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Clostridium difficile TcdC protein binds four-stranded G-quadruplex structures.

Hans C van Leeuwen1, Dennis Bakker, Philip Steindel

  • 1Department of Medical Microbiology, Center of Infectious Diseases, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, The Netherlands. J.Corver@LUMC.nl

Nucleic Acids Research
|January 11, 2013
PubMed
Summary
This summary is machine-generated.

Clostridium difficile TcdC protein, previously thought to be an anti-sigma factor, binds to G-quadruplex DNA structures. This finding suggests a novel DNA-binding function for TcdC, impacting our understanding of C. difficile virulence regulation.

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Production, Crystallization and Structure Determination of C. difficile PPEP-1 via Microseeding and Zinc-SAD

Published on: December 30, 2016

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Clostridium difficile infections are a growing global health concern, driven by increasingly virulent strains.
  • The primary C. difficile toxins, TcdA and TcdB, are key virulence factors, with their transcription regulated by TcdR and potentially TcdC.
  • TcdC is hypothesized to function as an anti-sigma factor, negatively regulating toxin gene transcription.

Purpose of the Study:

  • To elucidate the biochemical properties and mechanism of action of the Clostridium difficile TcdC protein.
  • To investigate the potential DNA-binding capabilities of TcdC and its functional domains.

Main Methods:

  • Bioinformatic analysis of the TcdC protein sequence to predict functional domains.
  • Gel filtration chromatography to assess TcdC dimerization.
  • Single-stranded Systematic Evolution of Ligands by Exponential enrichment (SELEX) coupled with electrophoretic-mobility shift assay (EMSA) to study DNA binding.

Main Results:

  • Bioinformatic analysis predicted a dimerization domain (aa 90-130) and an oligonucleotide-binding (OB) fold in TcdC.
  • Gel filtration confirmed that the aa 90-130 domain is crucial for TcdC dimerization.
  • SELEX and EMSA demonstrated that the TcdC OB fold specifically binds to G-quadruplex DNA structures.

Conclusions:

  • The Clostridium difficile TcdC protein exhibits specific DNA-binding activity, particularly to G-quadruplex structures.
  • This DNA-binding capability suggests a functional role for TcdC beyond its proposed anti-sigma factor activity.
  • Further research into TcdC's DNA interactions may reveal new mechanisms of C. difficile virulence regulation.