Cryo-EM structure of the Rous sarcoma virus octameric cleaved synaptic complex intasome.

Cryo-EM structure of the Rous sarcoma virus octameric cleaved synaptic complex intasome.
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劳斯肉瘤病毒八聚体裂解突触复合体的冷冻-EM结构。

DOI:
10.1038/s42003-021-01855-2
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发表时间:
2021-03-12
影响因子:
5.9
通讯作者:
Grandgenett DP
Grandgenett DP
中科院分区:
生物学2区
文献类型:
--
作者:
Pandey KK;Bera S;Shi K;Rau MJ;Oleru AV;Fitzpatrick JAJ;Engelman AN;Aihara H;Grandgenett DP

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尽管有保守的催化整合机制,但由整合酶(IN)和病毒DNA组成的逆转录病毒整合体具有不同的结构,具有不同数量的IN亚基。为了研究整合体的组装机制,我们采用了劳斯肉瘤病毒(RSV)IN二聚体,其在向成熟的八聚体整合体的转运中组装前体四聚体结构。我们使用单粒子冷冻电子显微镜确定了由HIV-1 IN链转移抑制剂稳定的RSV八聚体整合体的结构。该结构揭示了两个非催化性远端IN二聚体的显著灵活性,沿着出现了先前未识别的保守整合体核心的运动,表明中间体之间的有序构象转变对于捕获靶DNA可能是重要的。IN C-末端结构域内的单个氨基酸取代影响整合体组装和体外功能以及假型RSV病毒粒子的感染性。出乎意料的是,尽管在体外调节四聚体到八聚体形式的转变,IN的17个C-末端氨基酸被病毒感染抑制。我们推测该区域可能调节高度灵活的远端IN二聚体与整合体核心的结合以形成八聚体复合物。我们的研究揭示了RSV整合体组装的关键步骤。Pandey、Bera、Shi等人报道了由HIV-1整合酶链转移抑制剂稳定的Rous肉瘤病毒八聚体整合体复合物的冷冻电子显微镜结构。这种新的结构突出了远端整合酶亚基的内在灵活性,并表明在组装过程中保守的整合体核心内发生有序的构象转变。
Despite conserved catalytic integration mechanisms, retroviral intasomes composed of integrase (IN) and viral DNA possess diverse structures with variable numbers of IN subunits. To investigate intasome assembly mechanisms, we employed the Rous sarcoma virus (RSV) IN dimer that assembles a precursor tetrameric structure in transit to the mature octameric intasome. We determined the structure of RSV octameric intasome stabilized by a HIV-1 IN strand transfer inhibitor using single particle cryo-electron microscopy. The structure revealed significant flexibility of the two non-catalytic distal IN dimers along with previously unrecognized movement of the conserved intasome core, suggesting ordered conformational transitions between intermediates that may be important to capture the target DNA. Single amino acid substitutions within the IN C-terminal domain affected intasome assembly and function in vitro and infectivity of pseudotyped RSV virions. Unexpectedly, 17 C-terminal amino acids of IN were dispensable for virus infection despite regulating the transition of the tetrameric intasome to the octameric form in vitro. We speculate that this region may regulate the binding of highly flexible distal IN dimers to the intasome core to form the octameric complex. Our studies reveal key steps in the assembly of RSV intasomes. Pandey, Bera, Shi et al. report the cryo-electron microscopy structure of the Rous sarcoma virus octameric intasome complex stabilized by a HIV-1 integrase strand transfer inhibitor. This new structure highlights the intrinsic flexibility of the distal integrase subunits and suggests that ordered conformational transitions occur within the conserved intasome core during the assembly process.
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