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Magnetosome dynamics in magnetotactic bacteria.

S Ofer, I Nowik, E R Bauminger

    Biophysical Journal
    |July 1, 1984
    PubMed
    Summary
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    Magnetotactic bacteria Aquaspirillum magnetotacticum exhibit diffusive magnetosome motion, analyzed via Mössbauer spectroscopy. Results indicate particle fixation within cells, with viscosity dependent on temperature.

    Area of Science:

    • Biophysics
    • Microbiology
    • Materials Science

    Background:

    • Magnetotactic bacteria possess intracellular magnetic crystals called magnetosomes.
    • Diffusive motion of these magnetosomes influences cellular properties and can be studied using Mössbauer spectroscopy.

    Purpose of the Study:

    • To analyze the diffusive motion of magnetosomes in Aquaspirillum magnetotacticum.
    • To determine the rotational and translational dynamics of magnetosomes.
    • To investigate the effective viscosity of the magnetosome-associated environment.

    Main Methods:

    • Mössbauer spectroscopy was employed to analyze magnetosome dynamics.
    • A bounded diffusion model was utilized for data analysis.
    • Temperature-dependent measurements were performed.

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    Main Results:

    • A very broad-line Mössbauer spectrum was observed, increasing in width with temperature.
    • Rotational and translational motions were quantified, suggesting particle fixation within cells.
    • Effective viscosity was determined to be 10 cP at 295 K, increasing as temperature decreased.

    Conclusions:

    • Magnetosome movement in Aquaspirillum magnetotacticum is highly restricted, implying they are fixed within the cell.
    • The surrounding cellular material exhibits temperature-dependent viscosity.
    • Iron speciation differs, with Fe3+ associated with magnetosomes and Fe2+ with the cell envelope.