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Methodologies for Studying B. subtilis Biofilms as a Model for Characterizing Small Molecule Biofilm Inhibitors
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Small-molecule inhibitors target Escherichia coli amyloid biogenesis and biofilm formation

Lynette Cegelski1, Jerome S Pinkner, Neal D Hammer

  • 1Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, USA.

Nature Chemical Biology
|November 17, 2009
PubMed

Insights

New compounds called curlicides, like FN075, effectively inhibit curli and type 1 pili assembly in uropathogenic Escherichia coli (UPEC). This dual action reduces biofilm formation and virulence in urinary tract infections.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Drug Discovery

Background:

  • Curli amyloid fibers and type 1 pili are crucial virulence factors for uropathogenic Escherichia coli (UPEC).
  • Biofilm formation mediated by these structures contributes significantly to persistent urinary tract infections (UTIs).

Purpose of the Study:

  • To investigate the efficacy of ring-fused 2-pyridones, specifically FN075 and BibC6, as inhibitors of curli biogenesis.
  • To evaluate the dual anti-biofilm and anti-virulence potential of these compounds against UPEC.

Main Methods:

  • In vitro assays to assess inhibition of CsgA polymerization and curli fiber formation.
  • Biofilm inhibition assays for both curli-dependent and type 1 pili-dependent biofilms.
  • In vivo mouse model of urinary tract infection to evaluate virulence attenuation.

Main Results:

  • FN075 and BibC6 effectively inhibited curli biogenesis and CsgA polymerization in UPEC.
  • These compounds, identified as curlicides, also retained pilicide activity, inhibiting type 1 pili assembly.
  • Dual inhibition resulted in significant reduction of both curli- and type 1 pili-dependent biofilms.
  • FN075 pretreatment markedly attenuated UPEC virulence in a mouse UTI model.

Conclusions:

  • Ring-fused 2-pyridones like FN075 possess dual activity against curli and type 1 pili.
  • These compounds demonstrate significant potential as novel anti-biofilm and anti-virulence agents for treating UPEC infections.
  • Targeting both curli and type 1 pili represents a promising strategy for combating UTIs.

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