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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...
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):...
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...
Types of Toxins01:36

Types of Toxins

Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
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
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Diphtheria01:28

Diphtheria

Diphtheria is an acute, toxin-mediated infectious disease that primarily affects the upper respiratory tract. It is caused by Corynebacterium diphtheriae, a Gram-positive, pleomorphic rod that lacks spore-forming capability and exhibits a characteristic club-shaped morphology under microscopic examination. While C. diphtheriae can asymptomatically colonize mucosal surfaces, clinical disease manifests only when the bacterial strain is lysogenized by a specific β-corynephage. This phage...

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Updated: May 17, 2026

Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
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Published on: January 3, 2012

Type I toxin-antitoxin systems in Bacillus subtilis.

Sylvain Durand1, Natalie Jahn, Ciarán Condon

  • 1CNRS UPR 9073 (affiliated with Univ. Paris Diderot, Sorbonne Paris Cité), Institut de Biologie Physico-Chimique, Paris, France.

RNA Biology
|October 13, 2012
PubMed
Summary

Type I toxin-antitoxin (TA) systems use antisense RNA to regulate toxin expression in bacteria like Bacillus subtilis. This review covers known TA families, their mechanisms, and roles in cell physiology.

Keywords:
RNA degradationantisense RNAantitoxinspost-segregational killingprophagetoxins

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Last Updated: May 17, 2026

Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
10:41

Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance

Published on: January 3, 2012

Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy
14:29

Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy

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08:51

Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling

Published on: June 25, 2015

Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • Type I toxin-antitoxin (TA) systems are prevalent genetic elements in bacteria.
  • These systems comprise a toxin-encoding mRNA and a complementary antisense RNA that regulates toxin production.
  • Regulation occurs via translational repression or mRNA destabilization.

Purpose of the Study:

  • To review confirmed and putative type I TA systems in Bacillus subtilis.
  • To elucidate the regulatory mechanisms of these TA systems.
  • To explore the potential physiological roles of TA systems in B. subtilis.

Main Methods:

  • Literature review of existing studies on type I TA systems in B. subtilis.
  • Analysis of sequence similarities to identify toxin families.
  • Examination of regulatory mechanisms and cellular functions.

Main Results:

  • Four type I TA families (TxpA/BsrG, BsrH/BsrE, YonT, YhzE) are proposed in B. subtilis.
  • Two families, TxpA and BsrG, have been investigated in greater detail.
  • The review synthesizes current knowledge on their operation and potential links to cell physiology.

Conclusions:

  • Type I TA systems in B. subtilis exhibit diverse regulatory strategies.
  • Understanding these systems is crucial for deciphering bacterial physiology and gene regulation.
  • Further research is needed to fully characterize all identified TA families and their functions.