Link between Primate Lentiviral Coreceptor Usage and Nef Function

Link between Primate Lentiviral Coreceptor Usage and Nef Function
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灵长类慢病毒辅助受体的使用与 Nef 功能之间的联系

DOI:
10.1016/j.celrep.2013.10.028
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发表时间:
2013
期刊:
影响因子:
8.8
通讯作者:
Silvestri
Silvestri
中科院分区:
生物学1区
文献类型:
--
作者:
Schmökel;Shabir;Hangxing;Matthias;Silvestri

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猴免疫缺陷病毒(SIVsmm)感染白眉猴(Cercocebus atys)的特征在于稳定的CD 4 +T细胞计数,尽管血浆中存在高水平的CCR 5嗜性病毒。然而,在极少数情况下,SIVsmm获得CXCR 4辅助受体向性并导致严重的CD 4 +T细胞耗竭,尽管没有免疫缺陷的临床体征。在这里,我们表明,CXCR 4-tropic SIVsmm株失去了下调TCR-CD 3的能力,通过演变不寻常的Nef突变,最初减少(I132 V),随后破坏(I123 L和L146 F)与CD 3 β链的相互作用。Env和Nef功能的这种共同进化表明,CD 3下调有利于活化的CCR 5+记忆T细胞中的病毒复制,但不利于尚未经历TCR-CD 3介导的刺激的静息幼稚CXCR 4 +T细胞。这可能解释了为什么通常缺乏CD 3下调功能的HIV-1通常会切换到CXCR 4使用,而这对于保留这种Nef活性的SIV毒株来说是极其罕见的。
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.
体内对 CC 和 CXC 趋化因子辅助受体混用的适应与 HIV-1 疾病进展相关
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