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Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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The Secret Ballet Inside Multivesicular Bodies.

Luis S Mayorga1,2, Diego Masone1,3

  • 1Instituto de Histología y Embriología de Mendoza (IHEM), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo (UNCuyo), 5500 Mendoza, Argentina.

ACS Nano
|June 3, 2024
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Summary
This summary is machine-generated.

Lipid bilayers in confined spaces self-organize into diverse, repeating geometric shapes. These findings reveal fundamental principles of lipid self-assembly and could inspire new biomaterials.

Keywords:
leaflet segmentationlimit shapeslipid monolayersmolecular dynamicsmultivesicular bodies

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Area of Science:

  • Biophysics
  • Materials Science
  • Soft Matter Physics

Background:

  • Lipid bilayers self-assemble due to amphipathic molecule properties.
  • Confinement leads to diverse, experimentally challenging lipid bilayer shapes.
  • Lipid structures are key for bio-inspired materials and nanobio-interfaces.

Purpose of the Study:

  • To investigate the self-organization dynamics of confined lipid bilayers in multivesicular bodies.
  • To identify recurring geometric patterns and emergent shapes in numerical simulations.
  • To understand the principles governing lipid body spontaneous organization.

Main Methods:

  • Numerical simulations of multivesicular bodies.
  • Analysis of lipid bilayer dynamics and shape evolution under confinement.
  • Identification and classification of emergent geometric structures.

Main Results:

  • Observed evolution from order to higher entropy states over time.
  • Identified five fundamental repeating structures under various conditions.
  • Discovered complex and less frequent emergent shapes in confined environments.
  • Revealed dynamic rearrangements leading to unexpected limit shapes.

Conclusions:

  • Confined lipid bodies exhibit spontaneous self-organization into predictable and emergent geometric patterns.
  • The identified basic building blocks provide a framework for understanding multivesicular system dynamics.
  • Insights advance the design of novel biomimetic materials and nanobio-interfaces.