Dynamic conformational changes in the rhesus TRIM5α dimer dictate the potency of HIV-1 restriction.

Dynamic conformational changes in the rhesus TRIM5α dimer dictate the potency of HIV-1 restriction.
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恒河猴 TRIM5α 二聚体的动态构象变化决定了 HIV-1 限制的效力。

DOI:
10.1016/j.virol.2016.10.003
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Campbell,EdwardM
Campbell,EdwardM
中科院分区:
医学3区
文献类型:
--
作者:
Lamichhane,Rajan;Mukherjee,Santanu;Smolin,Nikolai;Pauszek3rd,RaymondF;Bradley,Margret;Sastri,Jaya;Robia,SethL;Millar,David;Campbell,EdwardM

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来自恒河猴的TRIM5α蛋白(rhTRIM5α)通过一种涉及病毒核心流产解体的机制介导对HIV-1感染的有效抑制。我们已经证明,位于SPRY结构域和coil - coil结构域之间的link2 (L2)区域内的α -螺旋元件会影响限制的效力。在这里,我们利用单分子FRET分析揭示了TRIM5α二聚体的L2区域发生了动态构象变化,导致L2区域相对位移25埃。对L2区限制性限制增强或消除突变的分析表明,限制性限制缺陷突变体不能经历动态构象变化,也不能在L2区形成紧凑的α -螺旋构象。这些数据提出了一个模型,其中L2区域的构象变化介导CA结合的SPRY结构域的位移,从而在限制期间诱导组装衣壳的不稳定。
The TRIM5α protein from rhesus macaques (rhTRIM5α) mediates a potent inhibition of HIV-1 infection via a mechanism that involves the abortive disassembly of the viral core. We have demonstrated that alpha-helical elements within the Linker 2 (L2) region, which lies between the SPRY domain and the Coiled-Coil domain, influence the potency of restriction. Here, we utilize single-molecule FRET analysis to reveal that the L2 region of the TRIM5α dimer undergoes dynamic conformational changes, which results in the displacement of L2 regions by 25 angstroms relative to each other. Analysis of restriction enhancing or abrogating mutations in the L2 region reveal that restriction defective mutants are unable to undergo dynamic conformational changes and do not assume compact, alpha-helical conformations in the L2 region. These data suggest a model in which conformational changes in the L2 region mediate displacement of CA bound SPRY domains to induce the destabilization of assembled capsid during restriction.
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