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Related Experiment Videos

Membrane fusion.

Zimmerberg1, Chernomordik

  • 1Laboratory of Cellular and Molecular Biophysics, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA

Advanced Drug Delivery Reviews
|June 6, 2000
PubMed
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Membrane fusion, essential for cell processes like exocytosis and viral entry, follows a universal pathway. Lipid properties, not proteins, dictate the fundamental steps and energy barriers in this critical biological event.

Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Dynamics

Background:

  • Protein-catalyzed membrane fusion events like exocytosis and viral fusion share similar energy barriers with protein-free lipid bilayers.
  • Understanding these barriers is crucial for deciphering fundamental biological processes.

Purpose of the Study:

  • To investigate the conserved mechanisms and energy landscapes governing lipid bilayer fusion across different biological contexts.
  • To determine the relative roles of protein machinery and lipid properties in membrane fusion.

Main Methods:

  • Comparative analysis of fusion pathways in exocytosis, viral fusion, and protein-free phospholipid membranes.
  • Experimental investigation of phospholipid bilayer fusion dynamics, including contact, hemifusion, and pore formation.

Related Experiment Videos

  • Assessment of the impact of lipid curvature and membrane tension on fusion progression.

    • Main Results:

    • Identified a conserved fusion pathway involving contact, hemifusion, and fusion pore formation/enlargement, irrespective of protein catalysis.
    • Demonstrated that lipid curvature dictates barriers to hemifusion and fusion pore initiation.
    • Showed that membrane tension drives fusion pore enlargement, a mechanism conserved across biological and artificial systems.

    Conclusions:

    • Lipid energetics, specifically curvature and tension, fundamentally govern the reaction scheme for membrane fusion.
    • While proteins modulate the rate and specificity, the underlying biophysical principles of lipid bilayer fusion are conserved.