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Related Experiment Videos

Nutrient uptake by protocells: a liposome model system.

P A Monnard1, D W Deamer

  • 1Department of Chemistry and Biochemistry, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 96064, USA.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|April 12, 2001
PubMed
Summary

Early protocells could have used passive diffusion for nutrient uptake. This process allowed essential molecules like ATP to enter vesicles while retaining larger products, supporting primitive cellular life.

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Area of Science:

  • Biochemistry
  • Origin of Life Research
  • Synthetic Biology

Background:

  • Liposome models are crucial for understanding protocell development.
  • Existing models lack essential nutrient uptake mechanisms found in contemporary cells.
  • Primitive cells required efficient nutrient transport for survival and function.

Purpose of the Study:

  • To investigate passive diffusion as a nutrient uptake mechanism for early protocells.
  • To determine if essential substrates can permeate lipid bilayers at sufficient rates.
  • To assess the selective retention of polymerization products within protocell models.

Main Methods:

  • Utilized liposome-based protocell models.
  • Investigated the passive diffusion of various solutes across lipid bilayers.

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  • Measured the permeation rates of substrates like ATP.
  • Analyzed the retention of polymerization products, including dimers and transfer RNA.

    • Main Results:

    • Established conditions for passive diffusion of ionic substrates up to ATP across lipid bilayers.
    • Demonstrated permeation rates sufficient to supply encapsulated RNA polymerase.
    • Observed selective retention of polymerization products, from dimers to transfer RNA.
    • Confirmed that lipid bilayers can act as selective barriers.

    Conclusions:

    • Passive diffusion is a viable nutrient uptake mechanism for early protocells.
    • This mechanism could support essential cellular processes like RNA polymerization.
    • Lipid bilayers offer selective permeability crucial for primitive life.
    • Passive diffusion could facilitate the transport of amino acids, phosphate, and phosphorylated organic solutes.