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Related Experiment Videos

Denitrification by Alcaligenes eutrophus is plasmid dependent.

D Römermann, B Friedrich

    Journal of Bacteriology
    |May 1, 1985
    PubMed
    Summary

    Curing the pHG megaplasmid in Alcaligenes eutrophus bacteria resulted in a loss of the ability to denitrify. Retransferring the plasmid restored this denitrifying ability, highlighting its importance for anaerobic nitrite metabolism.

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    Area of Science:

    • Microbiology
    • Bacterial Genetics
    • Environmental Microbiology

    Background:

    • Alcaligenes eutrophus is a facultative lithoautotrophic bacterium.
    • Denitrification is a crucial microbial process in nitrogen cycling.
    • Megaplasmids can carry genes essential for bacterial phenotypes.

    Purpose of the Study:

    • To investigate the role of the hydrogenase-specifying megaplasmid pHG in the denitrifying ability of Alcaligenes eutrophus.
    • To understand the genetic basis of anaerobic nitrite metabolism in this bacterium.

    Main Methods:

    • Plasmid curing experiments were performed on Alcaligenes eutrophus strains.
    • Phenotypic analysis of plasmid-free mutants and complemented strains.
    • Assessing nitrate and nitrite metabolism under anaerobic conditions.

    Main Results:

    • Curing of the pHG megaplasmid led to a loss of the denitrifying ability (Nitd).
    • Retransferring the pHG1 plasmid restored the Nitd phenotype.
    • Plasmid-free mutants could convert nitrate to nitrite but not metabolize nitrite anaerobically.

    Conclusions:

    • The megaplasmid pHG is essential for the complete denitrification process in Alcaligenes eutrophus.
    • pHG likely carries genes critical for anaerobic nitrite metabolism.
    • This finding elucidates the genetic control of denitrification in this important bacterium.

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