Ghadi SC, Sangodkar UM. Identification of a meta-cleavage pathway for metabolism of phenoxyacetic acid and phenol in Pseudomonas cepacia AC1100.
Biochem Biophys Res Commun 1994;
204:983-93. [PMID:
7526858 DOI:
10.1006/bbrc.1994.2557]
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Abstract
Pseudomonas cepacia strain AC1100 grows luxuriantly on 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) but does not utilize phenoxyacetic acid. After long-term selective pressure on phenoxyacetic acid, mutants designated as strain PAA, capable of utilizing phenoxyacetic acid as well as phenol, emerged spontaneously at a frequency of 1 x 10(-8). A deletion mutant strain PT88, which is devoid of a part of 2,4,5-T metabolic pathway, generated neither phenoxyacetic acid utilizing nor phenol-utilizing mutants. The wild type (Wt) strain AC1100 and all its mutants utilized benzoate via ortho-cleavage pathway. However, only mutant strain PAA harbored the whole set of enzymes required for utilization of phenol via meta-cleavage pathway. The results suggest that Wt strain AC1100 carries silent genes for meta-cleavage pathway which are expressed in strain PAA enabling it to utilize phenoxyacetic acid and phenol. Gene activation is presumed to be due to the translocation of insertion elements.
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