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TNT biotransformation: when chemistry confronts mineralization.

Barth F Smets1, Hong Yin, Abraham Esteve-Nuñez

  • 1Institute of Environment and Resources, Technical University of Denmark, Bygningstorvet, Bldg 115, 2800 Kgs. Lyngby, Denmark. bfs@er.dtu.dk

Applied Microbiology and Biotechnology
|May 31, 2007
PubMed
Summary

Microbial biotransformation of 2,4,6-trinitrotoluene (TNT) has advanced, with new enzymes identified for nitroreduction and denitration. Biotreatment technologies now effectively immobilize TNT through microbial and plant-assisted remediation.

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Area of Science:

  • Environmental microbiology
  • Biochemistry
  • Bioremediation technologies

Background:

  • Significant advancements in understanding microbial 2,4,6-trinitrotoluene (TNT) biotransformation genetics and biochemistry over the last decade.
  • Development of effective biotreatment technologies for TNT-contaminated sites.

Purpose of the Study:

  • To review recent progress in microbial TNT biotransformation.
  • To summarize newly identified enzyme classes and metabolic pathways involved in TNT degradation.
  • To discuss the implications for bioremediation strategies.

Main Methods:

  • Literature review of recent studies on microbial TNT biotransformation.
  • Analysis of identified enzyme classes (nitroreductases, old yellow enzyme family, etc.).
  • Examination of dual metabolic pathways: nitroreduction and denitration.

Main Results:

  • Identified key enzyme classes involved in TNT biotransformation, including nitroreductases and dioxygenases.
  • Described dual pathways: nitroreduction (to hydroxylamino/amino) and denitration (ring reduction with nitrite release).
  • Confirmed TNT can serve as a nitrogen source via ammonia release from intermediates.
  • Field studies show microbial nitroreduction and phytoremediation permanently immobilize TNT metabolites.

Conclusions:

  • New insights into TNT biotransformation pathways and enzymes have emerged.
  • Biotreatment strategies, including stimulated nitroreduction and phytoremediation, are effective for TNT immobilization.
  • Further research is needed to fully characterize enzymes and mechanisms for potential TNT mineralization.