Dynamic Fingering in Adhered Lipid Membranes

Area of Science:

• Biophysics
• Materials Science
• Cell Biology

Background:

• Artificial lipid membranes serve as models for cellular organization and bio-inspired technologies.
• Understanding dynamic processes in these membranes is crucial for both fundamental research and technological applications.

Purpose of the Study:

• To experimentally demonstrate and characterize a pattern-forming process in a biotin-avidin adhered lipid bilayer system.
• To investigate the relationship between adhesion protein density and the dynamics of pore formation (fingering patterns).

Main Methods:

• Utilized a lipid bilayer membrane adhered to a solid-supported membrane via biotin-avidin interactions.
• Employed confocal fluorescence microscopy to record time-series data of dynamic fingering patterns.
• Analyzed the growth dynamics and morphological changes of the fingering patterns.

Main Results:

• Observed micrometer-scale elongated pores (fingers) growing from stabilized holes in the upper lipid membrane.
• Finger growth exhibited saltatory behavior on the scale of tens of seconds.
• Found an exponential decrease in finger growth rate and a linear decrease in finger width with increasing adhesion protein density.

Conclusions:

• The observed fingering patterns and their growth dynamics are consistent with a thermodynamic description of dynamic pore formation.
• This study provides insights into pattern formation in adhered lipid membranes, relevant to biological systems and material design.