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Journal of Virology, April 1999, p. 2901-2908, Vol. 73, No. 4
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Interaction of the Human Immunodeficiency Virus Type 1 Nucleocapsid with Actin

Bindong Liu,1 Renke Dai,2 Chun-Juan Tian,1 Liza Dawson,1 Robert Gorelick,3 and Xiao-Fang Yu1,*

Department of Molecular Microbiology and Immunology, Johns Hopkins University School of Hygiene and Public Health, Baltimore, Maryland 212051; Laboratory of Molecular Carcinogenesis, National Cancer Institute, Bethesda, Maryland 208922; and AIDS Vaccine Program, National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, Maryland 217023

Received 28 July 1998/Accepted 14 December 1998

The nucleocapsid (NC) domain of the retrovirus Gag protein plays several important roles in the viral life cycle, including virus assembly, viral genomic RNA encapsidation, primer tRNA placement, and enhancement of viral reverse transcription. In this study, deletion of NC domain of human immunodeficiency virus type 1 (HIV-1) Gag was found to drastically reduce virus particle production in CD4+ T cells. Cellular fractionation experiments showed that although most of the uncleaved wild-type HIV-1 Gag, unmyristylated Gag, and p6Gag domain-truncated Gag molecules copurified with the host cell cytoskeleton, most of the mutant Gag molecules lacking both the NC and p6Gag domains failed to cofractionate with cytoskeleton. In wild-type virus-infected cells, in which the viral protease was active, the cleaved NCp7 copurified with the cytoskeleton, whereas most of the MAp17 and CAp24 did not. Monoclonal antibody against actin coimmunoprecipitated full-length Gag and p6Gag domain-truncated Gag molecules from cell lysates but failed to precipitate the truncated mutant Gag molecules lacking NC plus p6Gag. Purified recombinant NCp7, but not CAp24, was able to bind F-actin in cosedimentation experiments. Furthermore, wild-type NCp7 and a zinc finger mutant NCp7(F16A), like a cellular actin-binding protein (the villin headpiece), bound F-actin in a dose-dependent fashion in vitro. Taken together, these results suggest that HIV-1 NCp7 can bind F-actin directly and that interaction between HIV-1 Gag and the actin cytoskeleton through the NC domain may play an important role in HIV-1 assembly and/or other steps of the viral life cycle.

* Corresponding author. Mailing address: Department of Molecular Microbiology and Immunology, Johns Hopkins University School of Hygiene and Public Health, Room E4012, 615 N. Wolfe St., Baltimore, MD 21205. Phone: (410) 955-3768. Fax: (410) 614-8263. E-mail: xfyu{at}jhsph.edu.

Journal of Virology, April 1999, p. 2901-2908, Vol. 73, No. 4
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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