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Journal of Virology, May 2001, p. 4664-4672, Vol. 75, No. 10
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.10.4664-4672.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

DC-SIGN Interactions with Human Immunodeficiency Virus Type 1 and 2 and Simian Immunodeficiency Virus

Stefan Pöhlmann,1 Frédéric Baribaud,1 Benhur Lee,1 George J. Leslie,1 Melissa D. Sanchez,1 Kirsten Hiebenthal-Millow,2 Jan Münch,2,dagger Frank Kirchhoff,2,dagger and Robert W. Doms1,*

Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104,1 and Institute for Clinical and Molecular Virology, University of Erlangen-Nürnberg, 91054 Erlangen, Germany2

Received 30 November 2000/Accepted 21 February 2001

Dendritic cells (DCs) efficiently bind and transmit human immunodeficiency virus (HIV) to cocultured T cells and so may play an important role in HIV transmission. DC-SIGN, a novel C-type lectin that is expressed in DCs, has recently been shown to bind R5 HIV type 1 (HIV-1) strains and a laboratory-adapted X4 strain. To characterize the interaction of DC-SIGN with primate lentiviruses, we investigated the structural determinants of DC-SIGN required for virus binding and transmission to permissive cells. We constructed a panel of DC-SIGN mutants and established conditions which allowed comparable cell surface expression of all mutants. We found that R5, X4, and R5X4 HIV-1 isolates as well as simian immunodeficiency and HIV-2 strains bound to DC-SIGN and could be transmitted to CD4/coreceptor-positive cell types. DC-SIGN contains a single N-linked carbohydrate chain that is important for efficient cell surface expression but is not required for DC-SIGN-mediated virus binding and transmission. In contrast, C-terminal deletions removing either the lectin binding domain or the repeat region abrogated DC-SIGN function. Trypsin-EDTA treatment inhibited DC-SIGN mediated infection, indicating that virus was maintained at the surface of the DC-SIGN-expressing cells used in this study. Finally, quantitative fluorescence-activated cell sorting analysis of AU1-tagged DC-SIGN revealed that the efficiency of virus transmission was strongly affected by variations in DC-SIGN expression levels. Thus, variations in DC-SIGN expression levels on DCs could greatly affect the susceptibility of human individuals to HIV infection.


* Corresponding author. Mailing address: Department of Pathology and Laboratory Medicine, University of Pennsylvania, 806 Abramson, Philadelphia, PA 19104. Phone: (215) 898-0890. Fax: (215) 573-2883. E-mail: doms{at}mail.med.upenn.edu.

dagger Present address: Abteilung Virologie, Institut für Mikrobiologie und Immunologie, Universitätsklinikum Ulm, 89081 Ulm, Germany.


Journal of Virology, May 2001, p. 4664-4672, Vol. 75, No. 10
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.10.4664-4672.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.



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