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Appl Environ Microbiol. 1985 December; 50(6): 1409-1413

Use of cloned genes of Pseudomonas TOL plasmid to effect biotransformation of benzoates to cis-dihydrodiols and catechols by Escherichia coli cells.

ABSTRACT

DNA fragments containing the xylD and xylL genes, which specify the broad-specificity enzymes toluate-1,2-dioxygenase and 3,5-cyclohexadiene-1,2-diol-1-carboxylic acid dehydrogenase, respectively, of TOL plasmid pWW0-161 of Pseudomonas putida have previously been cloned in the pBR322 vector plasmid (P.R. Lehrbach, J. Zeyer, W. Reinecke, H.-J. Knackmuss, and K. N. Timmis, J. Bacteriol. 158:1025-1032, 1984). In this study, Escherichia coli cells containing hybrid plasmids carrying the cloned xylD or xylDL genes quantitatively transformed 14C-ring- and 14C-carboxy-labeled benzoate to the pathway intermediates 3,5-cyclohexadiene-1,2-diol-1-carboxylic acid (cis-dihydrodiol) and catechol, respectively. Like P. putida cells, E. coli cells containing the xylD gene transformed a variety of chloro- and hydrocarbon-substituted benzoates. The toluate-1,2-dioxygenase produced in E. coli thus exhibited the broad-substrate-specificity properties of the enzyme in P. putida. Turnover rates by the enzymes in these two bacteria are compared.

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