Related Experiment Video
Updated: Jun 2, 2026
06:03
Procedure for Adaptive Laboratory Evolution of Microorganisms Using a Chemostat
Published on: September 20, 2016
Bacillus cereus responses to acid stress
1Molecular Genetics Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Groningen, the Netherlands. j.m.mols@rug.nl
Environmental Microbiology
|May 11, 2011
Summary
Bacillus cereus survives acidic conditions, crucial for its soil and human pathogen roles. This review details its cellular and spore responses to various organic acids, revealing damage, defense, and adaptation mechanisms.
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Environmental Adaptation
Background:
- Bacillus cereus requires acid tolerance for soil saprophytic and human pathogenic lifestyles.
- Understanding acid stress responses is vital for controlling B. cereus in diverse environments.
Purpose of the Study:
- To review novel insights into B. cereus responses to low pH and organic acids.
- To compile information on acid-induced damage, physiological changes, and protective mechanisms.
Main Methods:
- Single cell fluorescence microscopy
- Flow cytometry
- Transcriptome analyses
Main Results:
- Vegetative cells and germinating spores exhibit distinct responses to acid stress.
- Specific organic acids like acetic, lactic, and sorbic acid trigger unique adaptive strategies.
- Mechanisms involve cellular damage, physiological adjustments, and protective systems.
Conclusions:
- B. cereus employs sophisticated mechanisms to cope with acidic environments.
- These adaptations are critical for its survival and pathogenicity.
- Further research can inform strategies to mitigate B. cereus risks.
Related Concept Videos
01:30Other Stress Responses in Bacteria
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...
01:23Stringent Response in E. coli
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...
02:02Responses to Salt Stress
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
02:45Responses to Heat and Cold Stress
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
01:20Endospores and Sporulation
Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...
01:17Gene Regulation During Sporulation
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...