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Related Concept Videos

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):...
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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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Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
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Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
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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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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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Related Experiment Video

Updated: May 14, 2026

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus
08:32

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

Published on: January 17, 2025

Essential Staphylococcus aureus toxin export system.

Som S Chatterjee1, Hwang-Soo Joo, Anthony C Duong

  • 1Pathogen Molecular Genetics Section, Laboratory of Human Bacterial Pathogenesis, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA.

Nature Medicine
|February 12, 2013
PubMed
Summary
This summary is machine-generated.

A newly discovered transporter exports all phenol-soluble modulins (PSMs), crucial toxins in Staphylococcus aureus infections. Targeting this single transporter could inhibit both bacterial growth and virulence, offering a novel therapeutic strategy.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Drug Discovery

Background:

  • Antibiotic resistance in Staphylococcus aureus necessitates novel therapeutic strategies.
  • Phenol-soluble modulins (PSMs) are key virulence factors contributing to S. aureus pathogenesis.
  • The diversity and abundance of PSMs present a challenge for therapeutic targeting.

Purpose of the Study:

  • To identify a common mechanism for the export of all PSMs.
  • To evaluate a potential single-target therapeutic strategy against S. aureus virulence and growth.

Main Methods:

  • Functional characterization of a novel ATP-binding cassette transporter.
  • Assessment of the transporter's role in PSM export.
  • Evaluation of the transporter's impact on S. aureus virulence phenotypes and bacterial growth.

Main Results:

  • A previously uncharacterized ATP-binding cassette transporter was identified as essential for the export of all PSMs.
  • This transporter significantly impacts virulence phenotypes, including neutrophil lysis.
  • The transporter is crucial for bacterial growth, producer immunity, and defense against bacterial interference.

Conclusions:

  • A noncanonical, dedicated secretion system for PSMs has been revealed.
  • The identified transporter represents a promising single target for developing drugs to combat S. aureus infections.
  • Inhibiting this transporter could simultaneously reduce S. aureus virulence and bacterial growth.