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Cholesterol stabilizes hemifused phospholipid bilayer vesicles.

R A García1, S P Pantazatos, D P Pantazatos

  • 1Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, 2153 North Campus Drive, 60208-3500, Evanston, IL, USA.

Biochimica Et Biophysica Acta
|April 5, 2001
PubMed
Summary

Cholesterol inhibits full membrane fusion in oppositely charged phospholipid vesicles. It stabilizes the hemifused intermediate, preventing complete fusion by reducing bilayer tension.

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Area of Science:

  • Biochemistry
  • Membrane Biophysics
  • Lipid Bilayer Dynamics

Background:

  • Membrane fusion is critical for cellular processes.
  • Cholesterol's role in membrane fusion is complex and not fully understood.
  • Phospholipid vesicle interactions provide a model system to study fusion mechanisms.

Purpose of the Study:

  • To investigate the effect of cholesterol concentration on the fusion of oppositely charged phospholipid vesicles.
  • To elucidate the mechanism by which cholesterol influences hemifusion and full fusion stages.

Main Methods:

  • Preparation of cationic and anionic phospholipid vesicles with varying cholesterol content.
  • Real-time observation of vesicle pairwise interactions using fluorescence video microscopy.
  • Electrophoretic maneuvering of vesicles to induce controlled contact.

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Main Results:

  • High cholesterol (33-50 mole%) significantly favored hemifusion (over 80% of events).
  • Low cholesterol (<=10 mole%) promoted full fusion in approximately 70% of interactions.
  • Cholesterol stabilizes the hemifused intermediate and reduces bilayer tension, hindering full fusion.

Conclusions:

  • Cholesterol acts as an inhibitor of full fusion in this vesicle model.
  • The adhesion-condensation mechanism is supported by cholesterol's role in hemifusion formation.
  • Reduced membrane tension due to cholesterol impedes the transition from hemifusion to full fusion.