Biodegradation of the organochlorine insecticide, endosulfan, and the toxic metabolite, endosulfan sulfate, by Klebsiella oxytoca KE-8
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- Biodegradation of the organochlorine insecticide, endosulfan, and the toxic metabolite, endosulfan sulfate, by Klebsiella oxytoca KE-8
- G S Kwon; H Y Sohn; Kee Sun Shin; E Kim; B I Seo
- Bibliographic Citation
- Applied Microbiology and Biotechnology, vol. 67, no. 6, pp. 845-850
- Publication Year
- Biodegradation of endosulfan, a chlorinated cyclodiene insecticide, is generally accompanied by production of the more toxic and more persistent metabolite, endosulfan sulfate. Since our reported endosulfan degrader, Klebsiella pneumoniae KE-1, failed to degrade endosulfan sulfate, we tried to isolate an endosulfan sulfate degrader from endosulfan-polluted soils. Through repetitive enrichment and successive subculture using mineral salt medium containing endosulfan or endosulfan sulfate as the sole source of carbon and energy, we isolated a bacterium capable of degrading endosulfan sulfate as well as endosulfan. The bacterium KE-8 was identified as Klebsiella oxytoca from the results of 16S rDNA sequence analysis. In biodegradation assays with KE-8 using mineral salt medium containing endosulfan (150 mg l-1) or endosulfan sulfate (173 mg l-1), the biomass was rapidly increased to an optical density at 550 nm of 1.9 in 4 days and the degradation constants for α- and β-endosulfan, and endosulfan sulfate were 0.3084, 0.2983 and 0.2465 day-1, respectively. Analysis of the metabolites further suggested that K. oxytoca KE-8 has high potential as a biocatalyst for bioremediation of endosulfan and/or endosulfan sulfate.
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- Division of Biomedical Research > Microbiome Convergence Research Center > 1. Journal Articles
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