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• W2082477478 abstract "Simian immunodeficiency virus (SIVsmm) infection of sooty mangabeys (Cercocebus atys) is characterized by stable CD4(+) T cell counts despite high plasma levels of CCR5-tropic viruses. However, in rare instances, SIVsmm acquires CXCR4 coreceptor tropism and causes severe CD4(+) T cell depletion, albeit without clinical signs of immunodeficiency. Here, we show that CXCR4-tropic SIVsmm strains lost their ability to downmodulate TCR-CD3 by evolving unusual Nef mutations that initially reduced (I132V) and subsequently disrupted (I123L and L146F) interaction with the CD3 ζ chain. This coevolution of Env and Nef function suggests that CD3 downmodulation is advantageous for viral replication in activated CCR5(+) memory T cells, but not in resting naive CXCR4(+) T cells that have not yet undergone TCR-CD3-mediated stimulation. This may explain why HIV-1, which generally lacks the CD3 downmodulation function, commonly switches to CXCR4 usage, whereas this is extremely rare for SIV strains that have retained this Nef activity." @default.
• W2082477478 created "2016-06-24" @default.
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• W2082477478 date "2013-11-01" @default.
• W2082477478 modified "2023-10-17" @default.
• W2082477478 title "Link between Primate Lentiviral Coreceptor Usage and Nef Function" @default.
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• W2082477478 doi "https://doi.org/10.1016/j.celrep.2013.10.028" @default.
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