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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):...
The Antiviral System of Bacteria and Archaea: CRISPR01:23

The Antiviral System of Bacteria and Archaea: CRISPR

CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this defense.
CRISPR and crRNAs02:53

CRISPR and crRNAs

Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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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Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
10:41

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Published on: January 3, 2012

Toxin-antitoxin systems in bacteria and archaea.

Yoshihiro Yamaguchi1, Jung-Ho Park, Masayori Inouye

  • 1Department of Biochemistry, Center for Advanced Biotechnology and Medicine, Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, USA. yamaguyo@umdnj.edu

Annual Review of Genetics
|November 9, 2011
PubMed
Summary

Bacterial toxin-antitoxin (TA) systems regulate cell growth and survival. Understanding these TA systems is crucial for comprehending bacterial physiology and pathogenicity under stress.

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Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy
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Visualization of Bacterial Toxin Induced Responses Using Live Cell Fluorescence Microscopy

Published on: October 1, 2012

Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • Bacteria and archaea possess genes encoding toxins that inhibit growth and cause cell death upon overproduction.
  • These toxins target diverse cellular processes, including DNA replication, protein synthesis, and cell-wall biosynthesis.
  • Toxins are typically neutralized by cognate antitoxins within toxin-antitoxin (TA) operons during normal growth.

Purpose of the Study:

  • To investigate the role and regulation of bacterial toxin-antitoxin systems.
  • To understand the impact of TA systems on bacterial physiology, particularly under stress conditions.
  • To explore the involvement of TA systems in bacterial pathogenicity.

Main Methods:

  • Analysis of TA operon structure and gene expression.
  • Investigating toxin and antitoxin stability under various cellular conditions.
  • Comparative genomics to identify the prevalence of TA systems across different bacterial species.

Main Results:

  • Toxin-antitoxin systems are widespread, with numerous systems identified in bacteria like Escherichia coli and Mycobacterium tuberculosis.
  • Antitoxins are generally less stable than toxins and are degraded under stress, activating toxin-mediated growth inhibition.
  • The diverse targets and prevalence suggest significant roles in bacterial survival and pathogenesis.

Conclusions:

  • Toxin-antitoxin systems are integral to bacterial physiology, influencing growth, survival, and stress response.
  • The differential stability of toxins and antitoxins provides a regulatory mechanism for controlling cell fate.
  • Further elucidation of TA system function and regulation is essential for understanding bacterial pathogenicity and developing novel antimicrobial strategies.