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Area of Science:

  • Microbiology
  • Molecular Biology
  • Pathogenesis

Background:

  • Clostridium difficile causes antibiotic-associated diarrhea, with limited understanding of its colonization mechanisms beyond toxins.
  • The C. difficile S-layer, composed of SlpA and homologues like CwpV, is crucial for cell surface structure.
  • CwpV is a large cell wall protein family member, expressed in a phase-variable manner.

Purpose of the Study:

  • To investigate the role of CwpV in Clostridium difficile colonization and pathogenesis.
  • To elucidate the structural and regulatory mechanisms of CwpV function and variation.

Main Methods:

  • Analysis of CwpV function in bacterial aggregation.
  • Identification and characterization of CwpV repeat types and their antigenic properties.
  • Gene knock-out studies to determine the role of RecV in CwpV phase variation.
  • Investigation of CwpV post-translational modification and cell surface anchoring.

Main Results:

  • CwpV promotes Clostridium difficile aggregation through its C-terminal repetitive domain.
  • Five distinct, antigenically different repeat types were identified in the C-terminal domain.
  • CwpV expression is phase-variable, regulated by the site-specific recombinase RecV.
  • CwpV undergoes conserved post-translational cleavage, with a conserved N-terminus anchoring it to the cell surface.

Conclusions:

  • CwpV plays a significant role in Clostridium difficile colonization by promoting aggregation.
  • Conserved regulatory and processing mechanisms contrast with the strain-variable functional domain of CwpV.
  • The distinct antigenic forms of CwpV suggest a complex evolutionary history and potential for immune evasion.