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Journal of Virology, April 2003, p. 4409-4414, Vol. 77, No. 7
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.7.4409-4414.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Disassembly of Human Immunodeficiency Virus Type 1 Cores In Vitro Reveals Association of Nef with the Subviral Ribonucleoprotein Complex

Brett M. Forshey and Christopher Aiken*

Department of Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232

Received 19 September 2002/ Accepted 2 January 2003

The human immunodeficiency virus type 1 (HIV-1) virulence factor Nef enhances viral infectivity in single-cycle infection assays and accelerates HIV-1 replication in vitro. It has been reported that the effects of Nef are mediated early after viral entry and before the completion of reverse transcription, as viral DNA synthesis is strongly attenuated during infection by Nef-defective virions. Our previous work has demonstrated that Nef is associated with mature HIV-1 cores, implicating Nef in the regulation of HIV-1 core stability. Here we report a comparative analysis of HIV-1 cores isolated from wild-type and Nef-defective particles. We observed no effect of Nef on HIV-1 core structure or stability; however, Nef cosedimented with a subviral ribonucleoprotein complex following dissociation of CA. These results indicate that Nef interacts tightly with an internal component of the HIV-1 core. They further suggest that virion-associated Nef may facilitate an early step in HIV-1 infection following dissociation of the viral capsid in the target cell.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Vanderbilt University School of Medicine, A-5301 Medical Center North, Nashville, TN 37232-2363. Phone: (615) 343-7037. Fax: (615) 343-7392. E-mail: chris.aiken{at}mcmail.vanderbilt.edu.

Journal of Virology, April 2003, p. 4409-4414, Vol. 77, No. 7
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.7.4409-4414.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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