Previous Article | Next Article ![]()
J. Virol., Jul 1997, 5003-5011, Vol 71, No. 7
L Picard, G Simmons, CA Power, A Meyer, RA Weiss and PR Clapham
Human immunodeficiency virus type 1 (HIV-1) entry is governed by the
interaction of the viral envelope glycoprotein (Env) with its receptor. The
HIV-1 receptor is composed of two molecules, the CD4 binding receptor and a
coreceptor. The seven-membrane-spanning chemokine receptor CCR-5 is one of
the coreceptors used by primary isolates of HIV-1. We demonstrate that the
mouse homolog of CCR-5 (mCCR-5) does not function as an HIV-1 coreceptor. A
set of chimeras of human CCR-5 and mCCR-5 was studied for Env-induced cell
fusion and HIV-1 infection. Using the HIV-1ADA envelope glycoprotein in a
syncytium formation assay, we show that replacement of any fragment
containing extracellular domains of mCCR-5 by its human counterparts is
sufficient to allow Env-induced fusion. Conversely, replacement of any
fragment containing human extracellular domains by its murine counterpart
did not lead to coreceptor function loss. These results show that several
domains of CCR-5 participate in coreceptor function. In addition, using a
panel of primary nonsyncytium-inducing and syncytium-inducing isolates that
use CCR-5 or both CXCR-4 and CCR-5 as coreceptors, we show that the latter
dual-tropic isolates are less tolerant to changes in CCR-5 than strains
with a more restricted coreceptor use. Thus, different strains are likely
to have different ways of interacting with the CCR-5 coreceptor.
Copyright © 1997, American Society for Microbiology
Multiple extracellular domains of CCR-5 contribute to human immunodeficiency virus type 1 entry and fusion
Chester Beatty Laboratories, Institute of Cancer Research, London, United Kingdom. laurent@icr.ac.uk
This article has been cited by other articles:
| J. Bacteriol. | Mol. Cell. Biol. | Microbiol. Mol. Biol. Rev. |
|---|
| Clin. Vaccine Immunol. | ALL ASM JOURNALS |
|---|