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Related Experiment Video

Updated: Jul 5, 2026

A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment

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Published on: May 25, 2017

Processing of Clostridium difficile toxins.

Torsten Giesemann¹, Martina Egerer¹, Thomas Jank¹

¹Institut für Experimentelle und Klinische Pharmakologie und Toxikologie, Universität Freiburg, Albertstrasse 25, D-79104 Freiburg, Germany.

Journal of Medical Microbiology

|May 16, 2008

Summary

Clostridium difficile toxins A and B (TcdA and TcdB) cause disease by entering cells. This study reviews how their catalytic domains are processed for cell entry and function.

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Last Updated: Jul 5, 2026

A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment

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Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

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Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment

Published on: September 14, 2013

Area of Science:

Microbiology
Molecular Biology
Cellular Biology

Background:

Clostridium difficile pathogenicity is mediated by glucosylating toxins TcdA and TcdB.
These toxins possess modular structures with distinct catalytic and binding/translocation domains.
Toxin uptake involves proteolytic processing, delivering the catalytic domain to the host cell cytosol.

Purpose of the Study:

To provide an overview of recent findings on the intramolecular processing of Clostridium difficile toxins.
To highlight the role of intrinsic protease activity in toxin activation.

Main Methods:

Review of existing literature on Clostridium difficile toxin structure and function.
Analysis of studies investigating toxin processing and translocation mechanisms.

Main Results:

The catalytic domain of TcdA and TcdB is released via intramolecular proteolytic cleavage.
This processing is essential for the toxins to reach the cytosol and exert their enzymatic activity.
Glucosyltransferases inactivate host cell small GTPases through mono-O-glucosylation.

Conclusions:

Understanding the intramolecular processing of Clostridium difficile toxins is crucial for comprehending their pathogenicity.
The intrinsic protease activity plays a key role in delivering the active toxin domain into host cells.
Targeting this processing mechanism could offer novel therapeutic strategies against C. difficile infections.