A Membrane Tension-Responsive Mechanosensitive DNA Nanomachine

Area of Science:

• Biophysics
• Nanotechnology
• Molecular Biology

Background:

• Cellular processes rely on physical forces within lipid membranes.
• Membrane curvature and tension are critical biophysical parameters.
• Existing methods for measuring membrane tension are limited.

Purpose of the Study:

• To design a DNA nanomachine that quantifies membrane tension and curvature.
• To mimic the function of natural mechanosensitive PIEZO channels.
• To enable real-time visualization of membrane tension dynamics.

Main Methods:

• Development of a mechanosensitive DNA (MSD) nanomachine.
• Incorporation of a DNA nanopore, cholesterol anchors, and spiropyran fluorophore.
• Utilizing fluorescence changes to detect membrane tension-induced spiropyran isomerization.

Main Results:

• The MSD nanomachine successfully converts membrane tension changes into fluorescence signals.
• The DNA nanopore amplifies subtle tension variations, inducing spiropyran isomerization.
• Established a correlation between measured membrane tension and curvature via the Young-Laplace equation.

Conclusions:

• The developed DNA nanotechnology provides a novel strategy for studying membrane mechanics.
• This approach allows for real-time monitoring of membrane tension and curvature.
• Opens new avenues for investigating cellular processes in physiological and pathological conditions.