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Membrane fluidity in Bacillus subtilis. Physical change and biological adaptation
1Department of Microbiology, Faculty of Science, Charles University, Prague.
Folia Microbiologica
|January 1, 1988
Summary
Bacillus subtilis membrane fluidity significantly changes with cultivation temperature, challenging the concept of homeoviscous adaptation. This study reveals a notable 30% difference in membrane microviscosity between cells grown at 20 and 40 degrees C.
Area of Science:
- Microbiology
- Biophysics
- Cell Biology
Background:
- Cell membranes maintain fluidity across temperatures through homeoviscous adaptation.
- Bacillus subtilis is a model organism for studying bacterial membrane dynamics.
Purpose of the Study:
- To investigate the thermotropic behavior of membrane phospholipids in intact Bacillus subtilis cells.
- To reevaluate the physiological significance of homeoviscous adaptation in B. subtilis.
Main Methods:
- Cultivation of Bacillus subtilis at different temperatures (20°C and 40°C).
- Estimation of membrane fluidity (microviscosity) using 1,6-diphenyl-1,3,5-hexatriene fluorescence anisotropy.
Main Results:
- Membrane fluidity of intact B. subtilis cells is highly dependent on ambient cultivation temperature.
- A 30% difference in membrane microviscosity was observed between cells grown at 20°C and 40°C.
- Bulk-phase lipid fluidity showed a lack of rigorous homeostatic control.
Conclusions:
- The homeoviscous adaptation mechanism in Bacillus subtilis may not operate as rigorously as previously thought.
- Environmental temperature significantly impacts bacterial membrane fluidity, necessitating a reevaluation of adaptation strategies.