Macrophage-tropic HIV-1 variants from brain demonstrate alterations in the way gp120 engages both CD4 and CCR5

Salimi, H, Roche, M, Webb, N, Gray, L, Chikere, K, Sterjovski, J, Ellett, A, Wesselingh, S, Ramsland, P, Lee, B, Churchill, M and Gorry, P 2013, 'Macrophage-tropic HIV-1 variants from brain demonstrate alterations in the way gp120 engages both CD4 and CCR5', Journal of Leukocyte Biology, vol. 93, pp. 113-126.


Document type: Journal Article
Collection: Journal Articles

Title Macrophage-tropic HIV-1 variants from brain demonstrate alterations in the way gp120 engages both CD4 and CCR5
Author(s) Salimi, H
Roche, M
Webb, N
Gray, L
Chikere, K
Sterjovski, J
Ellett, A
Wesselingh, S
Ramsland, P
Lee, B
Churchill, M
Gorry, P
Year 2013
Journal name Journal of Leukocyte Biology
Volume number 93
Start page 113
End page 126
Total pages 14
Publisher Federation of American Societies for Experimental Biology
Abstract BR-derived HIV-1 strains have an exceptional ability to enter macrophages via mechanisms involving their gp120 Env that remain incompletely understood. Here, we used cell-based affinity-profiling methods and mathematical modeling to generate quantitative VERSA metrics that simultaneously measure Env-CD4 and Env- CCR5 interactions. These metrics were analyzed to distinguish the phenotypes of M-tropic and non-M-tropic CCR5-using HIV-1 variants derived from autopsy BRs and LNs, respectively. We show that highly M-tropic Env variants derived from brain can be defined by two distinct and simultaneously occurring phenotypes. First, BR-derived Envs demonstrated an enhanced ability to interact with CD4 compared with LN-derived Envs, permitting entry into cells expressing scant levels of CD4. Second, BR-derived Envs displayed an altered mechanism of engagement between CD4-bound gp120 and CCR5 occurring in tandem. With the use of epitope mapping, mutagenesis, and structural studies, we show that this altered mechanism is characterized by increased exposure of CD4-induced epitopes in gp120 and by a more critical interaction between BR-derived Envs and the CCR5 N-terminus, which was associated with the predicted presence of additional atomic contacts formed at the gp120-CCR5 N-terminus interface. Our results suggest that BR-derived HIV-1 variants with highly efficient macrophage entry adopt conformations in gp120 that simultaneously alter the way in which the Env interacts with CD4 and CCR5.
Subject Structural Biology (incl. Macromolecular Modelling)
Virology
Keyword(s) Affinofile
CNS
Env
Phenotype
Signature
DOI - identifier 10.1189/jlb.0612308
Copyright notice © Society for Leukocyte Biology
ISSN 0741-5400
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Citation counts: TR Web of Science Citation Count  Cited 25 times in Thomson Reuters Web of Science Article | Citations
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