Tetherin inhibits HIV-1 release by directly tethering virions to cells.

Tetherin inhibits HIV-1 release by directly tethering virions to cells.
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DOI:
10.1016/j.cell.2009.08.039
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发表时间:
2009-10-30
期刊:
影响因子:
64.5
通讯作者:
Bieniasz PD
Bieniasz PD
中科院分区:
生物学1区
文献类型:
--
作者:
Perez-Caballero D;Zang T;Ebrahimi A;McNatt MW;Gregory DA;Johnson MC;Bieniasz PD

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Tetherin是一种干扰素诱导的蛋白质,其表达阻断HIV-1和其他包膜病毒颗粒的释放。拴系蛋白发挥作用的潜在机制,以及它是否直接或间接导致病毒体保留尚不清楚。在这里,我们阐明了拴蛋白发挥其抗病毒活性的机制。我们证明,通过突变分析和结构域置换实验,连接蛋白的配置,而不是主要的序列是至关重要的抗病毒活性。这些发现允许设计一种完全人工的蛋白质,与天然的tetherin缺乏序列同源性,但却模仿其抗病毒活性。我们进一步表明,拴蛋白被纳入HIV-1颗粒作为一个平行的同型二聚体使用其两个膜锚。这些结果表明,拴系蛋白的功能自主和直接,和病毒体包膜的一个或两个拴系蛋白的膜锚的渗透是必要的,可能是足够的,拴系包膜病毒颗粒芽通过质膜。
Tetherin is an interferon-induced protein whose expression blocks the release of HIV-1 and other enveloped viral particles. The underlying mechanism by which tetherin functions, and whether it directly or indirectly causes virion retention are unknown. Here, we elucidate the mechanism by which tetherin exerts its antiviral activity. We demonstrate, through mutational analyses and domain replacement experiments, that tetherin configuration rather than primary sequence is critical for antiviral activity. These findings allowed the design of a completely artificial protein, lacking sequence homology with native tetherin, that nevertheless mimicked its antiviral activity. We further show that tetherin is incorporated into HIV-1 particles as a parallel homodimer using either of its two membrane anchors. These results indicate that tetherin functions autonomously and directly, and that infiltration of virion envelopes by one or both of tetherin's membrane anchors is necessary, and likely sufficient, to tether enveloped virus particles that bud through plasma membrane.
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