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Updated: May 13, 2026
09:25
Purification of Pathogen Vacuoles from Legionella-infected Phagocytes
Published on: June 19, 2012
Isolation of pathogen-containing vacuoles
Olga Shevchuk1, Michael Steinert
1Institut für Mikrobiologie, Technische Universität Braunschweig, Braunschweig, Germany.
Methods in Molecular Biology (Clifton, N.J.)
|March 16, 2013
Summary
This study introduces a new method to isolate pathogen-containing vacuoles (PCVs) from Dictyostelium discoideum. This technique aids in understanding how bacteria like Legionella pneumophila survive inside host cells.
Area of Science:
- Cell Biology
- Microbiology
- Biochemistry
Background:
- Dictyostelium discoideum are professional phagocytes, engulfing various particles.
- Bacterial pathogens can survive within D. discoideum vacuoles by manipulating host pathways.
Purpose of the Study:
- To develop a method for isolating pathogen-containing vacuoles (PCVs).
- To investigate molecular mechanisms of intracellular pathogen survival.
Main Methods:
- Infection of D. discoideum with Legionella pneumophila.
- Isolation of PCVs using colloidal iron loading, mechanical lysis, INT labeling, Benzonase treatment, centrifugation, and magnetic separation.
- Subcellular fractionation via OptiPrep density gradients.
Main Results:
- High-purity PCVs were successfully isolated.
- Proteins from PCVs were analyzed by mass spectrometry, revealing pathogen-directed vacuole maturation.
- The method allows for subsequent protein modification and lipidome analyses.
Conclusions:
- The developed method enables the isolation and analysis of PCVs.
- This facilitates the study of host-pathogen interactions and vacuole dynamics.
- The technique is versatile for further proteomic and lipidomic investigations.
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