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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...
Bacterial Gastroenteritis01:18

Bacterial Gastroenteritis

Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
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...
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...
Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
Receptor-mediated Endocytosis01:20

Receptor-mediated Endocytosis

Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...

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Related Experiment Video

Updated: May 27, 2026

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
09:25

Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells

Published on: August 19, 2016

Staphylococcal enterotoxins.

Irina V Pinchuk1, Ellen J Beswick, Victor E Reyes

  • 1Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555-0655, USA. ivpinchu@utmb.edu

Toxins
|November 10, 2011
PubMed
Summary

Staphylococcus aureus exotoxins, like SEA and SEB, cause food poisoning and toxic shock by activating T cells. Antibiotic-resistant strains are a growing clinical concern.

Keywords:
Staphylococcus aureusclass II MHCenterotoxinsfood-borne poisoningsuperantigens

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Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy
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Identification of Antibacterial Immunity Proteins in Escherichia coli using MALDI-TOF-TOF-MS/MS and Top-Down Proteomic Analysis
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Identification of Antibacterial Immunity Proteins in Escherichia coli using MALDI-TOF-TOF-MS/MS and Top-Down Proteomic Analysis

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Related Experiment Videos

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Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
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Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells

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Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy
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Identification of Antibacterial Immunity Proteins in Escherichia coli using MALDI-TOF-TOF-MS/MS and Top-Down Proteomic Analysis
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Identification of Antibacterial Immunity Proteins in Escherichia coli using MALDI-TOF-TOF-MS/MS and Top-Down Proteomic Analysis

Published on: May 23, 2021

Area of Science:

  • Microbiology
  • Immunology
  • Toxicology

Background:

  • Staphylococcus aureus is a common Gram-positive bacterium carried by one-third of the population.
  • S. aureus causes diseases like food poisoning and toxic shock syndrome via exotoxins.
  • Staphylococcal enterotoxins (SEs), particularly SEA and SEB, are potent superantigens.

Purpose of the Study:

  • To provide an overview of the current understanding of S. aureus exotoxins.
  • To highlight the role of SEA and SEB as superantigens.
  • To discuss the clinical significance of multi-drug resistant S. aureus strains.

Main Methods:

  • Review of existing literature on S. aureus exotoxins.
  • Analysis of the superantigenic properties of SEA and SEB.
  • Discussion of the implications of antibiotic resistance in S. aureus.

Main Results:

  • SEA and SEB bind to MHC class II molecules on antigen-presenting cells.
  • These toxins stimulate T cells, leading to a cytokine storm and toxic shock.
  • SEs are resistant to denaturation, contributing to foodborne outbreaks.
  • Multi-drug resistant S. aureus is a significant cause of hospital-acquired infections.

Conclusions:

  • S. aureus exotoxins are critical virulence factors responsible for significant human diseases.
  • The superantigenic activity of SEA and SEB underlies their role in toxic shock syndrome.
  • Antibiotic resistance in S. aureus poses a major challenge in clinical settings.