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Area of Science:

  • Biophysics
  • Membrane Science
  • Computational Biology

Background:

  • Aqueous pore formation and closure in lipid bilayers are fundamental to many biophysical processes.
  • Classical nucleation theory adequately describes large pores, but the free-energy landscape of small, biologically relevant pores remains poorly understood.
  • The existence of metastable "prepores" has been hypothesized from electroporation experiments, yet theoretical resolution has been challenging.

Purpose of the Study:

  • To investigate the conditions under which metastable prepores form in lipid membranes.
  • To explore the free-energy landscape of small aqueous pores using computational methods.
  • To determine the relationship between lipid molecular structure and prepores metastability.

Main Methods:

  • Utilized atomistic simulations to model lipid bilayer behavior.
  • Employed self-consistent field theory with a minimal lipid model for theoretical analysis.
  • Compared results from both complementary computational approaches.

Main Results:

  • Identified the critical role of the relative volume ratio between lipid head groups and tails in pore metastability.
  • Found that lipids with larger head-group volume fractions or shorter saturated tails favor metastable prepores.
  • Observed that lipids with smaller head-group volume fractions or longer unsaturated tails form unstable prepores.

Conclusions:

  • Metastable prepores in lipid membranes are dependent on specific lipid molecular architectures.
  • The findings provide a theoretical framework for understanding prepores formation, bridging experimental hypotheses and computational models.
  • This research clarifies the parameters governing prepores stability, essential for understanding membrane biophysics.