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Porphyromonas gingivalis as a Model Organism for Assessing Interaction of Anaerobic Bacteria with Host Cells
Published on: December 17, 2015
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Spheres of influence: Porphyromonas gingivalis outer membrane vesicles
M J Gui1, S G Dashper1, N Slakeski1
1Oral Health Cooperative Research Centre, Melbourne Dental School, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Victoria, Vic, Australia.
Molecular Oral Microbiology
|October 16, 2015
Summary
Outer membrane vesicles (OMVs) from Porphyromonas gingivalis, crucial for pathogenicity, are formed by lipid-induced membrane curvature. These OMVs deliver virulence factors and nutrients, aiding biofilm development and host colonization.
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Nanotechnology
Background:
- Outer membrane vesicles (OMVs) are key nanostructures for Gram-negative bacteria.
- Porphyromonas gingivalis uses OMVs as virulence factors in chronic periodontitis.
- OMV biogenesis mechanisms remain largely unknown.
Purpose of the Study:
- To elucidate the biogenesis mechanisms of Porphyromonas gingivalis OMVs.
- To understand how OMVs achieve significant membrane curvature.
- To identify the role of lipids and proteins in OMV formation.
Main Methods:
- Investigated lipid and protein composition of P. gingivalis OMVs.
- Proposed a model for OMV biogenesis involving membrane curvature.
- Analyzed the role of anionic lipopolysaccharide (A-LPS) and CTD-family proteins.
Main Results:
- OMV biogenesis requires energy for membrane curvature, potentially driven by lipid upregulation.
- Anionic lipopolysaccharide (A-LPS) and CTD-family proteins are selectively enriched in OMVs.
- Deacylation of A-LPS may facilitate increased curvature and OMV formation.
Conclusions:
- P. gingivalis OMVs are enriched in gingipains, supporting coaggregation and biofilm development.
- OMVs contribute to host interaction, immune evasion, and tissue destruction.
- OMVs are vital for nutrient capture, benefiting the bacterium and biofilm community.
Keywords:
Porphyromonas gingivalisbiofilmlipids/lipopolysaccharidesmembrane curvatureouter membrane vesicle biogenesisvirulenceMore Related Videos
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