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Journal of Bacteriology, October 2002, p. 5282-5292, Vol. 184, No. 19
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.19.5282-5292.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

A New Modified ortho Cleavage Pathway of 3-Chlorocatechol Degradation by Rhodococcus opacus 1CP: Genetic and Biochemical Evidence

Olga V. Moiseeva,1,2 Inna P. Solyanikova,1,2 Stefan R. Kaschabek,1,{dagger} Janosch Gröning,1,{dagger} Monika Thiel,1,{dagger} Ludmila A. Golovleva,2 and Michael Schlömann1*

Institut für Mikrobiologie, University of Stuttgart, 70550 Stuttgart, Germany,1 Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Science, Pushchino, Russia2

Received 25 March 2002/ Accepted 27 June 2002

The 4-chloro- and 2,4-dichlorophenol-degrading strain Rhodococcus opacus 1CP has previously been shown to acquire, during prolonged adaptation, the ability to mineralize 2-chlorophenol. In addition, homogeneous chlorocatechol 1,2-dioxygenase from 2-chlorophenol-grown biomass has shown relatively high activity towards 3-chlorocatechol. Based on sequences of the N terminus and tryptic peptides of this enzyme, degenerate PCR primers were now designed and used for cloning of the respective gene from genomic DNA of strain 1CP. A 9.5-kb fragment containing nine open reading frames was obtained on pROP1. Besides other genes, a gene cluster consisting of four chlorocatechol catabolic genes was identified. As judged by sequence similarity and correspondence of predicted N termini with those of purified enzymes, the open reading frames correspond to genes for a second chlorocatechol 1,2-dioxygenase (ClcA2), a second chloromuconate cycloisomerase (ClcB2), a second dienelactone hydrolase (ClcD2), and a muconolactone isomerase-related enzyme (ClcF). All enzymes of this new cluster are only distantly related to the known chlorocatechol enzymes and appear to represent new evolutionary lines of these activities. UV overlay spectra as well as high-pressure liquid chromatography analyses confirmed that 2-chloro-cis,cis-muconate is transformed by ClcB2 to 5-chloromuconolactone, which during turnover by ClcF gives cis-dienelactone as the sole product. cis-Dienelactone was further hydrolyzed by ClcD2 to maleylacetate. ClcF, despite its sequence similarity to muconolactone isomerases, no longer showed muconolactone-isomerizing activity and thus represents an enzyme dedicated to its new function as a 5-chloromuconolactone dehalogenase. Thus, during 3-chlorocatechol degradation by R. opacus 1CP, dechlorination is catalyzed by a muconolactone isomerase-related enzyme rather than by a specialized chloromuconate cycloisomerase.

* Corresponding author. Present address: TU Bergakademie Freiberg, IÖZ, 09596 Freiberg, Germany. Phone: 49-3731-393739. Fax: 49-3731-393012. E-mail: schloemann{at}ioez.tu-freiberg.de.

{dagger} Present address: TU Bergakademie Freiberg, IÖZ, 09596 Freiberg, Germany.

Journal of Bacteriology, October 2002, p. 5282-5292, Vol. 184, No. 19
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.19.5282-5292.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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