Peptide-lipid hybrid vesicles with stimuli-responsive phase separation for controlled membrane functions

Area of Science:

• Biomaterials Science
• Supramolecular Chemistry
• Membrane Biophysics

Background:

• Peptide-lipid conjugates offer tunable self-assembly properties.
• Vesicle formation is crucial for drug delivery and biomimetic systems.
• Controlled membrane dynamics are key for responsive materials.

Purpose of the Study:

• To investigate the self-assembly and responsive behavior of disulfide-tethered peptide-lipid conjugates.
• To explore the potential of triggered membrane phase separation for cargo release.
• To characterize the structural and dynamic changes in hybrid vesicles.

Main Methods:

• Synthesis of disulfide-tethered peptide-lipid conjugates.
• Self-assembly into hybrid vesicles.
• Stimuli-responsive characterization using dithiothreitol (DTT).
• Analysis of membrane domain formation and vesicle morphology.
• Assessment of temperature-dependent cargo release kinetics.

Main Results:

• Homogeneously distributed peptide-lipid hybrid vesicles were successfully formed.
• Dithiothreitol treatment induced spontaneous phase separation into lipid-rich and peptide-rich domains.
• Vesicle size and shape were maintained post-phase separation.
• Enhanced temperature-dependent cargo release was observed due to membrane phase separation.

Conclusions:

• Disulfide bonds provide a trigger for controlled membrane reorganization in hybrid vesicles.
• Phase separation of peptide-lipid membranes can be harnessed for tunable cargo delivery.
• These hybrid vesicles represent a promising platform for smart biomaterials.