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Localization of cell membrane components by surface diffusion into a "trap"

N M Chao, S H Young, M M Poo

    Biophysical Journal
    |October 1, 1981
    PubMed
    Summary
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    Cell membrane proteins can cluster due to cell contact. This study shows that lateral diffusion of these mobile membrane components toward a local "trap" explains their rapid localization, supporting a passive mechanism.

    Area of Science:

    • Cell biology
    • Biophysics
    • Membrane protein dynamics

    Background:

    • Cell membrane components can localize to specific surface regions through unknown mechanisms.
    • Cell-cell contact or extracellular ligands can induce this localization.

    Purpose of the Study:

    • Investigate the plausibility of a passive mechanism for membrane protein localization.
    • Determine if a local surface region acting as a 'trap' can explain observed localization.

    Main Methods:

    • Developed a mathematical model of a spherical cell with a surface trap.
    • Derived equations for surface density distribution and molecular lifetime.
    • Analyzed experimental data on soybean agglutinin receptor localization during cell-cell contact.

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    Main Results:

    • The surface-trap theory accurately predicted the localization rate of soybean agglutinin receptors.
    • Receptor diffusion coefficients before trapping were estimated at ~2.5 x 10^-9 cm²/s.
    • Independent measurements confirmed receptor lateral diffusion coefficients (~1.9 x 10^-9 cm²/s) consistent with the model.

    Conclusions:

    • Lateral diffusion of mobile membrane components toward a local trap is a plausible mechanism for localization.
    • This passive mechanism can account for localization induced by local surface modulation, such as cell-cell contact.