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Three-Phase Coexistence in Lipid Membranes.

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Researchers visualized three coexisting lipid phases in biomimetic membranes using atomic force microscopy (AFM). This study reveals insights into lipid-lipid interactions and membrane phase behavior, identifying a "disordered gel" state.

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Area of Science:

  • Biophysics
  • Materials Science
  • Cell Biology

Background:

  • Phospholipid ternary systems serve as models for lipid-lipid interactions impacting cell signaling and protein translocation.
  • Understanding membrane phase behavior, especially three-phase coexistence, remains challenging due to difficulties in distinguishing phases.

Purpose of the Study:

  • To provide the first direct visualization of three coexisting lipid phases in biomimetic cell membranes.
  • To investigate the formation mechanisms and properties of lipid domains within these systems.

Main Methods:

  • Utilized a combination of atomic force microscopy (AFM) modes to image lipid phases.
  • Analyzed domain heights and mechanical properties.
  • Correlated findings with existing NMR data on lipid chain disorder.

Main Results:

  • Successfully imaged three coexisting lipid phases, offering direct evidence for this proposed state.
  • Observed domain formation via nucleation or spinodal decomposition, sometimes simultaneously.
  • Found that gel (lβ) domains exhibit reduced structural integrity in the three-phase region, supporting a "disordered gel" hypothesis.
  • Documented "tree-ring growth" in disordered lβ domains, suggesting kinetic trapping and compositional heterogeneity.

Conclusions:

  • The study provides the first direct AFM visualization of three coexisting lipid phases in biomimetic membranes.
  • Findings support the existence of a "disordered gel" state and offer explanations for domain formation and growth mechanisms.
  • The research enhances understanding of lipid-lipid interactions and their influence on membrane properties.