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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Biomolecular Condensates are Characterized by Interphase Electric Potentials.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Biophysics
  • Cell Biology

Background:

  • Biomolecular condensates are essential cellular structures formed by phase separation of macromolecules.
  • These condensates can exist as multiphase systems with distinct dense and dilute phases.
  • Understanding the physicochemical properties of these phases is crucial for comprehending condensate function.

Purpose of the Study:

  • To investigate the partitioning behavior of solution ions across coexisting phases within protein and RNA condensates.
  • To measure and characterize the interphase electric potentials generated by asymmetric ion distribution.
  • To explore the functional implications of these potentials, particularly regarding charge storage and electrochemical activity.

Main Methods:

  • Direct potentiometric measurements of cation and anion activities within coexisting phases of biomolecular condensates.
  • Formation of condensates using intrinsically disordered proteins and homopolymeric RNA molecules.
  • Analysis of ion partitioning as a function of protein sequence, macromolecular composition, salt concentration, and ion type.

Main Results:

  • Demonstrated asymmetric partitioning of solution ions across coexisting phases of protein and RNA condensates.
  • Quantified Donnan and Nernst potentials arising from ion asymmetry, comparable in magnitude to membrane potentials.
  • Established a correlation between interphase potentials and condensate properties, revealing their capacity to store charge.

Conclusions:

  • Asymmetric ion partitioning in biomolecular condensates generates significant interphase electric potentials.
  • These potentials indicate that condensates function as capacitors, storing electrical charge.
  • The findings provide a mechanistic basis for the observed electrochemical activity at condensate interfaces.