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Hydrogel-encapsulated lipid membranes.

Tae-Joon Jeon¹, Noah Malmstadt, Jacob J Schmidt

¹Department of Bioengineering, University of California-Los Angeles, Los Angeles, CA 90095, USA.

Journal of the American Chemical Society

|January 5, 2006

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We stabilized lipid membranes within a polymer hydrogel, enabling stable single-molecule DNA analysis. Encapsulated membranes slowed DNA translocation over 100x, enhancing biomolecular sensing applications.

Area of Science:

Biophysics
Materials Science
Nanotechnology

Background:

Planar lipid membranes are crucial for studying membrane proteins and biomolecular interactions.
Free-standing membranes are unstable, limiting their application in long-term single-molecule studies.
Alpha-hemolysin (aHL) channels are used in nanopore sensing for DNA analysis.

Purpose of the Study:

To develop a method for stabilizing planar lipid membranes using polymer hydrogel encapsulation.
To investigate the effect of encapsulation on membrane stability and its suitability for single-molecule measurements.
To assess the impact of encapsulated membranes on the translocation dynamics of single-stranded DNA through aHL channels.

Main Methods:

In situ photopolymerization was used to encapsulate free-standing planar lipid membranes within a polymer hydrogel.

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The stability of the encapsulated membranes was assessed over time.

Single-molecule measurements were performed using incorporated alpha-hemolysin channel proteins.

Translocation of single-stranded DNA through aHL in both encapsulated and gel-free membranes was analyzed.

Main Results:

Encapsulated lipid membranes demonstrated stability for at least 5 days.
The polymer hydrogel provided a stable environment for single-molecule measurements of incorporated aHL proteins.
Single-stranded DNA translocation through aHL in encapsulated membranes was slowed by over 100 times compared to gel-free membranes.
The stabilized membranes facilitated enhanced single-molecule analysis of DNA.

Conclusions:

In situ photopolymerization effectively stabilizes planar lipid membranes in a polymer hydrogel.
Encapsulated membranes offer a robust platform for long-term single-molecule biophysical studies.
The significant slowing of DNA translocation has implications for advanced DNA analysis and biomolecular sensing.
This technology holds promise for applications in biomolecular sensors, membrane protein studies, and drug discovery.