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Micro-CT X-ray imaging exposes structured diffusion barriers within biofilms.

Alona Keren-Paz1, Vlad Brumfeld2, Yaara Oppenheimer-Shaanan1

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This summary is machine-generated.

Bacterial biofilms form protective calcite mineral structures. Inhibiting biomineralization enzymes like urease disrupts these barriers, increasing antibiotic effectiveness against resistant infections.

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Area of Science:

  • Microbiology
  • Biomineralization
  • Materials Science

Background:

  • Bacteria predominantly form structured biofilms, protected by extracellular polymeric substances.
  • Mechanisms of phenotypic resistance in biofilms, particularly from antibiotics, are not fully understood.
  • A novel mechanism involving active calcite mineral production in biofilm maintenance has been identified.

Purpose of the Study:

  • To investigate the role of calcite mineral production in bacterial biofilm structure and function.
  • To explore the potential of targeting biomineralization for combating antibiotic resistance.

Main Methods:

  • Utilized high-resolution micro-computed tomography (µCT) to visualize mineralized areas within intact bacterial biofilms.
  • Studied the relationship between biofilm structure, mineral composition, and diffusion properties.
  • Investigated the effect of chemical interference with urease on biofilm assembly and permeability.

Main Results:

  • Dense calcium carbonate lamina formation was observed, creating a diffusion barrier that shelters the inner biofilm.
  • Micro-computed tomography (µCT) proved effective in analyzing biofilm structure and predicting permeability.
  • Inhibiting urease disrupted complex biofilm structures, prevented mineral barrier formation, and increased biofilm permeability.

Conclusions:

  • Calcite biomineralization is a key mechanism for structural integrity and protection in bacterial biofilms.
  • Micro-computed tomography (µCT) is a valuable tool for clinical assessment of biofilm permeability.
  • Biomineralization enzymes, such as urease, represent promising therapeutic targets for treating highly resistant bacterial infections.