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Related Experiment Videos

Membrane recognition by vesicular stomatitis virus involves enthalpy-driven protein-lipid interactions.

Fabiana A Carneiro1, M Lucia Bianconi, Gilberto Weissmüller

  • 1Departamento de Bioquímica Médica, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-590, Brazil.

Journal of Virology
|March 22, 2002
PubMed
Summary

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Vesicular stomatitis virus (VSV) glycoprotein G binds cell membranes via electrostatic interactions with negatively charged phospholipids. This binding is crucial for viral fusion and infection, driven by enthalpy.

Area of Science:

  • Virology
  • Biophysics
  • Molecular Biology

Background:

  • Vesicular stomatitis virus (VSV) infection requires viral and cellular membrane fusion.
  • VSV glycoprotein G mediates this fusion in endosomes.
  • VSV G protein lacks typical fusion peptides, suggesting a unique membrane interaction mechanism.

Purpose of the Study:

  • To investigate the interaction mechanism between VSV G protein and liposomes.
  • To elucidate the role of phospholipid composition in VSV G protein binding and membrane fusion.

Main Methods:

  • Force spectroscopy to study VSV G protein-membrane interactions.
  • Isothermal titration calorimetry (ITC) to determine binding thermodynamics.
  • Fluorescence spectroscopy to analyze conformational changes and fusion kinetics.

Related Experiment Videos

Main Results:

  • VSV G protein binding to membranes requires negatively charged phospholipids, indicating electrostatic interactions.
  • Binding is an enthalpically driven process.
  • Increased phosphatidylserine (PS) content significantly enhanced the rate of VSV-induced membrane fusion.

Conclusions:

  • VSV G protein binding to target membranes relies on electrostatic interactions between the protein and negatively charged phospholipids.
  • Membrane fusion is an exothermic process with no apparent entropic constraints.
  • Phosphatidylserine plays a key role in accelerating VSV-mediated membrane fusion.