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Influence of Side-Chain Molecular Features on Aqueous Coacervation of Multifunctional Homopolypeptides.

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Updated: May 27, 2025

In Vesiculo Synthesis of Peptide Membrane Precursors for Autonomous Vesicle Growth
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Triggered Inversion of Dual Responsive Diblock Copolypeptide Vesicles.

Casey A Morrison1, Ethan P Chan1, Timothy J Deming1,2

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States.

Journal of the American Chemical Society
|February 20, 2025
PubMed
Summary
This summary is machine-generated.

Researchers created novel diblock copolypeptides that self-assemble into vesicles. These synthetic assemblies respond to stimuli, disrupting or inverting into new structures, showing potential for biomedical applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials

Background:

  • Amphiphilic block copolymers are crucial for self-assembly into nanostructures.
  • Developing synthetic materials that mimic biological functions is a key challenge in materials science.

Purpose of the Study:

  • To synthesize and characterize novel amphiphilic diblock copolypeptides, poly(l-methionine sulfoxide)-b-poly(dehydroalanine) (MA).
  • To investigate the self-assembly behavior of these copolypeptides into unilamellar vesicles.
  • To explore the stimuli-responsive properties of these vesicles for potential biomedical applications.

Main Methods:

  • Synthesis of amphiphilic poly(l-methionine sulfoxide)-b-poly(dehydroalanine) diblock copolypeptides.
  • Characterization of self-assembled structures using microscopy and dynamic light scattering.
  • Stimuli-responsive studies involving incubation with glutathione and thiolglycolic acid under physiological conditions.

Main Results:

  • Successfully synthesized MA copolypeptides that self-assemble into submicrometer unilamellar vesicles.
  • Vesicle formation occurred over a wide range of compositions due to unique hydrophobic segment properties.
  • Vesicles demonstrated stimuli-responsive behavior, undergoing disruption with glutathione and inversion with thiolglycolic acid.

Conclusions:

  • The MA copolypeptides form stable, responsive vesicles in aqueous media.
  • The ability to disrupt or invert vesicles using biologically relevant stimuli at physiological conditions is unprecedented.
  • These findings offer new avenues for developing advanced functional synthetic assemblies for biological and medical applications.