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Related Concept Videos

Types of RNA01:23

Types of RNA

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Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
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Translational Regulation01:29

Translational Regulation

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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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Stringent Response in E. coli01:23

Stringent Response in E. coli

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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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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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Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

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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 RNA Polymerase00:43

Bacterial RNA Polymerase

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Related Experiment Video

Updated: Aug 20, 2025

A Non-Coding Small RNA MicC Contributes to Virulence in Outer Membrane Proteins in Salmonella Enteritidis
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The RNA-Binding Protein ProQ Promotes Antibiotic Persistence in Salmonella.

Alisa Rizvanovic1, Charlotte Michaux2,3, Margherita Panza1

  • 1Department of Cell and Molecular Biology, Biomedical Centre, Uppsala Universitygrid.8993.b, Uppsala, Sweden.

Mbio
|November 21, 2022
PubMed
Summary

The RNA-binding protein ProQ promotes antibiotic persistence in Salmonella by activating costly cellular processes. This ProQ-dependent survival mechanism is crucial for Salmonella pathogenesis during macrophage infection.

Keywords:
ProQRNA-binding proteinSalmonellaantibiotic persistenceantibiotic persistersflagellaflagellar gene regulationpersister formation

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Antibiotic persistence is a key challenge in treating bacterial infections, involving a small subpopulation of dormant cells.
  • The RNA-binding protein ProQ is a recently identified global regulator of gene expression in bacteria.
  • Understanding persister formation mechanisms is critical for developing effective antimicrobial strategies.

Purpose of the Study:

  • To investigate the role of the RNA-binding protein ProQ in antibiotic persister formation in Salmonella.
  • To elucidate the molecular mechanisms underlying ProQ-mediated persister development.
  • To assess the significance of ProQ-dependent persistence in the context of host-pathogen interactions.

Main Methods:

  • Phenotypic analysis of persister formation in wild-type and proQ mutant Salmonella strains.
  • Assessment of bacterial survival under antibiotic stress in vitro.
  • Investigation of gene expression and metabolic pathway activation using molecular techniques.
  • Macrophage infection models to evaluate ProQ's role during host-pathogen interactions.

Main Results:

  • ProQ significantly impacts persister formation in Salmonella, contributing to growth arrest and survival under antibiotic treatment.
  • ProQ-dependent persister formation involves the activation of energy-intensive pathways, including flagellar motility and type III secretion systems.
  • The ProQ-mediated persistence phenotype is relevant during Salmonella infection of macrophages, enhancing survival against host defenses and antibiotics.
  • proQ mutants exhibit reduced persister formation and are outcompeted by wild-type bacteria under certain laboratory conditions.

Conclusions:

  • ProQ is a critical regulator promoting antibiotic persistence in Salmonella.
  • Activation of costly cellular processes by ProQ is a key mechanism for persister formation.
  • ProQ plays a significant role in Salmonella pathogenesis by enabling survival during host infection and antibiotic exposure.