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Crowding-induced morphological changes in synthetic lipid vesicles determined using smFRET.

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|November 17, 2022
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Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Lipid vesicles are crucial for studying membrane properties and are used in bio-inspired technologies.
  • The impact of external molecular crowding on vesicle shape is not well understood due to limited nanoscale imaging tools.

Purpose of the Study:

  • To investigate how molecular crowding influences lipid vesicle morphology.
  • To explore the potential of controlling vesicle architecture for applications like drug delivery.

Main Methods:

  • Utilized biocompatible polymers to simulate molecular crowding in vitro.
  • Employed Förster resonance energy transfer (FRET) spectroscopy, lifetime analysis, dynamic light scattering, and single-vesicle imaging.

Main Results:

  • Observed vesicle compaction in response to sorbitol, polyethylene glycol (PEG), and Ficoll.
  • Discovered that sorbitol-induced compaction is irreversible, while PEG-induced compaction is reversible.
  • Demonstrated that molecular crowding precisely regulates vesicle architecture.

Conclusions:

  • Molecular crowding offers a method to control and modify vesicle morphology in vitro.
  • Vesicle compaction by crowding may serve as a biosensor for extramembrane crowding.
  • Findings have significant implications for drug delivery and vesicle trafficking systems.