Related Experiment Video
Updated: Apr 4, 2026
06:45
Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
Published on: January 18, 2014
9.1K
Cannibalism stress response in Bacillus subtilis
Carolin Höfler1, Judith Heckmann1, Anne Fritsch1
1Department Biology I, Ludwig-Maximilians-Universität München, Großhaderner Strasse 2-4, 82152 Planegg-Martinsried, Germany.
Microbiology (Reading, England)
|September 14, 2015
Summary
Bacillus subtilis uses cannibalism toxins to delay sporulation. The cell envelope stress response (CESR) helps it survive starvation, with specific toxins triggering protective mechanisms.
Area of Science:
- Microbiology
- Bacterial Physiology
- Cellular Stress Response
Background:
- Bacillus subtilis employs sporulation for survival under nutrient limitation.
- Cannibalism, involving toxins like sporulation delaying protein (SDP) and sporulation killing factor (SKF), delays sporulation by lysing sibling cells for nutrients.
- The cell envelope stress response (CESR) plays a role in stationary-phase survival.
Purpose of the Study:
- To investigate the role of CESR, particularly Bce-like antimicrobial peptide detoxification modules, in the cannibalism stress response of Bacillus subtilis.
- To understand how cannibalism toxins (SDP and SKF) interact with and induce CESR pathways.
Main Methods:
- Analysis of gene expression in stationary-phase Bacillus subtilis cultures.
- Investigating the induction of Bce-like systems and extracytoplasmic function sigma factors by cannibalism toxins.
- Differentiating the effects of toxin precursors versus mature toxins on CESR activation.
Main Results:
- SDP and SKF toxins specifically induce Bce-like systems and extracytoplasmic function sigma factors in stationary-phase cultures.
- Extracytoplasmic function sigma factors offer partial protection against cannibalism-induced stress.
- A complete Bce response requires mature toxins, not their precursors.
Conclusions:
- The cell envelope stress response is intricately linked to stationary-phase survival strategies in Bacillus subtilis.
- Cannibalism toxins modulate CESR, highlighting a complex interplay between survival mechanisms.
- Understanding CESR provides insights into Bacillus subtilis adaptation and survival under stress.
Related Concept Videos
01:23Stringent Response in E. coli
469
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
469
01:30Other Stress Responses in Bacteria
520
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
520
01:17Gene Regulation During Sporulation
650
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
650
01:28Regulation of Bacterial Virulence
39
Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
39