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Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

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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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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...
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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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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 organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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Related Experiment Video

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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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Metabolite-responsive regulator RpiRB modulates Staphylococcus aureus pathogenicity via regulation of agr expression.

Shihui Yuan1, Ping Yan1, Huimin Su1

  • 1State Key Laboratory of Immune Response and Immunotherapy, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230027, China; Department of Oncology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China.

International Journal of Medical Microbiology : IJMM
|December 13, 2025
PubMed
Summary

The regulator RpiRB controls Staphylococcus aureus virulence by affecting agr-related factors and host inflammation. Disrupting rpiRB reduces pathogenicity in MRSA, offering insights into infection mechanisms.

Keywords:
HemolysisRpiRBStaphylococcus aureusVirulenceagr systemα-hemolysin

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Staphylococcus aureus is a significant human pathogen.
  • RpiRB's role in S. aureus virulence is largely uncharacterized.

Purpose of the Study:

  • Investigate the function of RpiRB in S. aureus pathogenicity.
  • Elucidate RpiRB's regulatory mechanisms in virulence and host response.

Main Methods:

  • Gene disruption of rpiRB in MRSA.
  • Transcriptional analysis of agr-related factors.
  • Hemolytic activity assays.
  • Mouse subcutaneous abscess model.
  • SarA inhibition studies.

Main Results:

  • rpiRB disruption down-regulates agr-related virulence factors and reduces hemolytic activity.
  • RpiRB influences host inflammatory response.
  • Deletion of rpiRB significantly attenuates S. aureus pathogenicity in vivo.
  • RpiRB enhances S. aureus virulence in an agr-dependent manner, inhibited by SarA.

Conclusions:

  • RpiRB is a key regulator of Staphylococcus aureus pathogenicity.
  • RpiRB modulates virulence through agr-dependent pathways and impacts host inflammation.
  • Targeting RpiRB may offer novel strategies against S. aureus infections.