Alternative coreceptor requirements for efficient CCR5- and CXCR4-mediated HIV-1 entry into macrophages

Kieran Cashin, Michael Roche, Jasminka Sterjovski, Anne Ellett, Lachlan Robert Gray, Anthony Cunningham, Paul Ramsland, Melissa Churchill, Paul Gorry

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

Macrophage-tropism of human immunodeficiency virus type 1 (HIV-1) is distinct from coreceptor specificity of the viral envelope glycoproteins (Env), but the virus-cell interactions that contribute to efficient HIV-1 entry into macrophages, particularly via CXCR4, are not well understood. Here, we characterized a panel of HIV-1 Envs that use CCR5 (n=14) or CXCR4 (n=6) to enter monocyte-derived macrophages (MDM) with varying degrees of efficiency. Our results show that efficient CCR5-mediated MDM entry by Env-pseudotyped reporter viruses is associated with increased tolerance of several mutations within the CCR5 N-terminus. In contrast, efficient CXCR4-mediated MDM entry was associated with reduced tolerance of a large deletion within the CXCR4 N-terminus. Env sequence analysis and structural modeling identified amino acid variants at positions 261 and 263 within the gp41 interactive region of gp120, and a variant at position 326 within the gp120 V3 loop that were associated with efficient CXCR4-mediated MDM entry. Mutagenesis studies showed that the gp41 interaction domain variants exert a significant but strain-specific influence on CXCR4-mediated MDM entry, suggesting that the structural integrity of the gp120-gp41 interface is important for efficient CXCR4-mediated MDM entry of certain HIV-1 strains. However, the presence of Ile326 in the gp120 V3 loop stem, which we show by molecular modeling is located at the gp120-coreceptor interface and predicted to interact with the CXCR4 N-terminus, was found to be critical for efficient CXCR4-mediated MDM entry of divergent CXCR4-using Envs. Together, the results of our study provide novel insights into alternative mechanisms of Env-coreceptor engagement that are associated with efficient CCR5- and CXCR4-mediated HIV-1 entry into macrophages.
Original languageEnglish
Pages (from-to)10699 - 10709
Number of pages11
JournalJournal of Virology
Volume85
Issue number20
DOIs
Publication statusPublished - 2011

Cite this

Cashin, Kieran ; Roche, Michael ; Sterjovski, Jasminka ; Ellett, Anne ; Gray, Lachlan Robert ; Cunningham, Anthony ; Ramsland, Paul ; Churchill, Melissa ; Gorry, Paul. / Alternative coreceptor requirements for efficient CCR5- and CXCR4-mediated HIV-1 entry into macrophages. In: Journal of Virology. 2011 ; Vol. 85, No. 20. pp. 10699 - 10709.
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abstract = "Macrophage-tropism of human immunodeficiency virus type 1 (HIV-1) is distinct from coreceptor specificity of the viral envelope glycoproteins (Env), but the virus-cell interactions that contribute to efficient HIV-1 entry into macrophages, particularly via CXCR4, are not well understood. Here, we characterized a panel of HIV-1 Envs that use CCR5 (n=14) or CXCR4 (n=6) to enter monocyte-derived macrophages (MDM) with varying degrees of efficiency. Our results show that efficient CCR5-mediated MDM entry by Env-pseudotyped reporter viruses is associated with increased tolerance of several mutations within the CCR5 N-terminus. In contrast, efficient CXCR4-mediated MDM entry was associated with reduced tolerance of a large deletion within the CXCR4 N-terminus. Env sequence analysis and structural modeling identified amino acid variants at positions 261 and 263 within the gp41 interactive region of gp120, and a variant at position 326 within the gp120 V3 loop that were associated with efficient CXCR4-mediated MDM entry. Mutagenesis studies showed that the gp41 interaction domain variants exert a significant but strain-specific influence on CXCR4-mediated MDM entry, suggesting that the structural integrity of the gp120-gp41 interface is important for efficient CXCR4-mediated MDM entry of certain HIV-1 strains. However, the presence of Ile326 in the gp120 V3 loop stem, which we show by molecular modeling is located at the gp120-coreceptor interface and predicted to interact with the CXCR4 N-terminus, was found to be critical for efficient CXCR4-mediated MDM entry of divergent CXCR4-using Envs. Together, the results of our study provide novel insights into alternative mechanisms of Env-coreceptor engagement that are associated with efficient CCR5- and CXCR4-mediated HIV-1 entry into macrophages.",
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Cashin, K, Roche, M, Sterjovski, J, Ellett, A, Gray, LR, Cunningham, A, Ramsland, P, Churchill, M & Gorry, P 2011, 'Alternative coreceptor requirements for efficient CCR5- and CXCR4-mediated HIV-1 entry into macrophages', Journal of Virology, vol. 85, no. 20, pp. 10699 - 10709. https://doi.org/10.1128/JVI.05510-11

Alternative coreceptor requirements for efficient CCR5- and CXCR4-mediated HIV-1 entry into macrophages. / Cashin, Kieran; Roche, Michael; Sterjovski, Jasminka; Ellett, Anne; Gray, Lachlan Robert; Cunningham, Anthony; Ramsland, Paul; Churchill, Melissa; Gorry, Paul.

In: Journal of Virology, Vol. 85, No. 20, 2011, p. 10699 - 10709.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Roche, Michael

AU - Sterjovski, Jasminka

AU - Ellett, Anne

AU - Gray, Lachlan Robert

AU - Cunningham, Anthony

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AU - Churchill, Melissa

AU - Gorry, Paul

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