Spatiotemporal pattern formation of membranes induced by surface molecular binding/unbinding.

Area of Science:

• Biophysics
• Materials Science
• Computational Biology

Background:

• Bilayer membranes exhibit complex spatiotemporal dynamics.
• Molecular interactions on membrane surfaces can influence membrane properties and organization.
• Understanding nonequilibrium pattern formation is crucial for biological and synthetic systems.

Purpose of the Study:

• To investigate nonequilibrium membrane pattern formation using advanced simulation techniques.
• To explore the impact of molecular binding and flip-flop dynamics on membrane organization.
• To elucidate the coupling between molecular binding, membrane properties, and pattern evolution.

Main Methods:

• Meshless membrane simulation.
• Modeling molecular binding to membrane leaflets.
• Simulating molecular flip-flop across the bilayer.
• Analyzing spatiotemporal dynamics and domain morphology.

Main Results:

• At high binding rates, spiral-wave patterns emerge; at low rates, homogeneous cycling occurs.
• Changes in spontaneous curvature due to binding couple dynamics with microphase separation.
• Equilibrium conditions yield tiling, stripe, and spot patterns.
• Nonequilibrium conditions generate moving biphasic domains and fluctuating patterns.

Conclusions:

• Molecular binding dynamics significantly influence bilayer membrane pattern formation.
• Nonequilibrium conditions introduce novel spatiotemporal behaviors, including time-irreversible patterns.
• The interplay between binding, membrane properties, and thermodynamics governs emergent membrane structures.