doi: 10.1128/jb.174.20.6518-6526.1992

Complete nucleotide sequence of tbuD, the gene encoding phenol/cresol hydroxylase from Pseudomonas pickettii PKO1, and functional analysis of the encoded enzyme.

J J Kukor 1, R H Olsen 1
PMCID: PMC207615  PMID: 1400204

Abstract

The gene (tbuD) encoding phenol hydroxylase, the enzyme that converts cresols or phenol to the corresponding catechols, has been cloned from Pseudomonas pickettii PKO1 as a 26.5-kbp BamHI-cleaved DNA fragment, designated pRO1957, which allowed the heterogenetic recipient Pseudomonas aeruginosa PAO1c to grow on phenol as the sole source of carbon. Two subclones of pRO1957 carried in trans have shown phenol hydroxylase activity in cell extracts of P. aeruginosa. The nucleotide sequence was determined for one of these subclones, a 3.1-kbp HindIII fragment, and an open reading frame that would encode a peptide of 73 kDa was found. The size of this deduced peptide is consistent with the size of a novel peptide that had been detected in extracts of phenol-induced cells of P. aeruginosa carrying pRO1959, a partial HindIII deletion subclone of pRO1957. Phenol hydroxylase purified from phenol-plus-Casamino Acid-grown cells of P. aeruginosa carrying pRO1959 has an absorbance spectrum characteristic of a simple flavoprotein; moreover, the enzyme exhibits a broad substrate range, accommodating phenol and the three isomers of cresol equally well. Sequence comparisons revealed little overall homology with other flavoprotein hydroxylases, supporting the novelty of this enzyme, although three conserved domains were apparent.

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Selected References

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