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Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene 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,...
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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...
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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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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...
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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...

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In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination
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SUMOylation and bacterial pathogens.

David Ribet1, Pascale Cossart

  • 1Unité des Interactions Bactéries-Cellules, Département de Biologie Cellulaire et Infection, Institut Pasteur, Paris, France.

Virulence
|December 24, 2010
PubMed
Summary
This summary is machine-generated.

Bacterial pathogens manipulate host cell post-translational modifications, including SUMOylation, to aid their survival and replication during infection. This targeted interference controls host factors crucial for the infection process.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Cell Biology

Background:

  • Bacterial pathogens extensively modify host cell processes for survival.
  • Post-translational modifications (PTMs) are key targets for pathogen manipulation.
  • While phosphorylation and ubiquitylation are well-studied, SUMOylation is a newly recognized target.

Purpose of the Study:

  • To investigate the role of SUMOylation in bacterial infections.
  • To understand how bacterial pathogens target and modulate host SUMOylation.
  • To explore the impact of SUMOylation interference on host factors and infection outcomes.

Main Methods:

  • Analysis of host-pathogen interactions at the molecular level.
  • Investigating changes in host cell SUMOylation patterns during infection.
  • Identifying specific bacterial factors involved in SUMOylation modulation.

Main Results:

  • Pathogenic bacteria actively interfere with host cell SUMOylation.
  • This interference influences the function and fate of critical host factors.
  • SUMOylation modulation by bacteria is a significant mechanism for promoting pathogen survival and replication.

Conclusions:

  • Targeting host SUMOylation is a critical strategy employed by bacterial pathogens.
  • Understanding SUMOylation interference offers new insights into infection pathogenesis.
  • Modulation of SUMOylation presents potential targets for therapeutic interventions against bacterial infections.