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Related Concept Videos

Bacterial Signaling01:30

Bacterial Signaling

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...
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,...
Biofilms01:29

Biofilms

Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
Global Regulatory Systems01:28

Global Regulatory Systems

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...
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...

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Related Experiment Video

Updated: Jun 15, 2026

Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases
07:47

Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases

Published on: January 1, 2016

Quorum sensing and bacterial biofilms.

Jeroen S Dickschat1

  • 1Institute of Organic Chemistry, Technical University of Braunschweig, Hagenring 30, Braunschweig, Germany. j.dickschat@tu-bs.de

Natural Product Reports
|February 25, 2010
PubMed
Summary

This review details bacterial biofilm chemistry, focusing on N-acyl-L-homoserine lactones (AHLs) as key signaling molecules. It summarizes AHL autoinducers and their role in biofilm formation and inhibition.

Area of Science:

  • Microbiology
  • Biochemistry
  • Chemical Biology

Background:

  • Bacterial biofilms are complex communities crucial in various environments.
  • Biofilm formation is regulated by chemical signaling molecules, particularly quorum sensing autoinducers.
  • N-acyl-L-homoserine lactones (AHLs) are a major class of autoinducers in Gram-negative bacteria.

Purpose of the Study:

  • To review the chemistry of bacterial biofilms and their constituent signaling compounds.
  • To focus on N-acyl-L-homoserine lactones (AHLs) as key mediators of biofilm formation.
  • To summarize known AHL autoinducers, producing species, and mechanisms of biofilm inhibition.

Main Methods:

  • Literature review of scientific publications on bacterial biofilms and quorum sensing.

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  • Compilation and summary of identified N-acyl-L-homoserine lactone (AHL) structures and producing bacterial species.
  • Discussion of systems where biofilm formation is inhibited by AHL degradation or secondary metabolites.

    • Main Results:

    • A comprehensive summary of known AHL autoinducers and the bacterial species that produce them.
    • Identification of various AHL structures and their prevalence in Gram-negative bacteria.
    • Examples of biofilm inhibition through enzymatic degradation of AHLs or interference with quorum sensing.

    Conclusions:

    • N-acyl-L-homoserine lactones (AHLs) are central to the quorum sensing systems regulating bacterial biofilm formation.
    • Understanding AHL chemistry provides insights into controlling biofilm development.
    • The Vibrio genus serves as a model for studying complex, multi-channel quorum sensing systems in biofilm formation.