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Related Concept Videos

Regulation of Bacterial Virulence01:28

Regulation 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...
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...
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...
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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...

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Related Experiment Video

Updated: May 16, 2026

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages
11:10

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

Published on: August 11, 2014

A Rab32-dependent pathway contributes to Salmonella typhi host restriction.

Stefania Spanò1, Jorge E Galán

  • 1Department of Microbial Pathogenesis, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA.

Science (New York, N.Y.)
|November 20, 2012
PubMed
Summary

Salmonella Typhi

Area of Science:

  • Microbiology
  • Pathogen Host Specificity
  • Bacterial Pathogenesis

Background:

  • Salmonella Typhi is a human pathogen with strict host specificity.
  • The molecular mechanisms underlying this host restriction are not well understood.

Purpose of the Study:

  • To investigate the molecular basis of Salmonella Typhi's host specificity.
  • To identify bacterial factors enabling survival in non-permissive hosts.

Main Methods:

  • Investigated the role of a Salmonella Typhimurium type III secretion system effector protein.
  • Utilized RNA interference to deplete host factors Rab32 and BLOC components.
  • Examined Salmonella Typhi survival in mouse macrophages and tissues.

Main Results:

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Identification of Host Pathways Targeted by Bacterial Effector Proteins using Yeast Toxicity and Suppressor Screens
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Quantification of Cytosolic vs. Vacuolar Salmonella in Primary Macrophages by Differential Permeabilization
09:25

Quantification of Cytosolic vs. Vacuolar Salmonella in Primary Macrophages by Differential Permeabilization

Published on: July 28, 2015

Related Experiment Videos

Last Updated: May 16, 2026

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages
11:10

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

Published on: August 11, 2014

Identification of Host Pathways Targeted by Bacterial Effector Proteins using Yeast Toxicity and Suppressor Screens
07:40

Identification of Host Pathways Targeted by Bacterial Effector Proteins using Yeast Toxicity and Suppressor Screens

Published on: October 25, 2019

Quantification of Cytosolic vs. Vacuolar Salmonella in Primary Macrophages by Differential Permeabilization
09:25

Quantification of Cytosolic vs. Vacuolar Salmonella in Primary Macrophages by Differential Permeabilization

Published on: July 28, 2015

  • A single type III secretion system effector from Salmonella Typhimurium enabled Salmonella Typhi to survive and replicate in mice.
  • This effector targets Rab32, a protein involved in lysosome-related organelle traffic.
  • Depletion of Rab32 or BLOC components allowed Salmonella Typhi survival in mouse macrophages.

Conclusions:

  • A Salmonella Typhimurium effector protein can overcome Salmonella Typhi's host specificity.
  • Rab32 and BLOC complexes are key host factors restricting Salmonella Typhi infection.
  • Targeting host cellular machinery is a mechanism for bacterial host adaptation.