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Assembly and analysis of conical models for the HIV-1 core
B K Ganser1, S Li, V Y Klishko
1Department of Biochemistry, University of Utah, Salt Lake City, UT 84132, USA.
Science (New York, N.Y.)
|January 5, 1999
Summary
Researchers assembled synthetic human immunodeficiency virus (HIV) cores in vitro, revealing their conical structure is organized like fullerene cones. This finding offers new insights into HIV capsid assembly and fullerene science.
Area of Science:
- Structural biology
- Virology
- Materials science
Background:
- The human immunodeficiency virus (HIV) core particle, central to infectivity, has an unusual conical shape.
- This core comprises genomic RNA complexed with nucleocapsid (NC) proteins, enclosed by a capsid (CA) protein shell.
Purpose of the Study:
- To develop a method for in vitro assembly of HIV-1 core particles.
- To investigate the structural organization and geometric principles governing HIV core formation.
Main Methods:
- Assembly of conical structures using purified recombinant HIV-1 CA-NC fusion proteins and RNA templates.
- Morphological and structural analysis of synthetic cores using electron microscopy.
- Analysis of cone angles based on hexagonal lattice organization and Euler's theorem.
Main Results:
- Successfully assembled synthetic HIV cores in vitro that mimic the size and morphology of authentic viral cores.
- Demonstrated that synthetic and viral cores exhibit quantized cone angles, consistent with organization on conical hexagonal lattices.
- Observed that both viral and most synthetic cores possess a cone angle of approximately 19 degrees, the narrowest allowed angle.
Conclusions:
- The HIV core's structure is organized according to fullerene cone principles, similar to elemental carbon structures.
- This fullerene-like organization suggests geometric constraints play a crucial role in HIV capsid assembly.
- The findings provide a new perspective on viral core formation and potential therapeutic targets.