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Related Concept Videos

Other Stress Responses in Bacteria01:30

Other 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...
Responses to Salt Stress02:02

Responses 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.
Stringent Response in E. coli01:23

Stringent 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...
Stress Response System01:21

Stress Response System

The stress response system, also known as the fight-or-flight response, is the body's automatic physiological reaction to perceived threats. Hans Selye introduced the concept of General Adaptation Syndrome (GAS) to describe the predictable pattern of changes that occur in response to stress. GAS consists of three sequential stages: alarm, resistance, and exhaustion. This model helps explain how chronic stress can contribute to health problems.
Alarm stage
In the alarm stage, the body's initial...
Global Regulatory Systems01:28

Global 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...
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...

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High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages
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Integrated stress responses in Salmonella.

Shu Shen1, Ferric C Fang

  • 1Departments of Laboratory Medicine and Microbiology, University of Washington School of Medicine, Seattle, WA, 98195-7242 USA.

International Journal of Food Microbiology
|May 17, 2011
PubMed
Summary

Salmonella adapts to diverse environments by coordinating gene expression. This review explores how multiple environmental signals integrate to regulate bacterial adaptation and survival pathways.

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Gene Regulation

Background:

  • Salmonella, a foodborne pathogen, faces diverse environmental challenges.
  • Survival requires adaptation to conditions in food, the gut, and host macrophages.
  • Adaptive responses involve coordinated gene expression regulated by environmental signals.

Purpose of the Study:

  • To review mechanisms integrating regulatory responses to multiple environmental signals in Salmonella.
  • To elucidate how Salmonella achieves adaptation through coordinated gene expression.

Main Methods:

  • Review of existing literature on Salmonella gene regulation.
  • Analysis of regulatory mechanisms responding to environmental signals like temperature, pH, and nutrient availability.
  • Examination of signal integration strategies.

Main Results:

  • Tandem promoters enable gene expression response to multiple signals.
  • Versatile sensor proteins can detect and respond to various environmental cues.
  • Transcriptional silencing (e.g., H-NS paradigm) integrates multiple regulatory inputs.
  • Signaling cascades allow independent sensory elements to activate gene expression.

Conclusions:

  • Salmonella employs sophisticated mechanisms to integrate diverse environmental signals.
  • These integrated regulatory responses facilitate adaptation to a wide range of conditions.
  • Understanding these pathways is crucial for controlling Salmonella pathogenesis.