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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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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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The ER, Golgi apparatus, endosomes, and lysosomes work in tandem to modify, sort, and package proteins and lipids. An integrated membrane trafficking network facilitates the back and forth shuttling of molecules within different organelles in the same cell or across the cell membrane.
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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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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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Outer Membrane Vesicles: Biogenesis, Functions, and Issues.

Rokas Juodeikis1, Simon R Carding1,2

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Summary
This summary is machine-generated.

This review explores non-lytic outer membrane vesicles (OMVs), detailing their creation, contents, and roles in Gram-negative bacteria. It addresses challenges in identifying OMVs and improving research methods for bacterial extracellular vesicles (BEVs).

Keywords:
outer membrane vesicles

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Size Exclusion Chromatography to Analyze Bacterial Outer Membrane Vesicle Heterogeneity
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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacterial extracellular vesicles (BEVs) are crucial for intercellular communication.
  • Outer membrane vesicles (OMVs) are a significant subtype of BEVs produced by Gram-negative bacteria.
  • Understanding OMV biogenesis, cargo, and function is vital in microbiology.

Purpose of the Study:

  • To review the mechanisms of non-lytic outer membrane vesicle (OMV) biogenesis, cargo, and function.
  • To identify challenges in characterizing OMVs and differentiating them from other bacterial extracellular vesicles (BEVs).
  • To highlight limitations in current BEV study methodologies and propose standardized protocols.

Main Methods:

  • Literature review of studies on bacterial extracellular vesicles (BEVs) and outer membrane vesicles (OMVs).
  • Analysis of methodologies used for OMV and BEV characterization and functional studies.
  • Critical evaluation of existing research protocols and their impact on data interpretation.

Main Results:

  • Nonlytic OMVs are produced by Gram-negative bacteria through specific biogenesis pathways.
  • OMVs carry diverse cargo, influencing host-pathogen interactions and bacterial physiology.
  • Current methods for OMV and BEV characterization present significant challenges, impacting functional interpretations.

Conclusions:

  • Standardizing protocols for OMV and BEV research is essential for accurate functional assessment.
  • Further research is needed to refine OMV characterization and understand their roles in microbial systems.
  • Addressing methodological limitations will advance the field of bacterial extracellular vesicle research.