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The uptake of choline by Streptococcus pneumoniae
Journal of General Microbiology
|December 1, 1978
Summary
Bacteria efficiently uptake choline, a key component of teichoic acids, using an ATP-dependent system likely involving choline kinase. This system also transports ethanolamine, suggesting a shared mechanism for nutrient acquisition in bacteria.
Area of Science:
- Microbiology
- Bacterial Physiology
- Molecular Biology
Background:
- Choline is a vital structural component of pneumococcal C- and F-teichoic acids.
- Understanding nutrient uptake mechanisms is crucial for bacterial physiology research.
Purpose of the Study:
- To investigate the mechanism of choline uptake in bacteria.
- To identify the transport system and its energy requirements.
Main Methods:
- Bacterial growth in a defined medium.
- Choline uptake assays.
- Inhibition studies with specific compounds.
- Analysis of ethanolamine transport.
Main Results:
- Choline uptake was highly efficient (uptake constant [S]10 5 of 3.2 microns).
- Uptake was inhibited by iodoacetate, dinitrophenol, and oligomycin, indicating an energy-dependent process.
- Ethanolamine was transported by the same system, but with lower affinity ([S]0.5 71.4 microns).
Conclusions:
- A single constitutive transport system likely handles both choline and ethanolamine.
- The system appears to be ATP-dependent and may involve choline kinase.
- This finding sheds light on bacterial nutrient acquisition pathways.