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Related Experiment Videos

Filled pore approximation: a theoretical framework for solute-solvent coupling in narrow water channels

D J Welling1, P A Welling, L W Welling

  • 1Research Service, Veterans Affairs Medical Center, Kansas City, Missouri 64128, USA.

The American Journal of Physiology
|April 1, 1996
PubMed
Summary

A new phenomenological model explains water and solute transport in narrow pores, considering variable unoccupied volume. This model offers insights into molecular interactions and transport properties in channels like aquaporin 1.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Membrane Transport

Background:

  • Water and solute transport through biological pores is crucial for cellular function.
  • Existing models, like the single-file model, have limitations in describing transport in very narrow channels.
  • Understanding these transport mechanisms is key to comprehending processes in kidney tubules and water channels.

Purpose of the Study:

  • To present a new phenomenological model for water and solute transport in narrow pores (< 2 Å radius).
  • To account for variations in unoccupied volume within pores, differing from conventional models.
  • To relate pore volume, frictional coefficients, and transport permeabilities.

Main Methods:

  • Developed a phenomenological model for water and solute transport.

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  • Incorporated variable unoccupied volume within the pore model.
  • Related accessible unoccupied volume to mechanical frictional coefficients.

    • Main Results:

    • The model accurately describes transport in channels like gramicidin A and aquaporin 1.
    • Accessible unoccupied volume correlates with frictional coefficients and permeabilities.
    • A solute's reflection coefficient can remain high (~0.5) even with low diffusive permeability.
    • Predicted a minimum effective pore radius of 1.78 Å for water channels.

    Conclusions:

    • The model provides a framework for understanding transport in sub-nanometer pores.
    • Variable unoccupied volume is critical for accurately modeling single-file transport.
    • The findings are consistent with experimental observations in biological systems like proximal tubules.