Image reconstructions of helical assemblies of the HIV-1 CA protein

Su Li, Christopher P. Hill, Wesley I. Sundquist () and John T. Finch ()
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Su Li: University of Utah
Christopher P. Hill: University of Utah
Wesley I. Sundquist: University of Utah
John T. Finch: MRC Laboratory of Molecular Biology

Nature, 2000, vol. 407, issue 6802, 409-413

Abstract: Abstract The type 1 human immunodeficiency virus (HIV-1) contains a conical capsid comprising ∼1,500 CA protein subunits, which organizes the viral RNA genome for uncoating and replication in a new host cell. In vitro, CA spontaneously assembles into helical tubes and cones that resemble authentic viral capsids1,2,3,4,5,6,7. Here we describe electron cryo-microscopy and image reconstructions of CA tubes from six different helical families. In spite of their polymorphism, all tubes are composed of hexameric rings of CA arranged with approximate local p6 lattice symmetry. Crystal structures of the two CA domains were ‘docked’ into the reconstructed density, which showed that the amino-terminal domains form the hexameric rings and the carboxy-terminal dimerization domains connect each ring to six neighbours. We propose a molecular model for the HIV-1 capsid that follows the principles of a fullerene cone6, in which the body of the cone is composed of curved hexagonal arrays of CA rings and the ends are closed by inclusion of 12 pentagonal ‘defects’.

Date: 2000
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DOI: 10.1038/35030177

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