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Related Experiment Videos

Oxygen exchange between nitrate molecules during nitrite oxidation by Nitrobacter.

A A DiSpirito, A B Hooper

    The Journal of Biological Chemistry
    |August 15, 1986
    PubMed
    Summary
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    Nitrobacter winogradskyi actively exchanges oxygen atoms during nitrite oxidation, with water serving as the oxygen source for nitrate production. This suggests a novel oxidoreductase enzyme involved in the process.

    Area of Science:

    • Microbial metabolism
    • Biogeochemical cycles
    • Enzyme catalysis

    Background:

    • Nitrite oxidation is a key step in nitrification, influencing nitrogen cycling in ecosystems.
    • Nitrobacter winogradskyi is a well-studied bacterium involved in this process.
    • Understanding oxygen transfer mechanisms is crucial for microbial ecology.

    Purpose of the Study:

    • To investigate the oxygen atom exchange between nitrate and water during nitrite oxidation by Nitrobacter winogradskyi.
    • To determine the source of oxygen incorporated into nitrate during this process.
    • To explore the enzymatic basis for nitrate-nitrate oxygen exchange.

    Main Methods:

    • Incubation of Nitrobacter winogradskyi with isotopically labeled substrates (15N and 18O).

    Related Experiment Videos

  • Analysis of 15N-nitrate using 15N NMR with 18O-isotope shifts.
  • Quantification of oxygen exchange between nitrate and water.

    • Main Results:

    • Active exchange of oxygen atoms between exogenous nitrate and nitrite was observed.
    • Water was identified as the primary source of oxygen incorporated into nitrate during nitrite oxidation.
    • Limited oxygen exchange occurred between nitrate and water directly.
    • The specific enzymes (nitrite oxidase or nitrate reductase) catalyzing the nitrate-nitrate oxygen exchange remain undetermined.

    Conclusions:

    • Nitrite oxidation by Nitrobacter winogradskyi involves significant oxygen atom exchange, with water as the oxygen source for nitrate.
    • The findings suggest the presence of a water-utilizing oxidoreductase involved in nitrate metabolism.
    • Further research is needed to elucidate the precise enzymatic mechanisms and the roles of nitrite oxidase and nitrate reductase in this oxygen exchange process.