Summary
Toluate 1,2-dioxygenase is the first enzyme of a meta-cleavage pathway for the oxidative catabolism of benzoate and substituted benzoates to Krebs cycle intermediates that is specified by TOL plasmid pWW0 of Pseudomonas putida. A collection of derivatives harbouring Tn1000 insertions and defective in toluate dioxygenase have been isolated from pPL392, a pBR322-based hybrid plasmid carrying the TOL plasmid meta-cleavage pathway operon. In parallel, a series of N-methyl-N′-nitro-N-nitrosoguanidine-induced mutant plasmids defective in this enzyme activity were isolated from pNM72, a pKT231-based hybrid plasmid carrying the same operon. Pairs of mutant plasmids, consisting of one Tn1000 derivative and one nitrosoguanidine-induced derivative, were used for complementation analysis of toluate dioxygenase in Escherichia coli recA bacteria, in which the formation of 2-hydroxymuconic semialdehyde from benzoate was examined. Four cistrons for toluate 1,2-dioxygenase were thus identified. DNA fragments containing nitrosoguanidine-induced mutant cistrons plus the other meta-cleavage operon genes were cloned into pOT5, an R388-based vector, and complementation tests between different nitrosoguanidine-induced mutant cistrons were carried out in Pseudomonas putida cells, this time scoring for growth on p-toluate. This analysis also identified four cistrons. Examination of the products of these cistrons, by means of E. coli minicells containing pPL392 or its Tn1000 insertion derivatives, indicated that the first two cistrons of the operon comprise a single gene, xylX, which encodes a 57 kilodalton protein, and that the third cistron, xy/Y, encodes a 20 kilodalton protein.
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Harayama, S., Rekik, M. & Timmis, K.N. Genetic analysis of a relaxed substrate specificity aromatic ring dioxygenase, toluate 1,2-dioxygenase, encoded by TOL plasmid pWW0 of Pseudomonas putida . Mol Gen Genet 202, 226–234 (1986). https://doi.org/10.1007/BF00331641
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DOI: https://doi.org/10.1007/BF00331641