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Area of Science:

  • Biophysics
  • Microbiology
  • Cell Adhesion

Background:

  • Many cells utilize adhesive tethers with yielding elasticity for attachment.
  • Understanding the function of these tethers is crucial for cell adhesion dynamics.

Purpose of the Study:

  • To investigate the functional role of yielding elastic adhesive tethers in bacterial adhesion.
  • To model and simulate the behavior of these tethers using Escherichia coli as a model.

Main Methods:

  • Utilized realistic biophysical models for adhesive bond kinetics and tether elasticity in simulations.
  • Fit models to single molecule force spectroscopy data (new and published).
  • Validated simulations by comparing with experiments measuring E. coli adhesion in flowing fluid.

Main Results:

  • Simulations demonstrated yielding elasticity is essential for bacterial binding in high and variable flow.
  • Yielding elasticity enables even force distribution across multiple bonds, preventing adhesive contact failure.
  • Contrasted with strain-hardening and linear elastic tethers, which concentrate force and lead to failure.

Conclusions:

  • Yielding elasticity is critical for maintaining bacterial adhesion under dynamic flow conditions.
  • This mechanism is vital for noncovalent receptor-ligand bonds that are sensitive to force.
  • The advantages of yielding likely extend to other cells and adhesion scenarios involving unequal bond stretching.