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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...
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Defense Against Bacterial Pathogens

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Phagocytes
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Drug toxicity: Drug–Drug Interaction

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Bacterial Phylum Actinobacteria

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Related Experiment Video

Updated: Jun 8, 2026

Preparation of Mycobacterium tuberculosis Culture Filtrate to Understand TB Pathogenesis
07:32

Preparation of Mycobacterium tuberculosis Culture Filtrate to Understand TB Pathogenesis

Published on: March 28, 2025

Noncognate Mycobacterium tuberculosis toxin-antitoxins can physically and functionally interact.

Ling Zhu1, Jared D Sharp, Hiroshi Kobayashi

  • 1Department of Biochemistry, Robert Wood Johnson Medical School, Piscataway, New Jersey 08854-5635, USA.

The Journal of Biological Chemistry
|September 30, 2010
PubMed
Summary

Mycobacterium tuberculosis possesses numerous toxin-antitoxin systems. Surprisingly, these systems show non-cognate interactions, challenging the "one toxin for one antitoxin" model and suggesting a complex regulatory network.

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Last Updated: Jun 8, 2026

Preparation of Mycobacterium tuberculosis Culture Filtrate to Understand TB Pathogenesis
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Published on: August 16, 2021

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • The Mycobacterium tuberculosis (Mtb) genome contains over 40 toxin-antitoxin (TA) systems.
  • At least seven MazF orthologs exist in Mtb, with four functioning as mRNA interferases targeting specific cleavage sites.
  • TA systems typically consist of a toxin gene downstream of its cognate antitoxin gene.

Purpose of the Study:

  • To investigate the interactions between Mtb toxin and antitoxin pairs.
  • To determine if Mtb TA systems adhere to the canonical "one toxin for one antitoxin" principle.
  • To explore the potential for non-cognate interactions within and between different TA families in Mtb.

Main Methods:

  • In vivo toxicity and rescue experiments were performed.
  • In vitro interaction assays were utilized.
  • A wide range of cognate and non-cognate Mtb toxin-antitoxin pair combinations were tested.

Main Results:

  • Only one Mtb MazE antitoxin showed significant similarity to E. coli MazE.
  • Two Mtb MazE orthologs were found paired with PIN domain-containing proteins, suggesting VapBC family membership.
  • Several instances of non-cognate toxin-antitoxin associations were discovered, including between MazF toxins and VapB antitoxins.

Conclusions:

  • Mtb toxin-antitoxin systems do not strictly follow the "one toxin for one antitoxin" rule.
  • Non-cognate interactions occur between different TA families in Mtb.
  • Mtb likely employs a complex TA network for physiological regulation in response to environmental changes.