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Mechanically-gated Ion Channels

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Tension Response at Adherens Junctions01:26

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Related Experiment Video

Updated: Apr 17, 2026

A Behavioral Assay for Mechanosensation of MARCM-based Clones in Drosophila melanogaster
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Mechanosensing: a regulation sensation.

Courtney Ellison1, Yves V Brun1

  • 1Department of Biology, Indiana University, Bloomington, IN 47405, USA.

Current Biology : CB
|February 5, 2015
PubMed
Summary

Bacteria sense surfaces by detecting flagellum rotation changes, often triggering movement and adhesion. Pseudomonas aeruginosa uses the PilY1 protein as a novel mechanosensor, stimulating virulence upon surface attachment.

Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Mechanobiology

Background:

  • Bacterial surface sensing is crucial for adaptation and virulence.
  • Flagellum rotation obstruction is a known mechanosensing mechanism.
  • Pseudomonas aeruginosa is an opportunistic pathogen with complex regulatory pathways.

Purpose of the Study:

  • To identify novel mechanosensors involved in bacterial surface interactions.
  • To investigate the role of the PilY1 protein in Pseudomonas aeruginosa mechanosensing.
  • To understand how surface attachment influences bacterial virulence.

Main Methods:

  • Investigated bacterial mechanosensing pathways.
  • Focused on the PilY1 protein in Pseudomonas aeruginosa.
  • Analyzed the link between surface attachment and virulence stimulation.

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Main Results:

  • The PilY1 protein acts as a novel mechanosensor in Pseudomonas aeruginosa.
  • PilY1 mediates virulence stimulation in response to surface attachment.
  • This represents a new mechanism for bacterial surface sensing.

Conclusions:

  • PilY1 is a key player in Pseudomonas aeruginosa's response to surfaces.
  • Understanding PilY1 function can reveal new strategies to control bacterial virulence.
  • Bacterial mechanosensing is a complex process involving multiple protein factors.