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Related Concept Videos

Bacterial Toxins01:12

Bacterial Toxins

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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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RNA Structure01:19

RNA Structure

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
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RNA Structure01:23

RNA Structure

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Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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Diphtheria01:28

Diphtheria

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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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GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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ATP Synthase: Structure01:18

ATP Synthase: Structure

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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
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Novel bacterial ADP-ribosylating toxins: structure and function.

Nathan C Simon1, Klaus Aktories2, Joseph T Barbieri1

  • 1Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA.

Nature Reviews. Microbiology
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New bacterial ADP-ribosyltransferase toxins (bARTTs) from various pathogens ADP-ribosylate novel substrates. These toxins possess unique structures and functions, expanding our understanding of bacterial pathogenesis and bARTT diversity.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacterial ADP-ribosyltransferase toxins (bARTTs) are crucial virulence factors.
  • They modify eukaryotic proteins, impacting host cell function and promoting infection.
  • Established toxins like diphtheria and pertussis toxins serve as benchmarks.

Purpose of the Study:

  • To review and characterize newly identified bARTTs.
  • To explore their novel substrates, unique organizations, and pathogenic roles.
  • To expand the understanding of bARTT diversity and function.

Main Methods:

  • Bioinformatic analyses for novel bARTT identification.
  • Biochemical characterization of toxin activity.
  • Structural analysis of toxin organization.

Main Results:

  • Several new bARTTs were identified from human, insect, and plant pathogens.
  • Toxins such as cholix toxin (ChxA), SpyA, HopU1, and Tcc toxins exhibit novel substrate modification.
  • These toxins display unique structural features distinct from reference bARTTs.

Conclusions:

  • The newly characterized bARTTs significantly broaden the known repertoire of these toxins.
  • Their unique properties highlight diverse mechanisms of bacterial pathogenesis.
  • Further research into these toxins will deepen our understanding of host-pathogen interactions.