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• W2077483087 startingPage "521" @default.
• W2077483087 abstract "The molecular mechanism of human immunodeficiency virus type 1 (HIV-1) entry into cells involves specific interactions between the viral envelope glycoprotein gp120 and two target cell proteins, CD4 and either CCR5 or CXCR4 chemokine receptors. In order to delineate the functional role of HIV-1 gp120 subdomains of dualtropic strains in CCR5 coreceptor usage, we used a panel of chimeric viruses in which the V1/V2 and V3 domains of gp120 from the dualtropic HIV-1(KMT) isolate were introduced either alone or in combination into the T-tropic HIV-1(NL4-3) background. These chimeric constructs were employed in cell-cell fusion and cell-free virus infectivity assays using cell lines expressing CD4 and the CCR5 chemokine receptor. In both assays, the V3 domain of HIV-1(KMT) but not the V1/V2 domain proved to be the principal determinant of CCR5 coreceptor usage. However, in the cell-free viral infectivity assay although a chimeric virus with a combined V1/V2 and V3 domains of HIV-1(KMT) efficiently fused with coreceptor expressing cells, yet its infectivity was markedly diminished in CCR5 as well as CXCR4 expressing cells. Restoring a comparable level of infection of such chimeric virus required the C3-V5 domain from HIV-1(KMT) to be introduced. Our present findings confirmed that the V3 domain is the major determinant of fusion activity and cellular tropism, and demonstrated a dispensable role for the V1/V2 domain. In addition the C3-V5 domain appeared to play an important role in viral infectivity when the corresponding V1/V2 and V3 domains are present." @default.
• W2077483087 created "2016-06-24" @default.
• W2077483087 creator A5041141624 @default.
• W2077483087 creator A5083456919 @default.
• W2077483087 creator A5089068986 @default.
• W2077483087 date "2001-07-01" @default.
• W2077483087 modified "2023-09-28" @default.
• W2077483087 title "Role of V3 Independent Domains on a Dualtropic Human Immunodeficiency Virus Type 1 (HIV-1) Envelope gp120 in CCR5 Coreceptor Utilization and Viral Infectivity" @default.
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• W2077483087 doi "https://doi.org/10.1111/j.1348-0421.2001.tb02653.x" @default.
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