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Initial transformations in the biodegradation of benzothiazoles by Rhodococcus isolates
H De Wever1, K Vereecken, A Stolz
1Laboratory for Industrial Microbiology and Biochemistry, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium. heleen.dewever@agr.kuleuven.ac.be
Applied and Environmental Microbiology
|September 3, 1998
Summary
A novel Rhodococcus erythropolis strain degrades benzothiazole-2-sulfonate (BTSO3) and related compounds. This discovery offers a new biological approach for treating industrial wastewater containing these persistent organic pollutants.
Area of Science:
- Environmental microbiology
- Bioremediation of industrial pollutants
- Benzothiazole chemistry
Background:
- Wastewater from 2-mercaptobenzothiazole (MBT) production contains benzothiazole-2-sulfonate (BTSO3) as a byproduct.
- Effective bioremediation strategies for BTSO3 and related benzothiazoles are limited.
Purpose of the Study:
- To isolate and identify microorganisms capable of degrading BTSO3.
- To elucidate the degradation pathways of benzothiazoles by the isolated strain.
- To investigate the effect of MBT on the biodegradation of BTSO3, 2-hydroxybenzothiazole (OBT), and benzothiazole (BT).
Main Methods:
- Isolation of an axenic microbial culture from MBT production wastewater.
- Identification of the isolate using 16S rRNA gene sequencing.
- Degradation assays under anaerobic and aerobic conditions.
- Identification of degradation intermediates using analytical techniques.
Main Results:
- An axenic culture of Rhodococcus erythropolis was isolated, capable of degrading BTSO3, OBT, and BT.
- MBT was found to inhibit the biodegradation of OBT, BT, and BTSO3.
- Anaerobic transformation of BTSO3 yielded OBT stoichiometrically.
- Aerobic degradation revealed OBT as an intermediate in BT breakdown, leading to a dihydroxybenzothiazole derivative.
Conclusions:
- Rhodococcus erythropolis is a promising candidate for the bioremediation of BTSO3 and related benzothiazoles.
- Benzothiazole degradation pathways converge at OBT, which is further metabolized to a dihydroxy derivative.
- MBT exhibits inhibitory effects on the biodegradation of key benzothiazole compounds, necessitating further investigation for effective treatment strategies.