Structure and Composition of Native Membrane Derived Polymer-Supported Lipid Bilayers

Area of Science:

• Biomaterials Science
• Membrane Biophysics
• Analytical Chemistry

Background:

• Supported lipid bilayers (SLBs) are crucial model systems for cell membrane research.
• Increasing compositional complexity of SLBs, using native cellular membrane-derived SLBs (nSLBs), aims to better mimic cellular environments.
• Characterization of nSLBs is essential due to their complex biomimetic nature.

Purpose of the Study:

• To establish an analytical workflow for characterizing the molecular composition and structure of nSLBs.
• To investigate the structural and compositional properties of nSLBs formed from hybrid vesicles (native membrane material and synthetic lipids).
• To guide future research in the production and characterization of nSLBs.

Main Methods:

• Utilized a combination of fluorescence microscopy, neutron reflectometry, and secondary ion mass spectrometry.
• Analyzed nSLB systems formed from hybrid vesicles.
• Investigated the effect of PEGylated lipids on the hydration layer and topology of nSLBs on silicon substrates.

Main Results:

• Demonstrated that nSLBs form a continuous structure with complete mixing of native and synthetic lipid components.
• Showed that the molecular stoichiometry of nSLBs mirrors that of the parent hybrid vesicles.
• Revealed that PEGylated lipids do not significantly alter the hydration layer on silicon substrates, but nSLBs exhibit increased topology compared to synthetic SLBs.

Conclusions:

• The developed analytical workflow provides new insights into the structure, composition, and quality of nSLB systems.
• nSLBs offer a more biomimetic platform with properties reflecting their native membrane origins.
• This study provides a foundational guide for researchers working with nSLBs and other complex membrane mimetics.