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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Protein Charge Neutralization Is the Proximate Driver Dynamically Tuning Reflectin Assembly.

Robert Levenson1,2, Brandon Malady2, Tyler Lee2

  • 1Life Sciences, Soka University of America, Aliso Viejo, CA 92656, USA.

International Journal of Molecular Sciences
|August 29, 2024
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Summary
This summary is machine-generated.

Squid reflectin protein self-assembles by reducing its net charge, controlling color and brightness. This charge-driven assembly mechanism in reflectin proteins offers precise biological light manipulation.

Keywords:
biomaterialsintrinsically disordered proteinsprotein assemblyreflectins

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Area of Science:

  • Biophysics
  • Materials Science
  • Structural Biology

Background:

  • Reflectin, a protein in squid iridocytes, controls dynamic color and brightness by altering nanostructured Bragg reflectors.
  • Neuronal activation triggers reflectin phosphorylation, causing assembly and osmotic dehydration, which modifies lamellar structure and optical properties.

Purpose of the Study:

  • To investigate the in vitro mechanisms of reflectin assembly and its relationship with charge reduction.
  • To establish a physical model for reflectin's charge-regulated assembly and its role in biological light manipulation.

Main Methods:

  • Purification and characterization of recombinant reflectin.
  • In vitro assembly induction via anionic screening (salt) and pH titration to reduce net charge.
  • Analysis of assembly size, charge neutralization, and dynamic arrest of multimer growth.

Main Results:

  • Reduced net charge in purified reflectin directly correlates with increased multimeric assembly size.
  • Assembly size is precisely proportional to charge neutralization, regulated by Coulombic repulsion and short-range forces.
  • Dynamic arrest of assembly ensures stable control over particle concentration and optical output.

Conclusions:

  • Reflectin assembly is primarily driven by charge reduction, mimicking in vivo phosphorylation effects.
  • This charge-based mechanism allows for precise, calibrated control over nanostructure formation and optical properties.
  • Reflectin functions as a charge-regulated, colligative property-based nanostructured biological machine for light modulation.