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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...
Types of RNA01:23

Types of RNA

Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Ribozymes02:47

Ribozymes

The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
Ribozymes can be...
Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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...

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Related Experiment Video

Updated: May 13, 2026

Overexpressing and Purifying a Toxic Nuclease from Escherichia coli
08:13

Overexpressing and Purifying a Toxic Nuclease from Escherichia coli

Published on: August 29, 2025

Ribonucleases in bacterial toxin-antitoxin systems.

Gregory M Cook1, Jennifer R Robson, Rebekah A Frampton

  • 1Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand. gregory.cook@otago.ac.nz

Biochimica Et Biophysica Acta
|March 5, 2013
PubMed
Summary

Toxin-antitoxin systems use RNA-targeting toxins to regulate bacterial processes. Further research is needed to understand toxin release triggers and precise cellular functions in diverse bacteria.

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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

Related Experiment Videos

Last Updated: May 13, 2026

Overexpressing and Purifying a Toxic Nuclease from Escherichia coli
08:13

Overexpressing and Purifying a Toxic Nuclease from Escherichia coli

Published on: August 29, 2025

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

Area of Science:

  • Bacteriology
  • Molecular Biology
  • Genetics

Background:

  • Toxin-antitoxin (TA) systems are crucial for bacterial and archaeal cellular activities.
  • TA toxins primarily target mRNA, inhibiting translation via RNA cleavage.
  • Ribosome-independent RNA interferases, like MazF and VapC, exhibit diverse cleavage specificities and cellular roles.

Purpose of the Study:

  • To review the mechanisms and functions of RNA-targeting toxins within TA systems.
  • To highlight the roles of MazF, VapC, and ToxN families in bacterial regulation and stress response.
  • To identify knowledge gaps concerning environmental triggers and precise functions of TA systems.

Main Methods:

  • Comparative analysis of toxin structures and functions.
  • Review of literature on RNA interferases and their targets.
  • Examination of TA system roles in programmed cell death, growth, and stress adaptation.

Main Results:

  • MazF family toxins cleave mRNA at specific sequences, influencing cell death and stress responses.
  • VapC endoribonucleases target tRNA or mRNA, impacting bacterial growth and adaptation.
  • ToxN, homologous to MazF, confers phage resistance by cleaving RNA.

Conclusions:

  • RNA-targeting toxins are diverse and play significant roles in bacterial physiology and defense.
  • Understanding environmental triggers for TA toxin activity remains a key challenge.
  • Further investigation into TA systems is essential for elucidating their full cellular functions.