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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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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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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...
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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.
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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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Escherichia coli toxin/antitoxin pair MqsR/MqsA regulate toxin CspD.

Younghoon Kim1, Xiaoxue Wang, Xue-Song Zhang

  • 1Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA.

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|January 29, 2010
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Summary

The MqsR/MqsA toxin/antitoxin system in Escherichia coli regulates additional genes, including the toxin CspD, impacting cell physiology beyond its own toxicity.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • Escherichia coli MqsR (YgiU) is a known toxin involved in quorum sensing, biofilm formation, and persister cell development.
  • Toxin/antitoxin (TA) systems are typically involved in regulating their own expression and stability.
  • MqsR has been identified as an RNase, suggesting a mechanism for its toxic activity.

Purpose of the Study:

  • To elucidate the complete function of the MqsR/MqsA toxin/antitoxin pair in Escherichia coli.
  • To identify additional genes and pathways regulated by the MqsR/MqsA system.
  • To understand the regulatory mechanism of MqsR toxicity beyond its RNase activity.

Main Methods:

  • Whole-transcriptome studies (three sets) and nickel-enrichment DNA binding microarrays (two sets).
  • Cell survival studies involving MqsR overproduction in isogenic mutants.
  • Quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR) and electrophoretic mobility shift assays (EMSA).

Main Results:

  • MqsR and MqsA form a toxin/antitoxin pair that regulates additional genes, unlike other known TA pairs.
  • Eight genes, including the toxin CspD, were identified as involved in MqsR toxicity.
  • The MqsR/MqsA complex represses CspD expression, which can be derepressed by MqsR titration of MqsA or MqsA degradation via stress-activated proteases Lon and ClpXP.

Conclusions:

  • The MqsR/MqsA TA system exhibits unique regulatory functions by controlling other genetic loci, including the toxin CspD.
  • MqsR toxicity involves mechanisms beyond its RNase activity, interacting with other cellular components and pathways.
  • This TA system plays a significant role in controlling bacterial cell physiology through dual toxicity and regulatory mechanisms.