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Appl Environ Microbiol. 1988 June; 54(6): 1498-1503

Toluene degradation by Pseudomonas putida F1: genetic organization of the tod operon.

Center for Applied Microbiology, University of Texas, Austin 78712.

ABSTRACT

Pseudomonas putida PpF1 degrades toluene through cis-toluene dihydrodiol to 3-methylcatechol. The latter compound is metabolized through the well-established meta pathway for catechol degradation. The first four steps in the pathway involve the sequential action of toluene dioxygenase (todABC1C2), cis-toluene dihydrodiol dehydrogenase (todD), 3-methylcatechol 2,3-dioxygenase (todE), and 2-hydroxy-6-oxo-2,4-heptadienoate hydrolase (todF). The genes for these enzymes form part of the tod operon which is responsible for the degradation of toluene by this organism. A combination of transposon mutagenesis of the PpF1 chromosome, as well as analysis of cloned chromosomal fragments, was used to determine the physical order of the genes in the tod operon. The genes were determined to be transcribed in the order todF, todC1, todC2, todB, todA, todD, todE.

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