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Related Concept Videos

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...
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,...
Determinants of Bacterial Pathogenicity and Virulence01:20

Determinants of Bacterial Pathogenicity and Virulence

Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
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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...
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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...
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...

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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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Published on: February 19, 2019

LiaS regulates virulence factor expression in Streptococcus mutans.

Patrick Chong1, Laura Drake, Indranil Biswas

  • 1Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, Kansas 66160, USA.

Infection and Immunity
|May 7, 2008
PubMed
Summary
This summary is machine-generated.

The LiaS sensor kinase negatively regulates GbpC, crucial for biofilm formation in Streptococcus mutans. LiaS also positively regulates mutacin IV production, indicating a complex role in virulence.

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Last Updated: Jul 5, 2026

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
07:10

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Published on: February 19, 2019

A Semi-quantitative Approach to Assess Biofilm Formation Using Wrinkled Colony Development
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A Tandem Liquid Chromatography&#8211;Mass Spectrometry-based Approach for Metabolite Analysis of Staphylococcus aureus
08:03

A Tandem Liquid Chromatography–Mass Spectrometry-based Approach for Metabolite Analysis of Staphylococcus aureus

Published on: March 28, 2017

Area of Science:

  • Microbiology
  • Molecular Biology
  • Oral Health

Background:

  • Streptococcus mutans is a primary cause of dental caries.
  • Virulence factors include biofilm formation, acid tolerance, and mutacin production.
  • GbpC protein facilitates biofilm formation by binding glucan.

Purpose of the Study:

  • Investigate environmental cues inducing GbpC production.
  • Determine the role of sensor kinases in gbpC gene expression.
  • Elucidate the regulatory network of virulence factors in S. mutans.

Main Methods:

  • Examined 14 sensor kinases for their effect on gbpC expression in S. mutans UA159.
  • Utilized reverse transcription-PCR to analyze gene expression.
  • Inactivated LiaS and LiaR to assess their regulatory roles.

Main Results:

  • LiaS was identified as the sole sensor kinase regulating gbpC expression.
  • LiaS negatively controls gbpC expression, while LiaR shows no significant effect.
  • LiaS positively regulates mutacin IV production by affecting nlmA and nlmT expression.

Conclusions:

  • LiaS plays a dual role in regulating S. mutans virulence.
  • A potential cross-talk mechanism between LiaS and other response regulators is suggested.
  • Understanding this regulatory network could inform strategies against dental caries.