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• W2010466904 abstract "APOBEC3 proteins inhibit HIV-1 replication in experimental systems and induce hypermutation in infected patients; however, the relative contributions of several APOBEC3 proteins to restriction of HIV-1 replication in the absence of the viral Vif protein in human primary CD4(+) T cells and macrophages are unknown. We observed significant inhibition of HIV-1Δvif produced in 293T cells in the presence of APOBEC3DE (A3DE), APOBEC3F (A3F), APOBEC3G (A3G), and APOBEC3H haplotype II (A3H HapII) but not APOBEC3B (A3B), APOBEC3C (A3C), or APOBEC3H haplotype I (A3H HapI). Our previous studies showed that Vif amino acids Y(40)RHHY(44) are important for inducing proteasomal degradation of A3G, whereas amino acids (14)DRMR(17) are important for degradation of A3F and A3DE. Here, we introduced substitution mutations of (40)YRHHY(44) and (14)DRMR(17) in replication-competent HIV-1 to generate vif mutants NL4-3 YRHHY>A5 and NL4-3 DRMR>A4 to compare the antiviral activity of A3G to the combined antiviral activity of A3F and A3DE in activated CD4(+) T cells and macrophages. During the first 15 days (round 1), in which multiple cycles of viral replication occurred, both the NL4-3 YRHHY>A5 and NL4-3 DRMR>A4 mutants replicated in activated CD4(+) T cells and macrophages, and only the NL4-3 YRHHY>A5 mutant showed a 2- to 4-day delay in replication compared to the wild type. During the subsequent 27 days (round 2) of cultures initiated with peak virus obtained from round 1, the NL4-3 YRHHY>A5 mutant exhibited a longer, 8- to 10-day delay and the NL4-3 DRMR>A4 mutant exhibited a 2- to 6-day delay in replication compared to the wild type. The NL4-3 YRHHY>A5 and NL4-3 DRMR>A4 mutant proviruses displayed G-to-A hypermutations primarily in GG and GA dinucleotides as expected of A3G- and A3F- or A3DE-mediated deamination, respectively. We conclude that A3G exerts a greater restriction effect on HIV-1 than A3F and A3DE." @default.
• W2010466904 created "2016-06-24" @default.
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• W2010466904 creator A5084222887 @default.
• W2010466904 date "2013-01-01" @default.
• W2010466904 modified "2023-10-16" @default.
• W2010466904 title "APOBEC3G Restricts HIV-1 to a Greater Extent than APOBEC3F and APOBEC3DE in Human Primary CD4 ⁺ T Cells and Macrophages" @default.
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• W2010466904 doi "https://doi.org/10.1128/jvi.00676-12" @default.
• W2010466904 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3536366" @default.
• W2010466904 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23097438" @default.
• W2010466904 hasPublicationYear "2013" @default.
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