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Single-cell Analysis of Bacillus subtilis Biofilms Using Fluorescence Microscopy and Flow Cytometry
Published on: February 15, 2012
Formation of competent Bacillus subtilis cells
Journal of Bacteriology
|February 1, 1983
Summary
Competent cell formation in Bacillus subtilis involves early sporulation stages and nutrient-dependent factors. Inhibitors of vegetative growth and sporulation block competence, suggesting shared developmental pathways.
Area of Science:
- Microbiology
- Bacterial genetics
- Cellular differentiation
Background:
- Competent cell formation is crucial for bacterial transformation.
- Bacillus subtilis undergoes complex developmental changes, including competence and sporulation.
- Understanding the regulation of competence is key to harnessing bacterial genetic manipulation.
Purpose of the Study:
- To investigate the relationship between competent cell formation and early sporulation in Bacillus subtilis.
- To identify factors and conditions that influence the development of competence.
- To elucidate shared regulatory pathways between competence and sporulation.
Main Methods:
- Utilized early-stationary-phase (T1) Bacillus subtilis cells.
- Assessed the impact of various inhibitors (Rifampin, chloramphenicol, tunicamycin, ethanol) on competence.
- Examined competence development in D-alanine-requiring mutants and spo0 mutants.
- Monitored extracellular serine protease activity.
Main Results:
- Rifampin, chloramphenicol, and tunicamycin inhibited both competence and growth.
- Methicillin and hydroxyphenylazouracil did not inhibit competence.
- Ethanol blocked competence, indicating a link to early sporulation events.
- Spo0 mutations (except spo0C, spo0G, spo0J) repressed competence.
- Competent cells were formed in sporulation-supporting media.
Conclusions:
- Competent cells originate from early sporulating cells, requiring cell wall synthesis and nutrient-activated factors.
- Common cellular processes may be involved in forespore septation and competent cell formation.
- The development of competence is tightly linked to the initiation of sporulation in Bacillus subtilis.
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