title: Selective employment of chemokine receptors as human immunodeficiency virus type 1 coreceptors determined by individual amino acids within the envelope V3 loop.
abstract: The chemokine receptor CCR5 acts as an essential cofactor for cell entry by macrophage-tropic human immunodeficiency virus type 1 (HIV-1) strains, whereas CXCR4 acts as an essential cofactor for T-cell-line-adapted strains. We demonstrated that the specific amino acids in the V3 loop of the HIV-1 envelope protein that determine cellular tropism also regulate chemokine coreceptor preference for cell entry by the virus. Further, a strong correlation was found between HIV-1 strains classified as syncytium inducing in standard assays and those using CXCR4 as a coreceptor. These data support the hypothesis that progressive adaptation to additional coreceptors is a key molecular basis for HIV-1 phenotypic evolution in vivo.
authors.affiliation: Gladstone Institute of Virology and Immunology, San Francisco, California, USA.
authors.forename: R F
authors.initials: RF
authors.lastname: Speck
authors.forename: K
authors.initials: K
authors.lastname: Wehrly
authors.forename: E J
authors.initials: EJ
authors.lastname: Platt
authors.forename: R E
authors.initials: RE
authors.lastname: Atchison
authors.forename: I F
authors.initials: IF
authors.lastname: Charo
authors.forename: D
authors.initials: D
authors.lastname: Kabat
authors.forename: B
authors.initials: B
authors.lastname: Chesebro
authors.forename: M A
authors.initials: MA
authors.lastname: Goldsmith
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015704:CD4 Antigens / Q000378:metabolism; D019556:COS Cells; D015699:HIV Envelope Protein gp120 / Q000235:genetics / Q000378:metabolism*; D015497:HIV-1 / Q000235:genetics / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000235:genetics / Q000378:metabolism*; D019713:Receptors, CCR5; D019718:Receptors, CXCR4; D018121:Receptors, Cytokine / Q000235:genetics / Q000378:metabolism*; D015728:Receptors, HIV / Q000235:genetics / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: D015704:CD4 Antigens; D015699:HIV Envelope Protein gp120; C059762:HIV envelope protein gp120 (305-321); D008565:Membrane Proteins; D010446:Peptide Fragments; D019713:Receptors, CCR5; D019718:Receptors, CXCR4; D018121:Receptors, Cytokine; D015728:Receptors, HIV