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J Virol, March 1998, p. 1918-1924, Vol. 72, No. 3
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Multiple Residues Contribute to the Inability of Murine CCR-5 To Function as a Coreceptor for Macrophage-Tropic Human Immunodeficiency Virus Type 1 Isolates

Ted M. Ross,1 Paul D. Bieniasz,1,2 and Bryan R. Cullen1,2,*

Department of Genetics1 and Howard Hughes Medical Institute,2 Duke University Medical Center, Durham, North Carolina 27710

Received 26 August 1997/Accepted 14 November 1997

Infection of CD4-positive cells by human immunodeficiency virus type 1 (HIV-1) requires functional interaction of the viral envelope protein with a coreceptor belonging to the chemokine receptor family of seven-membrane-spanning receptors. For the majority of macrophage-tropic HIV-1 isolates, the physiologically relevant coreceptor is the human CCR-5 (hCCR-5) receptor. Although the murine homolog of CCR-5 (mCCR-5) is unable to mediate HIV-1 infection, chimeric hCCR-5/mCCR-5 molecules containing single extracellular domains derived from hCCR-5 are effective coreceptors for certain macrophage-tropic HIV-1 isolates. Here, we have sought to identify residues in hCCR-5 critical for HIV-1 infection by substitution of mCCR-5-derived residues into the context of functional chimeric hCCR-5/mCCR-5 receptor molecules. Using this strategy, we demonstrate that residues 7, 13, and 15 in the first extracellular domain and residue 180 in the third extracellular domain of CCR-5 are important for HIV-1 envelope-mediated membrane fusion. Of interest, certain substitutions, for example, at residues 184 and 185 in the third extracellular domain, have no phenotype when introduced individually but strongly inhibit hCCR-5 coreceptor function when present together. We hypothesize that these changes, which do not preclude chemokine receptor function, may inhibit a conformational transition in hCCR-5 that contributes to HIV-1 infection. Finally, we report that substitution of glycine for valine at residue 5 in CCR-5 can significantly enhance the level of envelope-dependent cell fusion by expressing cells. The diversity of the mutant phenotypes observed in this mutational analysis, combined with their wide distribution across the extracellular regions of CCR-5, emphasizes the complexity of the interaction between HIV-1 envelope and coreceptor.

* Corresponding author. Mailing address: Duke University Medical Center, Box 3025, Room 426 CARL Building, Research Dr., Durham, NC 27710. Phone: (919) 684-3369. Fax: (919) 681-8979.




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