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Applied and Environmental Microbiology, September 1998, p. 3270-3274, Vol. 64, No. 9
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Initial Transformations in the Biodegradation of Benzothiazoles by Rhodococcus Isolates

Helene De Wever,1,2,* Karen Vereecken,1 Andreas Stolz,2 and Hubert Verachtert1

Laboratory for Industrial Microbiology and Biochemistry, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium,1 and Institut für Mikrobiologie, Universität Stuttgart, 70569 Stuttgart, Germany2

Received 21 April 1998/Accepted 30 June 1998

Benzothiazole-2-sulfonate (BTSO3) is one of the side products occurring in 2-mercaptobenzothiazole (MBT) production wastewater. We are the first to isolate an axenic culture capable of BTSO3 degradation. The isolate was identified as a Rhodococcus erythropolis strain and also degraded 2-hydroxybenzothiazole (OBT) and benzothiazole (BT), but not MBT, which was found to inhibit the biodegradation of OBT, BT, and BTSO3. In anaerobic resting cell assays, BTSO3 was transformed into OBT in stoichiometric amounts. Under aerobic conditions, OBT was observed as an intermediate in BT breakdown and an unknown compound transiently accumulated in several assays. This product was identified as a dihydroxybenzothiazole. Benzothiazole degradation pathways seem to converge into OBT, which is then transformed further into the dihydroxy derivative.

* Corresponding author. Present address: Laboratory for Soil Fertility and Soil Biology, Katholieke Universiteit Leuven, Kardinaal Mercierlaan 92, 3001 Heverlee, Belgium. Phone: 32-16-329676. Fax: 32-16-321997. E-mail: heleen.dewever{at}agr.kuleuven.ac.be.

Applied and Environmental Microbiology, September 1998, p. 3270-3274, Vol. 64, No. 9
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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