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Spike--nucleocapsid interaction in Semliki Forest virus reconstructed using network antibodies
D J Vaux1, A Helenius, I Mellman
1Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06510.
Nature
|November 3, 1988
Summary
The Semliki Forest virus nucleocapsid has a receptor for the E2 glycoprotein tail. This interaction explains how viral proteins are selectively incorporated during virus budding.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Semliki Forest virus (SFV) is an enveloped virus with a nucleocapsid core and surface glycoproteins.
- Virus budding is a critical process for viral particle assembly and release.
- The selective incorporation of viral components and exclusion of host proteins during budding is not fully understood.
Purpose of the Study:
- To investigate the molecular interactions governing selective protein incorporation during Semliki Forest virus budding.
- To identify potential receptors on the viral nucleocapsid involved in glycoprotein binding.
Main Methods:
- In vitro immunization techniques were employed to reconstruct key steps of an idiotype network.
- Analysis of interactions between Semliki Forest virus nucleocapsid components and the E2 spike glycoprotein's cytoplasmic tail.
Main Results:
- The study demonstrates that the Semliki Forest virus nucleocapsid possesses a specific receptor.
- This receptor binds to the cytoplasmic tail of the E2 spike glycoprotein.
- Evidence suggests this interaction mediates the selective packaging of viral glycoproteins.
Conclusions:
- The identified nucleocapsid-glycoprotein interaction is crucial for the selective assembly of Semliki Forest virus particles.
- This mechanism explains the preferential inclusion of viral glycoproteins and exclusion of host proteins during virus budding.
- Understanding this interaction provides insights into viral morphogenesis and host-pathogen interactions.