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Related Experiment Videos

Membrane proteins organize a symmetrical virus.

K Forsell1, L Xing, T Kozlovska

  • 1Karolinska Institute, Department of Biosciences at Novum, S-141 57 Huddinge, Sweden.

The EMBO Journal
|October 3, 2000
PubMed
Summary

Alphavirus maturation relies on membrane proteins, not just the nucleocapsid. This study shows viral membrane proteins directly organize the icosahedral structure of alphaviruses.

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Alphaviruses are enveloped viruses with icosahedral symmetry, maturing via budding at the plasma membrane.
  • A prevailing model suggests viral maturation is driven by interactions between membrane spike proteins and a preformed nucleocapsid (NC).
  • This model posits that the nucleocapsid dictates the T=4 geometry through specific interactions with capsid proteins (CPs).

Purpose of the Study:

  • To challenge the prevailing model of alphavirus maturation.
  • To investigate the role of capsid proteins (CPs) and membrane proteins in determining viral geometry.
  • To elucidate the mechanisms underlying the organization of the icosahedral conformation in alphaviruses.

Main Methods:

  • Utilized a Semliki Forest virus mutant with defective capsid protein (CP) assembly.

Related Experiment Videos

  • Analyzed viral particle formation in the absence of preformed nucleocapsids.
  • Examined the contribution of spike-spike and spike-CP interactions to viral structure.

    • Main Results:

    • The capsid gene mutant, unable to form nucleocapsids, still produced particles with correct T=4 geometry and protein stoichiometry.
    • This demonstrates that intact nucleocapsids are not essential for achieving the characteristic icosahedral conformation.
    • Viral membrane proteins, through spike-spike and spike-CP interactions, were shown to directly organize the viral structure.

    Conclusions:

    • The findings challenge the model where nucleocapsids solely dictate alphavirus T=4 geometry.
    • Membrane proteins play a direct and crucial role in organizing the icosahedral conformation of alphaviruses.
    • This highlights a novel mechanism in viral assembly and maturation involving direct protein-protein interactions at the membrane interface.