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Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

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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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Bacterial Signaling01:30

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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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Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
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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.
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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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Inhibitors of Bacterial Protein Synthesis01:25

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Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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Related Experiment Video

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Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases
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Engineering nanoparticles to silence bacterial communication.

Kristen P Miller1, Lei Wang2, Yung-Pin Chen1

  • 1Microbial Interactions Laboratory, Department of Environmental Health Sciences, Public Health Research Center, Arnold School of Public Health, University of South Carolina Columbia, SC, USA.

Frontiers in Microbiology
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This summary is machine-generated.

Engineered nanoparticles disrupt bacterial communication by targeting quorum sensing signals. This novel approach reduces bacterial group behaviors, offering a promising alternative to traditional antibiotics and combating antimicrobial resistance.

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Area of Science:

  • Microbiology
  • Nanotechnology
  • Biochemistry

Background:

  • Bacterial resistance to antibiotics is a growing global health concern.
  • Quorum sensing (QS) is a critical bacterial communication system essential for infection establishment.
  • Targeting QS offers a novel strategy to combat bacterial infections and reduce resistance.

Purpose of the Study:

  • To engineer silicon dioxide nanoparticles (Si-NPs) to disrupt bacterial QS.
  • To investigate the efficacy of functionalized Si-NPs in inhibiting bacterial communication.
  • To explore Si-NPs as a scaffold for developing new antimicrobial therapies.

Main Methods:

  • Surface functionalization of Si-NPs with β-cyclodextrin (β-CD).
  • Treatment of *Vibrio fischeri* cultures with functionalized Si-NPs.
  • Measurement of luminescence reduction and analysis of luminescence genes via qPCR.
  • Investigation of acylhomoserine lactone (HSL) binding to Si-NPs using NMR spectroscopy.

Main Results:

  • Functionalized Si-NPs significantly reduced HSL-mediated QS in *Vibrio fischeri*.
  • Luminescence gene expression was downregulated, confirming reduced bacterial communication.
  • NMR spectroscopy confirmed the binding of HSLs to the engineered Si-NPs.
  • Si-NPs effectively removed QS signaling molecules from the bacterial environment.

Conclusions:

  • Engineered Si-NPs can effectively disrupt bacterial QS by sequestering signaling molecules.
  • This nanoparticle-based approach offers a promising strategy to inhibit bacterial communication and virulence.
  • Si-NPs represent a valuable platform for developing next-generation antimicrobials that circumvent traditional resistance mechanisms.