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Microbial mechanosensation.

Andriy Anishkin¹, Ching Kung

¹Department of Biology, University of Maryland, College Park, MD 20742, USA. anisan@umd.edu

Current Opinion in Neurobiology

|July 12, 2005

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Bacterial mechanosensitive channels, structural models of mechanosensation, open upon direct bilayer stretch force. These biophysical principles offer broad insight into protein-membrane interactions and gating.

Area of Science:

Biophysics
Structural Biology
Membrane Biology

Background:

Bacterial mechanosensitive channels are key models for understanding mechanosensation.
Atomic-level structural data is available for these channels.

Purpose of the Study:

To elucidate the structural and biophysical mechanisms of mechanosensation.
To investigate the role of the lipid bilayer in channel gating.

Main Methods:

Cloning, purification, and crystallization of mechanosensitive channels.
Genetic, biochemical, and physical analyses.
Molecular dynamics simulations of channel-gated mechanisms.
Characterization of TRP family mechanosensitive channels in yeast.

Main Results:

Related Experiment Videos

Mechanosensitive channels directly sense stretch force from the lipid bilayer.
Simulations confirm channel opening in response to bilayer stretch.
New microbial mechanosensitive channels from the TRP family identified in yeast.

Conclusions:

Mechanosensitive channels gate through direct interaction with lipid bilayer tension.
Fundamental biophysical principles govern channel gating.
These channels provide insights into protein-membrane interactions and hydrophobic hydration in gating.