Related Experiment Video
Updated: Aug 6, 2026
12:41
Stress-induced Antibiotic Susceptibility Testing on a Chip
Published on: January 8, 2014
The RsbRST stress module in bacteria: a signalling system that may interact with different output modules
Jan Pané-Farré1, Richard J Lewis, Jörg Stülke
1Institut für Mikrobiologie, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Deutschland.
Journal of Molecular Microbiology and Biotechnology
|December 2, 2005
Summary
The stressosome (RsbRST module) is a conserved bacterial stress-sensing complex. Its genes are found across diverse bacteria, suggesting a universal role in stress response signaling.
Area of Science:
- Microbiology
- Bacterial Physiology
- Signal Transduction
Background:
- The alternative sigma factor sigma(B) in Bacillus subtilis regulates gene expression in response to environmental stress.
- Sigma(B) activity is modulated by a complex network of anti-sigma and anti-anti-sigma factors.
- The stressosome, a complex of RsbR, RsbS, and RsbT, controls the activity of the phosphatase RsbU, which releases sigma(B) under stress.
Purpose of the Study:
- To investigate the distribution and evolutionary conservation of the RsbRST module across diverse bacterial phyla.
- To understand the association of the RsbRST module with different regulatory systems in various bacteria.
- To explore the functional implications of the stressosome as a conserved signal sensing and transduction unit.
Main Methods:
- Bioinformatic analysis of bacterial genomes to identify the presence and genomic context of the RsbRST module genes.
- Comparative genomics to assess the conservation of the RsbRST module across different bacterial species.
- Literature review to synthesize existing knowledge on stressosome function and regulation.
Main Results:
- The RsbRST module, encoding stressosome proteins, is widely conserved across a broad range of bacterial taxa.
- In Bacillus subtilis and related species, the RsbRST module is typically found near the sigma(B) gene and its direct regulators.
- In diverse bacteria, including cyanobacteria, bacteroidetes, proteobacteria, and deinococci, the RsbRST module is frequently clustered with genes for two-component systems and phosphorelays.
Conclusions:
- The stressosome represents a highly conserved bacterial module for sensing and transducing environmental stress signals.
- The association of the RsbRST module with diverse regulatory systems highlights its adaptability and fundamental role in bacterial stress responses.
- The stressosome functions as a versatile input module that relays stress information to various output pathways across the bacterial kingdom.
Related Concept Videos
01:30Bacterial Signaling
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
01:07Cell Signaling Feedback Loops
Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
01:28Global Regulatory Systems
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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...
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...
01:28Regulation of Bacterial Virulence
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...