Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Catabolic Degradation of 4-Chlorobiphenyl by Pseudomonas sp. DJ-12 via Consecutive Reaction of meta-Cleavage and Hydrolytic Dechlorination

  • Chae, Jong-Chan (Laboratory of Environmental and Molecular Microbiology, Chungbuk National University) ;
  • Kim, Eunheui (Department of Fish Pathology, Yosu National University) ;
  • Park, Sang-Ho (Laboratory of Environmental and Molecular Microbiology, Chungbuk National University) ;
  • Kim, Chi-Kyung (Laboratory of Environmental and Molecular Microbiology, Chungbuk National University)
  • Published : 2000.11.01
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Abstract

Pseudomonas sp. strain DJ-12 is a bacterial isolate capable of degrading 4-chlorobiphenyl (4CBP) as a carbon and energy source. The catabolic degradation of 4CBP by the strain DJ-12 was studied along with the genetic organization of the genes responsible for the crucial steps of the catabolic degradation. The catabolic pathway was characterized as being conducted by consecutive reactions of the meta-cleavage of 4CBP, hydrolytic dechlorination of 4-chlorobenzoate (4CBA), hydroxylation of 4-hydroxybenzoate, and meta-cleavage of protocatechuate. The pcbC gene responsible for the meta-cleavage of 4CBP only showed a 30 to 40% homology in its deduced amino acid sequence compared to those of the corresponding genes from other strains. The amino acid sequence of 4CBA-CoA dechlorinase showed an 86% homology with that of Pseudomonas sp. CBS3, yet only a 50% homology with that of Arthrobacter spp. However, the fcb genes for the hydrolytic dechlorination of 4CBA in Pseudomonas sp. DJ-12 showed an uniquely different organization from those of CBS3 and other reported strains. Accordingly, these results indicate that strain DJ-12 can degrade 4CBA completely via meta-cleavage and hydrolytic dechlorination using enzymes that are uniquely different in their amino acid sequences from those of other bacterial strains with the same degradation activities.

Keywords

References

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