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Journal of Virology, April 2001, p. 3626-3635, Vol. 75, No. 8
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.8.3626-3635.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Characterization of Intracellular Reverse Transcription Complexes of Human Immunodeficiency Virus Type 1

Ariberto Fassati1,2 and Stephen P. Goff1,*

Department of Biochemistry and Molecular Biophysics, Howard Hughes Medical Institute, Columbia University College of Physicians and Surgeons, New York, New York 10032,1 and Wohl Virion Centre, Windeyer Institute, University College London, London W1P 6BD, United Kingdom2

Received 9 June 2000/Accepted 23 January 2001

To examine the early events of the life cycle of human immunodeficiency virus type 1 (HIV-1), we analyzed the intracellular complexes mediating reverse transcription isolated from acutely infected cells. Partial purification of the reverse transcription complexes (RTCs) by equilibrium density fractionation and velocity sedimentation indicated that two species of RTCs are formed but only one species is able to synthesize DNA. Most of the capsid, matrix, and reverse transcriptase (RT) proteins dissociate from the complex soon after cell infection, but Vpr remains associated with the RTC. The RTCs isolated 1, 4, and 7 h after infection are competent for reverse transcription in vitro, indicating that a small proportion of RT remains associated with them. HIV RTCs isolated early after infection have a sedimentation velocity of approximately 560S. Later, different species with a sedimentation velocity ranging from 350S to 100S appear. Nuclear-associated RTCs have a sedimentation velocity of 80S. Shortly after initiation of reverse transcription, the viral strong-stop DNA within the RTC is sensitive to nuclease digestion and becomes protected when reverse transcription is almost completed.

* Corresponding author. Mailing address: Department of Biochemistry and Molecular Biophysics, Howard Hughes Medical Institute, Columbia University College of Physicians and Surgeons, 701 W. 168th St., New York, NY 10032. Phone: (212) 305-3794. Fax: (212) 305-8692. E-mail: goff{at}cuccfa.ccc.columbia.edu.

Journal of Virology, April 2001, p. 3626-3635, Vol. 75, No. 8
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.8.3626-3635.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.