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J. Virol., 09 1997, 6305-6314, Vol 71, No. 9
BJ Doranz, ZH Lu, J Rucker, TY Zhang, M Sharron, YH Cen, ZX Wang, HH Guo, JG Du, MA Accavitti, RW Doms and SC Peiper
The chemokine receptor CCR5 is the major fusion coreceptor for
macrophage-tropic strains of human immunodeficiency virus type 1 (HIV- 1).
To define the structures of CCR5 that can support envelope (Env)- mediated
membrane fusion, we analyzed the activity of homologs, chimeras, and
mutants of human CCR5 in a sensitive gene reporter cell- cell fusion assay.
Simian, but not murine, homologs of CCR5 were fully active as HIV-1 fusion
coreceptors. Chimeras between CCR5 and divergent chemokine receptors
demonstrated the existence of two distinct regions of CCR5 that could be
utilized for Env-mediated fusion, the amino- terminal domain and the
extracellular loops. Dual-tropic Env proteins were particularly sensitive
to alterations in the CCR5 amino-terminal domain, suggesting that this
domain may play a pivotal role in the evolution of coreceptor usage in
vivo. We identified individual residues in both functional regions, Asp-11,
Lys-197, and Asp-276, that contribute to coreceptor function. Deletion of a
highly conserved cytoplasmic motif rendered CCR5 incapable of signaling but
did not abrogate its ability to function as a coreceptor, implying the
independence of fusion and G-protein-mediated chemokine receptor signaling.
Finally, we developed a novel monoclonal antibody to CCR5 to assist in
future studies of CCR5 expression.
Copyright © 1997, American Society for Microbiology
Two distinct CCR5 domains can mediate coreceptor usage by human immunodeficiency virus type 1
Department of Pathology, University of Pennsylvania, Philadelphia 19104, USA.
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