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Three-dimensional Imaging of Bacterial Cells for Accurate Cellular Representations and Precise Protein Localization
06:33

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Published on: October 29, 2019

Bacterial cell surface deformation under external loading.

Yun Chen1, Willem Norde, Henny C van der Mei

  • 1Department of Biomedical Engineering, W.J. Kolff Institute, University Medical Center and University of Groningen, Groningen, The Netherlands.

Mbio
|December 20, 2012
PubMed
Summary

A new model quantifies bacterial adhesion by analyzing the viscoelastic deformation of the contact zone. This approach accurately measures the reduced Young

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Area of Science:

  • Microbiology
  • Biophysics
  • Materials Science

Background:

  • Bacterial adhesion and detachment are influenced by the viscoelastic properties of the contact volume between bacteria and surfaces.
  • Existing deformation models fail to account for the heterogeneous structure of bacteria, comprising soft outer layers and rigid cores.
  • Understanding these properties is crucial for applications like biofilm removal and preventing bacterial colonization.

Purpose of the Study:

  • To present a novel, simple model for calculating the reduced Young's modulus of the bacterial-substratum contact volume.
  • To account for the complex, heterogeneous structure of bacterial cells in deformation modeling.
  • To provide a more accurate assessment of bacterial adhesion mechanics compared to existing models.

Main Methods:

  • Utilized atomic force microscopy (AFM) to measure the deformation of bacterial contact volumes under applied forces.
  • Developed a new model based on the relationship between deformation and external loading force.
  • Assumed contact occurs through a cylinder of constant volume, without prior assumptions on its dimensions or properties.

Main Results:

  • Derived reduced Young's moduli ranging from 8 to 47 kPa for various bacterial strains.
  • Correlated higher reduced Young's moduli with more rigid cell surfaces (less fibrillation, lower EPS, or higher peptidoglycan cross-linking).
  • Observed that the new model yielded significantly lower (up to 100 times) reduced Young's moduli compared to the Hertz model.

Conclusions:

  • The developed model accurately captures the viscoelastic deformation of the bacterial contact volume, reflecting bacterial heterogeneity.
  • The Hertz model overestimates bacterial stiffness by primarily engaging the rigid peptidoglycan layer, not the soft outer surface.
  • This new model offers a more precise method for characterizing bacterial adhesion mechanics and cell wall properties.