Lipid domains in supported lipid bilayer for atomic force microscopy

Area of Science:

• Biophysics
• Materials Science
• Surface Science

Background:

• Supported lipid bilayers (SLBs) are model membrane systems for studying lipid phase behavior.
• Atomic force microscopy (AFM) is a key technique for high-resolution imaging of SLBs.
• AFM also enables visualization of protein-membrane interactions in functionalized SLBs.

Purpose of the Study:

• To investigate the impact of vesicle preparation and deposition conditions on phase-separated domain structures in SLBs.
• To present methods for preparing vesicles and depositing them to form SLBs.
• To discuss AFM techniques for imaging multicomponent SLBs and protein binding.

Main Methods:

• Vesicle preparation techniques (three methods presented).
• Vesicle deposition conditions (three conditions presented).
• Atomic force microscopy (AFM) for imaging phase-separated lipid domains and protein binding.

Main Results:

• The thermal history of vesicles and SLBs significantly influences phase-separated domain formation.
• Specific vesicle preparation and deposition methods yield distinct domain structures.
• AFM successfully visualizes complex lipid phase separation and ligand-mediated protein interactions.

Conclusions:

• Supported lipid bilayers offer a versatile platform for probing lipid phase behavior and protein-membrane interactions.
• Controlling vesicle preparation and deposition is critical for tailoring SLB structure and function.
• AFM is an indispensable tool for characterizing these complex model membrane systems.