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Journal of Virology, February 2000, p. 1168-1177, Vol. 74, No. 3
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Biochemical and Structural Analysis of Isolated
Mature Cores of Human Immunodeficiency Virus Type 1
Reinhold
Welker,
Heinrich
Hohenberg,
Uwe
Tessmer,
Carola
Huckhagel, and
Hans-Georg
Kräusslich*
Heinrich-Pette-Institut für
experimentelle Virologie und Immunologie an der Universität
Hamburg, D-20251 Hamburg, Germany
Received 3 August 1999/Accepted 4 November 1999
Mature human immunodeficiency virus type 1 (HIV-1) particles
contain a cone-shaped core structure consisting of the internal ribonucleoprotein complex encased in a proteinaceous shell derived from
the viral capsid protein. Because of their very low stability after
membrane removal, HIV-1 cores have not been purified in quantities
sufficient for structural and biochemical analysis. Based on our in
vitro assembly experiments, we have developed a novel method for
isolation of intact mature HIV-1 cores. Concentrated virus suspensions
were briefly treated with nonionic detergent and immediately
centrifuged in a microcentrifuge for short periods of time. The
resuspended pellet was subsequently analyzed by negative-stain and
thin-section electron microscopy and by immunoelectron microscopy. Abundant cone-shaped cores as well as tubular and aberrant structures were observed. Stereo images showed that core structures preserved their three-dimensional architecture and exhibited a regular
substructure. Detailed analysis of 155 cores revealed an average length
of ca. 103 nm, an average diameter at the base of ca. 52 nm, and an
average angle of 21.3°. There was significant variability in all
parameters, indicating that HIV cores are not homogeneous. Immunoblot
analysis of core preparations allowed semiquantitative estimation of
the relative amounts of viral and cellular proteins inside the HIV-1 core, yielding a model for the topology of various proteins inside the virion.
*
Corresponding author. Mailing address:
Heinrich-Pette-Institut für experimentelle Virologie und
Immunologie an der Universität Hamburg, Martinistr. 52, D-20251
Hamburg, Germany. Phone: 49 40 48051-241. Fax: 49 40 48051-184. E-mail:
hgk{at}hpi.uni-hamburg.de.

Present address: Department of Molecular Genetics and Microbiology,
State University of New York, Stony Brook, NY 11794-5222.
Journal of Virology, February 2000, p. 1168-1177, Vol. 74, No. 3
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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