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Related Experiment Video

Updated: Aug 4, 2025

Introducing Shear Stress in the Study of Bacterial Adhesion

Introducing Shear Stress in the Study of Bacterial Adhesion

Published on: September 2, 2011

Three structural solutions for bacterial adhesion pilus stability and superelasticity.

Matthew H Doran¹, Joseph L Baker², Tobias Dahlberg³

¹Department of Physiology & Biophysics, Boston University Chobanian & Avedisian School of Medicine, Boston, MA 02118, USA.

Structure (London, England : 1993)

|March 31, 2023

Summary

Bacterial pili are crucial for host-pathogen interactions. Their structural stability, determined by subunit interactions, dictates force resistance and bacterial attachment, regardless of genetic makeup.

Keywords:

Traveler's diarrhea bacterial adhesion cryo-EM enterotoxigenic Escherichia coli fimbriae force spectroscopy molecular modeling optical tweezers pili steered molecular dynamics

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Last Updated: Aug 4, 2025

Introducing Shear Stress in the Study of Bacterial Adhesion

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Published on: September 2, 2011

Visualization of Twitching Motility and Characterization of the Role of the PilG in Xylella fastidiosa

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Published on: April 8, 2016

Biomimetic Materials to Characterize Bacteria-host Interactions

Biomimetic Materials to Characterize Bacteria-host Interactions

Published on: November 16, 2015

Area of Science:

Microbiology
Structural Biology
Biophysics

Background:

Bacterial adhesion pili are critical virulence factors mediating host-pathogen interactions.
Understanding the structural basis of pilus biophysical properties is essential for developing anti-adhesion strategies.

Purpose of the Study:

To investigate the structural basis of pili from enterotoxigenic (ETEC) and uropathogenic bacteria.
To correlate pilus structure with biophysical properties like force resistance and superelasticity.

Main Methods:

Cryo-electron microscopy (cryo-EM) to determine pilus structures (CFA/I, CS17, CS20).
Force spectroscopy and steered molecular dynamics (MD) simulations to analyze subunit interactions and mechanical properties.

Main Results:

Solved structures of three vaccine target pili from ETEC bacteria.
Demonstrated a strong correlation between subunit-subunit interaction energies and pilus unwinding force.
Identified three key structural solutions for pilus assembly stabilization: layer-to-layer, N-terminal, and extended loop interactions.

Conclusions:

Pilus biophysical properties are tunable through specific structural stabilizing mechanisms.
Superelastic behavior, essential for sustained bacterial attachment, is influenced by these structural solutions.
Findings provide insights into bacterial adhesion mechanisms and potential therapeutic targets.