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Related Experiment Videos

[Thiosulfate oxidation by nonsulfur purple bacteria].

O I Keppen, L V Pedan, N A Rodova

    Mikrobiologiia
    |September 1, 1980
    PubMed
    Summary

    Purple bacteria can oxidize thiosulfate, a sulfur compound. Some species also fix carbon dioxide during this process under anaerobic, light conditions, indicating diverse metabolic capabilities.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Environmental Science

    Background:

    • Thiosulfate oxidation is a key microbial process in sulfur cycling.
    • Purple bacteria are known for diverse metabolic pathways, including phototrophy and chemoautotrophy.

    Purpose of the Study:

    • To investigate the thiosulfate oxidizing capabilities of various purple bacteria species.
    • To determine the conditions (aerobic/anaerobic, light/dark) under which thiosulfate oxidation occurs.
    • To explore the link between thiosulfate oxidation and carbon dioxide fixation in these bacteria.

    Main Methods:

    • Culturing of 11 purple bacteria strains: Rhodomicrobium vannielii, Rhodopseudomonas viridis, R. sphaeroides, R. capsulata, and Rhodospirillum rubrum.
    • Assessing thiosulfate oxidation under aerobic and anaerobic conditions, with and without light.
    • Measuring carbon dioxide fixation coupled with thiosulfate oxidation.
    • Enzyme assays for thiosulfate reductase, thiosulfate oxidase, and sulfite oxidase activities.

    Main Results:

    • All studied purple bacteria oxidized thiosulfate aerobically in the dark.
    • Specific strains of Rhodopseudomonas sphaeroides (2R, 8259, A1, A2, D1) oxidized thiosulfate anaerobically in the light.
    • This anaerobic, light-driven thiosulfate oxidation was coupled with carbon dioxide fixation.
    • All strains possessed thiosulfate reductase activity; most also had thiosulfate oxidase and sulfite oxidase activity.

    Conclusions:

    • Purple bacteria exhibit diverse thiosulfate oxidation capabilities.
    • Rhodopseudomonas sphaeroides strains demonstrate anaerobic, photo-coupled thiosulfate oxidation and carbon fixation.
    • The presence of key enzymes suggests the biochemical pathways involved in thiosulfate metabolism.

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