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Size Exclusion Chromatography to Analyze Bacterial Outer Membrane Vesicle Heterogeneity
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Proteomic Profiling Reveals Distinct Bacterial Extracellular Vesicle Subpopulations with Possibly Unique

Hannah M McMillan1, Meta J Kuehn1,2

  • 1Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina, USA.

Applied and Environmental Microbiology
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Summary

Bacterial outer membrane vesicles (OMVs) from pathogenic and beneficial bacteria differ in protein cargo based on growth conditions. These vesicles play roles in plant immunity, bacterial virulence, and stress adaptation, with distinct vesicle types identified.

Keywords:
Pseudomonasextracellular vesicleouter membrane vesicleplant immunityplant pathogensproteomics

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Area of Science:

  • Microbiology
  • Plant Pathology
  • Biochemistry

Background:

  • Bacterial outer membrane vesicles (OMVs) mediate interkingdom communication between bacteria and plants.
  • OMVs from pathogenic and beneficial strains elicit plant immune responses, influencing seedling growth and pathogen defense.
  • Previous research indicates differences in OMV protein composition between Pseudomonas syringae and Pseudomonas fluorescens, affected by culture conditions.

Purpose of the Study:

  • To investigate the impact of different medium conditions on the protein cargo of OMVs from pathogenic (P. syringae) and beneficial (P. fluorescens) bacteria.
  • To identify proteins associated with OMV-mediated bacterial virulence, plant immune activation, and bacterial stress tolerance.
  • To explore potential differences in vesicle biogenesis and cargo loading between pathogenic and beneficial bacteria.

Main Methods:

  • Culturing Pseudomonas syringae and Pseudomonas fluorescens in complete and minimal media mimicking the plant apoplast.
  • Comparative proteomic analysis of OMVs isolated from bacteria grown under different conditions.
  • Bioinformatic analysis, including localization enrichment, to identify protein functions and potential vesicle subpopulations.

Main Results:

  • Minimal medium conditions significantly altered OMV protein content in P. syringae but not P. fluorescens.
  • Specific protein subsets were linked to bacterial virulence, plant immune activation, and bacterial stress tolerance.
  • Analysis suggested the presence of outer-inner membrane vesicles (OIMVs) involved in bacterial stress responses.

Conclusions:

  • Distinct bacterial extracellular vesicle populations with diverse functional roles exist, influenced by medium conditions.
  • Pathogenic and beneficial bacteria exhibit different strategies for vesicle cargo loading and biogenesis in response to environmental cues.
  • OMVs are implicated in virulence, while OIMVs are associated with bacterial stress tolerance in plant-associated bacteria.