Abstract
Three critical enzymes catechol oxygenase II (chlorocatechol dioxygenase), muconate cycloisomerase II, and dienelactone hydrolase, are involved in the degradation of chlorocatechols, which are obligatory intermediates in the catabolism of chlorinated aromatic compounds. The organization and complete nucleotide sequence of the genes for these enzymes have been determined on a 4.2-kilobase-pair (kbp) Bgl II fragment cloned from the plasmid pAC27, based on the agreement of open reading frame lengths with apparent mobilities of polypeptides expressed in Escherichia coli maxicells, predicted N-terminal amino acid sequences with those of the purified proteins, and predicted total amino acid compositions with those of the purified proteins. The 4.2-kbp fragment contains the three genes and ribosome binding sites for those genes but no promoter. When placed downstream of the tac promoter in the broad-host-range plasmid pMMB22, this fragment directs the synthesis of all three enzymes in both E. coli and Pseudomonas putida only on induction with isopropyl beta-D-thiogalactopyranoside, suggesting that the gene cluster is regulated as a single unit under the control of a single promoter. Endogenous transcription initiation of the gene cluster on pAC27, however, occurs from a site present within a 386-bp Bgl II fragment upstream of the 4.2-kbp fragment, and sequences 5' to that site are similar to the sequences of other positively controlled Pseudomonas promoters occurring on the TOL and NAH plasmids.
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