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J Bacteriol, July 1998, p. 3503-3508, Vol. 180, No. 14
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Characterization of the Maleylacetate Reductase MacA of Rhodococcus opacus 1CP and Evidence for the Presence of an Isofunctional Enzyme

Volker Seibert,1,dagger Elena M. Kourbatova,2,Dagger Ludmila A. Golovleva,2 and Michael Schlömann1,*

Institut für Mikrobiologie, Universität Stuttgart, D-70569 Stuttgart, Germany,1 and Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Russia2

Received 27 October 1997/Accepted 8 May 1998

Maleylacetate reductases (EC 1.3.1.32) have been shown to contribute not only to the bacterial catabolism of some usual aromatic compounds like quinol or resorcinol but also to the degradation of aromatic compounds carrying unusual substituents, such as halogen atoms or nitro groups. Genes coding for maleylacetate reductases so far have been analyzed mainly in chloroaromatic compound-utilizing proteobacteria, in which they were found to belong to specialized gene clusters for the turnover of chlorocatechols or 5-chlorohydroxyquinol. We have now cloned the gene macA, which codes for one of apparently (at least) two maleylacetate reductases in the gram-positive, chlorophenol-degrading strain Rhodococcus opacus 1CP. Sequencing of macA showed the gene product to be relatively distantly related to its proteobacterial counterparts (ca. 42 to 44% identical positions). Nevertheless, like the known enzymes from proteobacteria, the cloned Rhodococcus maleylacetate reductase was able to convert 2-chloromaleylacetate, an intermediate in the degradation of dichloroaromatic compounds, relatively fast and with reductive dehalogenation to maleylacetate. Among the genes ca. 3 kb up- and downstream of macA, none was found to code for an intradiol dioxygenase, a cycloisomerase, or a dienelactone hydrolase. Instead, the only gene which is likely to be cotranscribed with macA encodes a protein of the short-chain dehydrogenase/reductase family. Thus, the R. opacus maleylacetate reductase gene macA clearly is not part of a specialized chlorocatechol gene cluster.

* 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: Genzentrum, Universität München, Munich, Germany.

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

J Bacteriol, July 1998, p. 3503-3508, Vol. 180, No. 14
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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