A one-dimensional continuum elastic model for membrane-embedded gramicidin dimer dissociation.

Area of Science:

• Biophysics
• Membrane protein dynamics
• Lipid bilayer mechanics

Background:

• Membrane elastic properties affect membrane proteins.
• Gramicidin A channels form via subunit dimerization.
• Channel formation induces local bilayer deformation.

Purpose of the Study:

• To investigate bilayer junction response to disjoining forces.
• To explore the impact of non-rigid subunits on channel-bilayer coupling.
• To model gramicidin A channel stability.

Main Methods:

• Developed a one-dimensional energetic model.
• Relaxed the assumption of rigid subunits and interfaces.
• Analyzed bilayer junction response to disjoining forces.

Main Results:

• The model reproduces key features of bilayer regulation of gramicidin channel lifetimes.
• Increasing hydrophobic mismatch enhances the disjoining force.
• Non-rigid subunits influence channel-bilayer coupling.

Conclusions:

• Bilayer junction flexibility is crucial for understanding channel-bilayer interactions.
• The model provides a framework for studying membrane protein regulation by lipid bilayers.
• Findings advance the understanding of how membrane properties affect protein function.