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Updated: Jun 5, 2026

Size Exclusion Chromatography to Analyze Bacterial Outer Membrane Vesicle Heterogeneity
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Published on: March 31, 2021

RNAs Associated With Bacterial Outer Membrane Vesicles: Structural Insights Into Surface Composition.

Kevin Mosca1,2,3, Florian Turbant1,2, Wafa Achouak4

  • 1Laboratoire Léon Brillouin, UMR 12 CEA/CNRS, CEA Saclay, Gif-sur-Yvette, France.

Journal of Extracellular Vesicles
|June 4, 2026
PubMed
Summary
This summary is machine-generated.

Gram-negative bacteria export RNA within outer membrane vesicles (OMVs). The Hfq chaperone facilitates RNA insertion into the OMV membrane, enabling direct host delivery and novel cell-to-cell communication.

Keywords:
Bacterial amyloidHfqHost immune responseMembrane insertionOuter Membrane Vesicle (OMV)RNASynchrotron Radiation Oriented Circular Dichroism SR‐O‐CDTrans‐kingdom communication

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Gram-negative bacteria utilize outer membrane vesicles (OMVs) for host interaction, delivering virulence factors.
  • OMVs are increasingly recognized as carriers for bacterial RNAs, including small regulatory noncoding RNAs (sRNAs).
  • The Hfq RNA chaperone is crucial for sRNA function and has been previously shown to be exported within OMVs.

Purpose of the Study:

  • To investigate the role of the Hfq chaperone in the association of RNA with OMVs.
  • To determine if RNA molecules can be integrated into the OMV membrane.
  • To explore the implications of surface-presented RNAs on OMVs for host-bacterial interactions.

Main Methods:

  • Investigated Hfq-dependent translocation and export within OMVs.
  • Analyzed the localization of RNA molecules within and on the surface of OMVs.
  • Utilized techniques to assess the association of RNA with the OMV membrane.

Main Results:

  • RNA molecules are a significant component within the lumen of OMVs.
  • Hfq-dependent insertion of RNA molecules into the OMV membrane was demonstrated.
  • This Hfq-mediated surface presentation suggests direct RNA delivery to host cells.

Conclusions:

  • OMVs possess a previously unrecognized capacity to present RNA on their surface via an Hfq-dependent mechanism.
  • This finding expands the understanding of OMV-mediated cell-to-cell communication beyond protein interactions.
  • Further research is warranted to elucidate the functional significance of surface-associated RNAs in OMV-host interplay.