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Treadmilling, diffusional exchange and cytoplasmic structures.

A B Fulton

    Journal of Muscle Research and Cell Motility
    |June 1, 1985
    PubMed
    Summary
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    Cytoplasmic structures like microfilaments and microtubules exchange monomers via treadmilling and diffusional exchange. Diffusional exchange appears dominant for steady-state structures, with potential for other cellular mechanisms.

    Area of Science:

    • Cell biology
    • Biophysics
    • Cytoskeletal dynamics

    Background:

    • Microfilaments and microtubules are essential cytoskeletal polymers.
    • These polymers dynamically exchange monomers with the surrounding cellular environment.
    • Understanding these exchange mechanisms is crucial for cell structure and function.

    Purpose of the Study:

    • To analyze the kinetics of monomer exchange in microfilaments and microtubules.
    • To differentiate the predictions of treadmilling and diffusional exchange mechanisms.
    • To investigate the predominant exchange mechanism in vivo for steady-state structures.

    Main Methods:

    • Refined kinetic analysis of microfilament and microtubule assembly.
    • Comparison of theoretical predictions from treadmilling and diffusional exchange models.

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  • In vivo studies of cytoplasmic structure assembly.

    • Main Results:

    • Monomer exchange can be nonlinear under specific conditions.
    • Treadmilling and diffusional exchange exhibit distinct predictions for cytoskeletal behavior.
    • Diffusional exchange appears to be the predominant mechanism for steady-state structures in vivo.

    Conclusions:

    • Diffusional exchange is likely the primary mechanism for maintaining steady-state cytoskeletal structures.
    • Additional, yet unidentified, mechanisms may also contribute to cytoskeletal dynamics within the cell.