Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Biodegradation of Di-n-Butyl Phthalate by Rhodococcus sp. JDC-11 and Molecular Detection of 3,4-Phthalate Dioxygenase Gene

  • Jin, De-Cai (Department of Bioengineering, School of Minerals Processing and Bioengineering, Central South University) ;
  • Liang, Ren-Xing (Department of Bioengineering, School of Minerals Processing and Bioengineering, Central South University) ;
  • Dai, Qin-Yun (Department of Bioengineering, School of Minerals Processing and Bioengineering, Central South University) ;
  • Zhang, Rui-Yong (Department of Bioengineering, School of Minerals Processing and Bioengineering, Central South University) ;
  • Wu, Xue-Ling (Department of Bioengineering, School of Minerals Processing and Bioengineering, Central South University) ;
  • Chao, Wei-Liang (Department of Bioengineering, School of Minerals Processing and Bioengineering, Central South University)
  • Received : 2010.04.22
  • Accepted : 2010.07.06
  • Published : 2010.10.28
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Abstract

Rhodococcus sp. JDC-11, capable of utilizing di-n-butyl phthalate (DBP) as the sole source of carbon and energy, was isolated from sewage sludge and confirmed mainly based on 16S rRNA gene sequence analysis. The optimum pH, temperature, and agitation rate for DBP degradation by Rhodococcus sp. JDC-11 were 8.0, $30^{\circ}C$, and 175 rpm, respectively. In addition, low concentrations of glucose were found to inhibit the degradation of DBP, whereas high concentrations of glucose increased its degradation. Meanwhile, a substrate utilization test showed that JDC-11 was also able to utilize other phthalates. The major metabolites of DBP degradation were identified as monobutyl phthalate and phthalic acid by gas chromatography-mass spectrometry, allowing speculation on the tentative metabolic pathway of DBP degradation by Rhodococcus sp. JDC-11. Using a set of new degenerate primers, a partial sequence of the 3,4-phthalate dioxygenase gene was obtained from JDC-11. Moreover, a sequence analysis revealed that the phthalate dioxygenase gene of JDC-11 was highly homologous to the large subunit of the phthalate dioxygenase from Rhodococcus coprophilus strain G9.

Keywords

References

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