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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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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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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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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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Simple sugars shape giant vesicles into multispheres with many membrane necks.

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Simple sugars like glucose and sucrose create unique multi-balloon vesicle shapes in fully hydrated membranes. These sugar-lipid interactions induce spontaneous curvature, offering potential for novel reaction chambers.

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Area of Science:

  • Biophysics
  • Materials Science
  • Cell Biology

Background:

  • Simple sugars (glucose, sucrose) protect biomembranes against dehydration.
  • Previous studies focused on single sugars and low hydration levels.
  • Understanding sugar-lipid interactions is crucial for biomembrane stability.

Purpose of the Study:

  • Investigate sugar-lipid interactions in fully hydrated lipid membranes using giant vesicles.
  • Examine the effects of asymmetric sugar solutions (glucose and sucrose) on vesicle morphology.
  • Quantify the spontaneous curvature induced by sugar-lipid interactions.

Main Methods:

  • Utilized giant unilamellar vesicles (GUVs).
  • Employed osmotically balanced interior and exterior solutions with differing sugar compositions (sucrose inside, glucose outside).
  • Analyzed vesicle shapes using microscopy to observe morphology changes.

Main Results:

  • Observed novel multispherical or "multi-balloon" vesicle shapes.
  • Demonstrated that sugar asymmetry generates significant spontaneous curvature (~1 μm⁻¹).
  • Identified stable multispherical morphologies with a rugged free energy landscape.

Conclusions:

  • Asymmetric sugar-lipid interactions drive significant spontaneous curvature in hydrated membranes.
  • Multispherical vesicles represent a stable morphology with potential applications.
  • Future work should focus on controlling neck formation for use as metamorphic chambers.