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Related Experiment Videos

Assimilatory nitrate reductase from Acinetobacter calcoaceticus

A Villalobo, J M Roldán, J Rivas

    Archives of Microbiology
    |March 1, 1977
    PubMed
    Summary

    Researchers characterized a soluble nitrate reductase in Acinetobacter calcoaceticus. This enzyme

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    Journal of materials chemistry. B·2020

    Area of Science:

    • Microbiology
    • Enzymology
    • Biochemistry

    Background:

    • Nitrate reductase is crucial for microbial nitrogen metabolism.
    • Acinetobacter calcoaceticus utilizes nitrate as a nitrogen source.
    • Understanding nitrate reductase regulation is key to microbial physiology.

    Purpose of the Study:

    • To characterize the soluble nitrate reductase from Acinetobacter calcoaceticus.
    • To elucidate the enzyme's molecular properties and cofactor requirements.
    • To investigate the regulatory mechanisms governing nitrate reductase activity.

    Main Methods:

    • Enzyme purification and molecular weight determination.
    • Enzyme activity assays using various electron donors (viologen dyes, NAD(P)H).
    • Investigating cofactor dependency (molybdenum) and inhibition (tungstate, KCN, -SH reagents).

    Main Results:

    • A 96,000 molecular weight soluble nitrate reductase was identified.
    • The enzyme requires molybdenum and is inhibited by KCN and -SH reagents.
    • Enzyme synthesis is repressed by ammonia, and activity is regulated by an interconversion mechanism involving cyanate.

    Conclusions:

    • Acinetobacter calcoaceticus possesses a molybdenum-dependent nitrate reductase.
    • Ammonia represses enzyme synthesis, and cyanate plays a role in activity regulation.
    • The study suggests a potential interconversion mechanism in nitrate reductase regulation.

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