Related Experiment Video
Updated: Jul 20, 2026
06:26
Time-lapse Imaging of Bacterial Swarms and the Collective Stress Response
Published on: May 23, 2020
Quorum sensing in Erwinia species
Anne M L Barnard1, George P C Salmond
1Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, UK.
Analytical and Bioanalytical Chemistry
|September 1, 2006
Summary
Quorum sensing (QS) regulates bacterial gene expression. This review covers QS networks in soft rot erwiniae, focusing on their virulence and metabolite production via N-acyl homoserine lactones and AI-2 signals.
Area of Science:
- Microbiology
- Bacterial Genetics
- Plant Pathology
Background:
- Quorum sensing (QS) is a cell-to-cell communication mechanism used by bacteria to coordinate gene expression based on population density.
- The erwiniae bacterial group includes significant phytopathogens, with virulence factors and secondary metabolites often regulated by QS.
- Erwiniae employ two primary QS signaling molecules: N-acyl homoserine lactones (AHLs) and AI-2 type molecules.
Purpose of the Study:
- To review the regulatory networks involving quorum sensing in soft rot erwiniae.
- To highlight the role of QS in controlling virulence determinants and secondary metabolite production in these bacteria.
Main Methods:
- Literature review of existing research on quorum sensing in erwiniae.
- Analysis of regulatory networks controlling gene expression in soft rot erwiniae.
- Examination of the types and roles of signaling molecules utilized by erwiniae.
Main Results:
- Quorum sensing is a critical regulatory system in soft rot erwiniae.
- QS controls the expression of key virulence factors essential for phytopathogenicity.
- Erwiniae utilize both N-acyl homoserine lactones and AI-2 signaling molecules for QS.
Conclusions:
- Understanding QS networks in erwiniae is crucial for managing plant diseases caused by these pathogens.
- QS regulation impacts the pathogenicity and ecological fitness of soft rot erwiniae.
- Further research into these QS systems could lead to novel disease control strategies.
Related Concept Videos
01:28Gene Regulation in Microbial Communities: Quorum Sensing
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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...
01:23Stringent 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...
01:28Global 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...
01:27Chemotaxis in E. coli
Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
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...