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Rabies virus glycoprotein is a trimer.

Y Gaudin1, R W Ruigrok, C Tuffereau

  • 1Laboratoire de génétique des virus, CNRS, Gif sur Yvette, France.

Virology
|April 1, 1992
PubMed
Summary

The rabies virus envelope glycoprotein (G protein) exists as a trimer. This study used electron microscopy and sedimentation analysis to confirm the trimeric structure of the G protein, crucial for understanding rabies virus.

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Area of Science:

  • Virology
  • Structural Biology
  • Biochemistry

Background:

  • The rabies virus envelope glycoprotein (G protein) is essential for viral entry and is a key target for vaccines.
  • Understanding the oligomerization state of the G protein is critical for elucidating its function and for developing effective antiviral strategies.

Purpose of the Study:

  • To determine the oligomerization state of the rabies virus envelope glycoprotein (G protein).
  • To investigate the structural morphology of the G protein using biophysical techniques.

Main Methods:

  • Detergent solubilization of the G protein.
  • Sedimentation analysis to determine the sedimentation coefficient.
  • Electron microscopy (negative staining) for morphological analysis.

Main Results:

  • Most detergents solubilized the G protein as a 4 S monomer.
  • CHAPS detergent solubilized the G protein in a 9 S form, indicating a higher-order oligomer.
  • Electron microscopy confirmed a trimeric structure for native G on the virus and for CHAPS-solubilized G.
  • A low-resolution model of the G protein structure, featuring a "head" and "stalk," was proposed.

Conclusions:

  • The rabies virus G protein naturally exists as a trimer.
  • CHAPS is an effective detergent for preserving the native trimeric structure of the G protein.
  • The structural insights provide a foundation for further studies on G protein function and interactions.

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