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Binding of a bacteriophage to wall-membrane adhesion in proteus mirabilis
Abstract:
A bacteriophage was shown to adsorb to plasmolyzed non-swarming cells of Proteus mirabilis preferentially at the sites of adhesion between the inner membrane and outer cell wall membrane; 75% of phage particles were adsorbed at these sites, while 25% were not. Differences in outer membrane composition between swarming and non-swarming cells were reflected in altered phage-binding properties, with only 33% of phage absorbed at these adhesion sites in swarming cells. On the basis of their phage distribution, cross-sections of swarm cells could be distinguished from sections of short non-swarming cells.
Insights
Bacteriophages bind to specific adhesion sites on non-swarming Proteus mirabilis cells. Swarming cells exhibit altered outer membrane composition, affecting bacteriophage binding and allowing distinction between cell types.
Area of Science:
- Microbiology
- Bacteriophage Research
- Cellular Biology
Background:
- Proteus mirabilis exhibits distinct swarming and non-swarming phenotypes.
- Bacteriophages are viruses that infect bacteria and can be specific in their host interactions.
- Cellular surface structures play a crucial role in bacterial-phage interactions.
Purpose of the Study:
- To investigate the preferential adsorption sites of bacteriophages on Proteus mirabilis cells.
- To determine if differences in outer membrane composition between swarming and non-swarming cells affect phage binding.
- To assess the potential of phage distribution patterns for distinguishing between P. mirabilis cell types.
Main Methods:
- Observation of bacteriophage adsorption to plasmolyzed non-swarming Proteus mirabilis cells using electron microscopy.
- Comparison of phage adsorption patterns on non-swarming versus swarming P. mirabilis cells.
- Analysis of outer membrane composition differences between swarming and non-swarming cells.
Main Results:
- Bacteriophages preferentially adsorbed to adhesion sites between the inner and outer cell wall membranes in non-swarming P. mirabilis (75% of particles).
- Swarming P. mirabilis cells showed significantly reduced phage adsorption at these sites (33%), indicating altered phage-binding properties due to outer membrane composition differences.
- Phage distribution patterns in cell cross-sections allowed for clear distinction between swarming and non-swarming P. mirabilis cells.
Conclusions:
- Adhesion sites between the inner and outer cell wall membranes are key targets for bacteriophage adsorption in non-swarming Proteus mirabilis.
- Changes in outer membrane composition during swarming significantly impact bacteriophage binding specificity.
- Bacteriophage adsorption patterns can serve as a reliable method for differentiating between swarming and non-swarming P. mirabilis phenotypes.