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Related Concept Videos

Adhesion01:14

Adhesion

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Fimbriae, Pili, and Axial Filaments01:28

Fimbriae, Pili, and Axial Filaments

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Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...
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Cell Adhesion in Plants01:14

Cell Adhesion in Plants

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Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose,...
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Bacterial Transformation01:33

Bacterial Transformation

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In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
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Bacterial Signaling01:30

Bacterial Signaling

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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

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Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
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Related Experiment Video

Updated: Feb 14, 2026

Introducing Shear Stress in the Study of Bacterial Adhesion
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Introducing Shear Stress in the Study of Bacterial Adhesion

Published on: September 2, 2011

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Bacterial Adhesion Pili.

Chelsea R Epler Barbercheck1, Esther Bullitt2, Magnus Andersson3

  • 1Department of Physiology & Biophysics, Boston University School of Medicine, Boston, MA, USA.

Sub-Cellular Biochemistry
|February 22, 2018
PubMed
Summary
This summary is machine-generated.

Escherichia coli adhesion pili are essential for bacterial infection, exhibiting unique biomechanical properties that enable survival in diverse environments and facilitate tissue-specific colonization.

Keywords:
FimbriaeOptical tweezersPathogenesisPilinsVirulence factors

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Area of Science:

  • Microbiology
  • Biophysics
  • Biochemistry

Background:

  • Escherichia coli utilize adhesion pili (fimbriae) for host-pathogen interactions.
  • Pili are crucial for initiating bacterial infections and represent potential therapeutic targets.
  • Understanding pilus structure and function is key to developing novel antibacterial strategies.

Purpose of the Study:

  • To elucidate the molecular mechanisms and biomechanical roles of adhesion pili in Escherichia coli pathogenesis.
  • To investigate the structure and assembly of pili.
  • To explore the biophysical properties of pili and their adaptation to specific host environments.

Main Methods:

  • High-resolution imaging techniques.
  • Force spectroscopy, including optical tweezers.
  • Fluid flow chamber experiments.

Main Results:

  • Adhesion pili possess unique biomechanical properties enabling bacteria to withstand fluid shear forces.
  • Pilus biomechanics are niche-specific, demonstrating organ-specific adaptations for infection.
  • These properties are critical for overcoming hydrodynamic challenges during pathogenesis.

Conclusions:

  • Pilus biomechanical properties are integral to Escherichia coli pathogenesis.
  • Organ-specific adaptation of pili facilitates bacterial colonization of target tissues.
  • Targeting pilus biomechanics offers a promising avenue for antibacterial therapeutics.