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Related Experiment Videos

Homologous Plasmids from Soil Bacteria Encoding D,L-Halidohydrolases

Brokamp1, Schwarze, Schmidt

  • 1Department of Microbiology, FB19, University Gesamthochschule Kassel, Heinrich-Plett-Str. 40, D-34109 Kassel, Germany

Current Microbiology
|February 1, 1997
PubMed
Summary

Soil bacteria were found to possess D,L-halidohydrolases, enzymes crucial for dehalogenation. Three bacterial plasmids (pFL160, pFL170, pFL190) were identified as encoding these dehalogenase enzymes, showing high homology to known genes.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biochemistry

Background:

  • Halidohydrolases are enzymes capable of dehalogenating compounds.
  • Soil bacteria are a rich source of diverse microbial enzymes.
  • Understanding dehalogenase genes is important for bioremediation.

Purpose of the Study:

  • To isolate and characterize D,L-halidohydrolases from soil bacteria.
  • To identify the genetic basis for dehalogenase activity in selected bacterial strains.
  • To compare newly identified halidohydrolases with known enzymes.

Main Methods:

  • Isolation and biochemical characterization of D,L-halidohydrolases from five soil bacteria.
  • Plasmid curing and mating experiments to identify plasmid-encoded dehalogenases.

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  • Restriction enzyme analysis and DNA hybridization to assess gene homology.

    • Main Results:

    • D,L-halidohydrolases were successfully isolated and characterized from five soil bacterial strains.
    • Three bacterial strains harbored plasmids (pFL160, pFL170, pFL190) encoding dehalogenase activity.
    • Biochemical and genetic analyses revealed close relationships among these halidohydrolases and their genes, including homology to the DhlIV enzyme.

    Conclusions:

    • Soil bacteria harbor diverse D,L-halidohydrolases, with plasmid-borne genes being a significant source.
    • The identified dehalogenase genes exhibit high homology, suggesting conserved mechanisms for dehalogenation.
    • These findings contribute to the understanding of microbial dehalogenation pathways and potential applications in environmental cleanup.