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. 1990 May;172(5):2351–2359. doi: 10.1128/jb.172.5.2351-2359.1990

Organization and sequence analysis of the 2,4-dichlorophenol hydroxylase and dichlorocatechol oxidative operons of plasmid pJP4.

E J Perkins 1, M P Gordon 1, O Caceres 1, P F Lurquin 1
PMCID: PMC208869  PMID: 2185214

Abstract

Growth of Alcaligenes eutrophus JMP134 on 2,4-dichlorophenoxyacetate requires a 2,4-dichlorphenol hydroxylase encoded by gene tfdB. Catabolism of either 2,4-dichlorophenoxyacetate or 3-chlorobenzoate involves enzymes encoded by the chlorocatechol oxidative operon consisting of tfdCDEF, which converts 3-chloro- and 3,5-dichlorocatechol to maleylacetate and chloromaleylacetate, respectively. Transposon mutagenesis has localized tfdB and tfdCDEF to EcoRI fragment B of plasmid pJP4 (R. H. Don, A. J. Wieghtman, H.-J. Knackmuss, and K. N. Timmis, J. Bacteriol. 161:85-90, 1985). We present the complete nucleotide sequence of tfdB and tfdCDEF contained within a 7,954-base-pair HindIII-SstI fragment from EcoRI fragment B. Sequence and expression analysis of tfdB in Escherichia coli suggested that 2,4-dichlorophenol hydroxylase consists of a single subunit of 65 kilodaltons. The amino acid sequences of proteins encoded by tfdD and tfdE were found to be 63 and 53% identical to those of functionally similar enzymes encoded by clcB and clcD, respectively, from plasmid pAC27 of Pseudomonas putida. P. putida(pAC27) can utilize 3-chlorocatechol but not dichlorinated catechols. A region of DNA adjacent to clcD in pAC27 was found to be 47% identical in amino acid sequence to tfdF, a gene important in catabolizing dichlorocatechols. The region in pAC27 does not appear to encode a protein, suggesting that the absence of a functional trans-chlorodienelactone isomerase may prevent P. putida(pAC27) from utilizing 3,5-dichlorocatechol.

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Selected References

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