Amantadine interactions with phase separated lipid membranes.

Area of Science:

• Biophysics
• Membrane Biology
• Pharmacology

Background:

• Amantadine is an antiviral and anti-Parkinsonian drug.
• Biological membranes exhibit lateral heterogeneity with specific lipid domains.
• Amantadine's interaction with membranes is crucial due to its targeting of membrane-bound proteins.

Purpose of the Study:

• To investigate whether amantadine preferentially localizes within specific lipid domains.
• To understand amantadine's impact on membrane properties and lipid domain interactions.

Main Methods:

• Langmuir trough measurements
• Differential scanning calorimetry (DSC)
• Droplet interface bilayers (DIBs)
• Molecular dynamics (MD) simulations

Main Results:

• Amantadine preferentially binds to disordered lipids (e.g., POPC).
• Amantadine decreases the phase transition temperature of lipid mixtures, indicating increased membrane disorder.
• MD simulations confirmed amantadine's association with disordered lipid-rich domains and domain boundaries.

Conclusions:

• Amantadine's preferential localization in disordered lipid domains suggests a mechanism for its interaction with membrane proteins.
• The findings have implications for understanding amantadine's efficacy and potential targets.
• Amantadine's disordering effect on membranes is a key characteristic influencing its biological activity.