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Related Experiment Videos

Rotational diffusion of cell surface components by time-resolved phosphorescence anisotropy.

R H Austin, S S Chan, T M Jovin

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1979
    PubMed
    Summary

    Researchers measured cell membrane protein mobility using laser pulses. Band 3 protein showed temperature-dependent rotation, while lectin receptors on erythroleukemia cells were immobile.

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    Area of Science:

    • Biophysics
    • Cell Biology
    • Membrane Protein Dynamics

    Background:

    • Understanding the rotational diffusion of membrane proteins is crucial for elucidating cellular functions.
    • Concanavalin A receptors and band 3 anion transport system are key membrane components in erythroleukemia cells and erythrocytes, respectively.

    Purpose of the Study:

    • To measure the rotational diffusion of concanavalin A receptors and the band 3 anion transport system.
    • To investigate the temperature dependence of membrane protein rotational behavior.
    • To assess the applicability of time-resolved phosphorescence spectroscopy for studying living cell membrane dynamics.

    Main Methods:

    • Utilized time-dependent phosphorescence emission intensity and anisotropy of triplet probes.
    • Employed a 5-ns laser pulse for excitation.

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  • Achieved 10-microsecond time resolution with eosin probes at concentrations down to 20 nM in aqueous media (4-38°C).

    • Main Results:

    • A strong temperature dependence was observed in the rotational behavior of the band 3 anion transport protein.
    • Lectin receptors on Friend erythroleukemia cells exhibited immobility on the microsecond timescale (1-4000 µs) at both 4°C and 37°C.
    • The phosphorescence technique provided high-quality decay curves under physiological conditions.

    Conclusions:

    • The rotational dynamics of membrane proteins differ significantly between cell types and conditions.
    • Band 3 protein mobility is sensitive to temperature changes, suggesting dynamic interactions.
    • The employed phosphorescence technique is a viable method for studying membrane components in living cells without compromising viability.