Pore-Spanning Plasma Membranes Derived from Giant Plasma Membrane Vesicles

Area of Science:

• Biophysics
• Materials Science
• Cell Biology

Background:

• Giant plasma membrane vesicles (GPMVs) are valuable models for eukaryotic plasma membranes.
• A key challenge is creating surface-based membrane structures for high-resolution, dual-sided analysis.
• Such structures are crucial for advancing chip-based technologies in bioanalysis and sensing.

Purpose of the Study:

• To develop a method for generating planar and pore-spanning plasma membranes (PSPMs) from GPMVs.
• To enable high-resolution analysis of cell membrane surfaces.
• To facilitate applications in studying membrane proteins, host-pathogen interactions, and bioanalytical sensing.

Main Methods:

• Production of GPMVs using two different vesiculation agents.
• Spreading of GPMVs onto activated solid and porous silicon substrates to form planar supported plasma membrane patches.
• Formation of PSPMs by spreading GPMVs on oxygen-plasma activated porous silicon substrates (3.5 μm pore diameter).
• Characterization using fluorescence microscopy and cholesterol extraction experiments.

Main Results:

• Successful generation of planar supported plasma membranes and novel PSPMs from pure GPMVs.
• Demonstration of partial phase separation in PSPMs, with a mobile ordered phase surrounded by a disordered phase.
• Confirmation of phase separation behavior through cholesterol extraction experiments.

Conclusions:

• The study presents a novel method for creating GPMV-derived PSPMs on porous substrates.
• These PSPMs offer a promising platform for advanced bioanalytical and sensing applications.
• The findings advance the ability to study complex cell membrane structures and functions.