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Related Concept Videos

Bacterial Toxins01:12

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
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,...
Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...

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Updated: May 12, 2026

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

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

Published on: February 19, 2019

Staphylococcus aureus toxins--their functions and genetics.

Dorothee Grumann1, Ulrich Nübel2, Barbara M Bröker1

  • 1Institute of Immunology and Transfusion Medicine, University of Greifswald, 17487 Greifswald, Germany.

Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases
|April 2, 2013
PubMed
Summary

Staphylococcus aureus toxins, encoded on mobile genetic elements, vary significantly between strains. Their distribution within bacterial lineages complicates understanding toxin-specific disease contributions.

Keywords:
EpidemiologyEvolutionExfoliative toxinsPore-forming toxinsS. aureusSuperantigens

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A Tandem Liquid Chromatography&#8211;Mass Spectrometry-based Approach for Metabolite Analysis of Staphylococcus aureus
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A Tandem Liquid Chromatography–Mass Spectrometry-based Approach for Metabolite Analysis of Staphylococcus aureus

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Last Updated: May 12, 2026

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

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

Published on: February 19, 2019

Quantifying the Cytotoxicity of Staphylococcus aureus Against Human Polymorphonuclear Leukocytes
12:27

Quantifying the Cytotoxicity of Staphylococcus aureus Against Human Polymorphonuclear Leukocytes

Published on: January 3, 2020

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
  • Genomics
  • Pathogenesis

Background:

  • Staphylococcus aureus (S. aureus) interactions with humans range from colonization to severe infections.
  • S. aureus possesses a pan-genome encoding numerous toxins implicated in various diseases and symptoms.
  • Toxin-encoding genes are frequently located on mobile genetic elements (MGEs), leading to strain-specific toxin profiles.

Purpose of the Study:

  • To review key Staphylococcus aureus toxin families: pore-forming toxins, exfoliative toxins, and superantigens.
  • To explore the impact of mobile genetic elements (MGEs) on toxin gene distribution within S. aureus populations.
  • To analyze how population genomics aids in understanding MGE and toxin gene mobility.

Main Methods:

  • Review of literature on Staphylococcus aureus toxins and mobile genetic elements.
  • Analysis of population genomic data to understand toxin gene distribution.
  • Phylogenetic analysis of clonal lineages and their associated toxin signatures.

Main Results:

  • The majority of S. aureus toxin genes reside on MGEs, causing significant strain heterogeneity.
  • Population genomic analyses reveal patterns in MGE and toxin gene movement.
  • Specific phylogenetic lineages of S. aureus exhibit characteristic toxin gene profiles.
  • Toxin gene distribution is non-random and linked to bacterial clonal lineages.

Conclusions:

  • The clonal nature of S. aureus and lineage-specific toxin signatures complicate the attribution of disease effects to individual toxins.
  • Understanding the interplay between genetic background and toxin expression is crucial for deciphering S. aureus pathogenesis.
  • Further research integrating population genomics and toxin analysis is needed to fully elucidate S. aureus virulence.