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J Bacteriol, March 1998, p. 1082-1094, Vol. 180, No. 5
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Evolutionary Relationship between Chlorocatechol Catabolic Enzymes from Rhodococcus opacus 1CP and Their Counterparts in Proteobacteria: Sequence Divergence and Functional Convergence

Dirk Eulberg,1 Elena M. Kourbatova,2,dagger Ludmila A. Golovleva,2 and Michael Schlömann1,*

Institut für Mikrobiologie, Universität Stuttgart, D-70550 Stuttgart, Germany,1 and Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Russia2

Received 8 September 1997/Accepted 12 December 1997

Biochemical investigations of the muconate and chloromuconate cycloisomerases from the chlorophenol-utilizing strain Rhodococcus opacus (erythropolis) 1CP had previously indicated that the chlorocatechol catabolic pathway of this strain may have developed independently from the corresponding pathways of proteobacteria. To test this hypothesis, we cloned the chlorocatechol catabolic gene cluster of strain 1CP by using PCR with primers derived from sequences of N termini and peptides of purified chlorocatechol 1,2-dioxygenase and chloromuconate cycloisomerase. Sequencing of the clones revealed that they comprise different parts of the same gene cluster in which five open reading frames have been identified. The clcB gene for chloromuconate cycloisomerase is transcribed divergently from a gene which codes for a LysR-type regulatory protein, the presumed ClcR. Downstream of clcR but separated from it by 222 bp, we detected the clcA and clcD genes, which could unambiguously be assigned to chlorocatechol 1,2-dioxygenase and dienelactone hydrolase. A gene coding for a maleylacetate reductase could not be detected. Instead, the product encoded by the fifth open reading frame turned out to be homologous to transposition-related proteins of IS1031 and Tn4811. Sequence comparisons of ClcA and ClcB to other 1,2-dioxygenases and cycloisomerases, respectively, clearly showed that the chlorocatechol catabolic enzymes of R. opacus 1CP represent different branches in the dendrograms than their proteobacterial counterparts. Thus, while the sequences diverged, the functional adaptation to efficient chlorocatechol metabolization occurred independently in proteobacteria and gram-positive bacteria, that is, by functionally convergent evolution.

* Corresponding author. Mailing address: Institut für Mikrobiologie, Universität Stuttgart, Allmandring 31, D-70569 Stuttgart, Germany. Phone: (49)-711-6855489. Fax: (49)-711-6855725. E-mail: imbms{at}po.uni-stuttgart.de.

dagger Present address: Pushchino State University, Genetic Engineering Plant Biotechnology Department, Pushchino, Russia.




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