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Related Experiment Videos

Spiroplasma fibrils.

R Townsend

    The Yale Journal of Biology and Medicine
    |September 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Spiroplasma fibrils, composed of a unique 55,000 MW protein, are conserved across species and may play a role in maintaining helical shape and DNA segregation during cell division.

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    Area of Science:

    • Microbiology
    • Cell Biology
    • Molecular Biology

    Background:

    • Spiroplasmas are wall-less prokaryotes with unique helical morphology.
    • The presence of actin-like proteins in some prokaryotes suggests cytoskeletal similarities with eukaryotes.
    • The function of Spiroplasma fibrils and their relationship to cell shape and motility remain unclear.

    Purpose of the Study:

    • To characterize the protein composing Spiroplasma fibrils.
    • To investigate the distribution and potential function of these fibrils within Spiroplasma cells.
    • To explore the role of fibrils in maintaining helical morphology and cell division.

    Main Methods:

    • Protein analysis to determine molecular weight and specificity.
    • Comparative analysis with other prokaryotes and eukaryotic cytoskeletal components.

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  • Microscopic observation of fibril arrangement in Spiroplasma citri strains.
  • Correlation of fibril presence with cell morphology and DNA filaments.

    • Main Results:

    • Spiroplasmas possess unique, highly conserved fibrils made of a 55,000 MW protein.
    • This protein is specific to Spiroplasma and unrelated to eukaryotic cytoskeletal proteins.
    • Fibrils are present in similar concentrations in both helical and nonhelical Spiroplasma citri strains.
    • Evidence suggests fibrils are bundled and associated with DNA filaments in intact cells.

    Conclusions:

    • Spiroplasma fibrils are distinct from known prokaryotic and eukaryotic cytoskeletal elements.
    • The findings challenge previous hypotheses regarding the direct role of fibrils in maintaining helical shape and rotary motility.
    • Fibrils may be involved in chromosome segregation during cell division and maintaining helical morphology through alternative mechanisms.