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Cell wall teichoic acid as a reserve phosphate source in Bacillus subtilis.
Journal of Bacteriology
|January 1, 1979
Summary
Bacillus subtilis 168 utilizes its own wall teichoic acids as a phosphate reserve during starvation. This internal phosphate source fuels continued bacterial growth when inorganic phosphate is depleted.
Area of Science:
- Microbiology
- Cell Biology
- Biochemistry
Background:
- Bacillus subtilis 168 growth is limited by inorganic phosphate availability.
- Phosphate is essential for bacterial nucleic acids, phospholipids, and energy metabolism.
Purpose of the Study:
- To investigate the mechanism of postexponential growth in Bacillus subtilis 168 under phosphate limitation.
- To determine the role of cell wall components, specifically teichoic acids, in phosphate homeostasis.
Main Methods:
- Culturing Bacillus subtilis 168 in phosphate-limited media.
- Monitoring bacterial growth post-phosphate exhaustion.
- Quantifying phosphate content in cell walls and culture media.
- Analyzing teichoic acid presence and phosphate content.
Main Results:
- Bacterial growth continued for 3-4 hours after inorganic phosphate depletion.
- This postexponential growth correlated with a decrease in cell wall teichoic acid.
- Phosphate from teichoic acids was mobilized and utilized by the bacteria.
- Addition of exogenous teichoic acid supported growth in phosphate-starved cells.
Conclusions:
- Teichoic acids serve as an internal reserve phosphate source for Bacillus subtilis 168.
- Mobilization of teichoic acid phosphate allows for continued growth during inorganic phosphate starvation.
- This mechanism highlights the dynamic role of cell wall components in bacterial nutrient management.