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Related Experiment Videos

Membrane, action, and oscillatory potentials in simulated protocells

A T Przybylski, W P Stratten, R M Syren

    Die Naturwissenschaften
    |December 1, 1982
    PubMed
    Summary

    Proteinoid microspheres exhibit electrical potentials and action potentials, mimicking early cell behavior. These findings contribute to understanding protocell electrical properties.

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    Amino acids.

    The Scientific monthly·2010

    Area of Science:

    • Biophysics
    • Origin of Life Research
    • Synthetic Biology

    Background:

    • Proteinoid microspheres are self-assembling structures formed from heated amino acids.
    • These microspheres are considered potential models for primitive cells (protocells).
    • Understanding the electrical properties of protocell models is crucial for origin of life studies.

    Purpose of the Study:

    • To investigate the electrical properties of proteinoid microspheres.
    • To determine if proteinoid microspheres can generate membrane potentials, oscillations, and action potentials.
    • To assess the influence of vesicle composition on electrical activity.

    Main Methods:

    • Proteinoid microspheres were synthesized via thermal polymerization of amino acids.
    • Microspheres were impaled with microelectrodes filled with 3 M KCl.
    • Electrical membrane potentials, oscillations, and action potentials were recorded.

    Main Results:

    • Electrical membrane potentials, oscillations, and action potentials were successfully observed in proteinoid microspheres.
    • Substantial electrical activity was noted, with some cases reaching 20 mV amplitude.
    • The presence of glycerol and lecithin enhanced the magnitude of these electrical effects.

    Conclusions:

    • Proteinoid microspheres demonstrate inherent electrical excitability.
    • These findings add electrical potential properties to the known characteristics of proteinoid microspheres as protocell models.
    • The study supports the role of proteinoid microspheres in exploring the biophysical basis of early cellular life.

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