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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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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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Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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Updated: Jun 17, 2025

Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification
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Directed Protein Packaging within Outer Membrane Vesicles from Escherichia coli: Design, Production and Purification

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Engineering Outer Membrane Vesicles to Carry Enzymes: Encapsulation, Isolation, Characterization, and Modification.

Meghna Thakur1,2, Scott N Dean3

  • 1Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC, USA.

Methods in Molecular Biology (Clifton, N.J.)
|August 14, 2024
PubMed
Summary
This summary is machine-generated.

Researchers engineered outer membrane vesicles (OMVs) from E. coli to package enzymes. Modified OMVs protected enzyme activity under harsh conditions, enhancing their potential for biomedical applications.

Keywords:
EnzymesMembrane vesicles (MVs)OMV engineeringOuter membrane vesicles (OMVs)PurificationSynthetic biology

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

  • Microbiology
  • Biotechnology
  • Biochemistry

Background:

  • Outer membrane vesicles (OMVs) are nanoscale proteoliposomes released by Gram-negative bacteria.
  • OMVs are involved in bacterial defense, pathogenesis, and intercellular signaling.
  • Engineered OMVs offer potential for advanced biomedical and biochemical applications.

Purpose of the Study:

  • To describe methods for directed enzyme packaging into E. coli OMVs.
  • To detail strategies for enhancing OMV stability and enzyme activity protection.

Main Methods:

  • Engineered molecular systems for enzyme localization on OMVs (inner/outer surface).
  • Modification strategies including lyophilization and surfactant conjugation.
  • Testing enzyme activity under non-physiological conditions (elevated temperature, organic solvents, freeze/thaw).

Main Results:

  • Successful directed packaging of enzymes into OMVs.
  • Enhanced protection of enzyme activity in modified OMVs compared to free enzymes.
  • OMV modifications preserved enzyme function under stress conditions.

Conclusions:

  • Engineered OMVs can effectively package and stabilize enzymes.
  • OMV modification strategies improve enzyme resilience for biotechnological use.
  • This approach broadens the application scope of bacterial outer membrane vesicles.