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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Sticker-Spacer Molecular Design Controls Coacervate Formation and Internal Microenvironments in Low-Molecular-Weight

Sayuri L Higashi1,2,3, Koichiro M Hirosawa4,5, Ryutaro Fujimoto6

  • 1Institute of Advanced Study, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.

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Summary
This summary is machine-generated.

Researchers developed simple coacervates from low-molecular-weight compounds for biomaterials. These coacervates can encapsulate hydrophobic drugs and release them on demand, offering new possibilities for soft materials and protocell models.

Keywords:
coacervatesliquid−liquid phase separationself-assemblystimuli responsivenesssupramolecular soft materials

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Area of Science:

  • Soft Matter Physics
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Coacervates are potential protocells, with recent focus on low-molecular-weight (LMW) compounds for biomaterial development.
  • LMW coacervates offer simple in vitro models for biomolecular condensates and functional biomaterials.

Purpose of the Study:

  • To present a modular molecular design for LMW coacervates via liquid-liquid phase separation.
  • To explore the properties and applications of these novel coacervates, including drug delivery and stabilization.

Main Methods:

  • Designed LMW compounds with aromatic/cycloalkane stickers and hydrophilic spacers for phase separation.
  • Investigated coacervate formation, internal microenvironment, and selective sequestration of guest molecules.
  • Demonstrated controlled drug release using reduction-responsive coacervates and stabilization with polysaccharides.

Main Results:

  • LMW compounds self-assembled into micrometer-scale coacervates at submillimolar concentrations.
  • Coacervates exhibited a hydrophobic internal microenvironment, selectively sequestering hydrophobic molecules.
  • Reduction-responsive coacervates enabled controlled drug release, and polysaccharide addition stabilized them against coalescence.

Conclusions:

  • A rational molecular design enables the construction of modulable LMW coacervates.
  • These coacervates show potential as biofunctional soft materials and platforms for protocell models.
  • Tailoring sticker groups allows fine-tuning of coacervate microenvironments and properties.