Cryo-EM structure of the deltaretroviral intasome in complex with the PP2A regulatory subunit B56γ.

Cryo-EM structure of the deltaretroviral intasome in complex with the PP2A regulatory subunit B56γ.
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DOI:
10.1038/s41467-020-18874-y
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发表时间:
2020-10-07
影响因子:
16.6
通讯作者:
Maertens GN
Maertens GN
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Barski MS;Minnell JJ;Hodakova Z;Pye VE;Nans A;Cherepanov P;Maertens GN

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人类T细胞嗜淋巴病毒1型(HTLV-1)是一种三角洲逆转录病毒,是最具致瘤性的病原体。大约2000万HTLV-1感染者中的许多人将患上严重的白血病或类似ALS的运动性疾病,除非有可用的治疗方法。确定感染的关键步骤是在逆转录病毒整合酶(IN)酶的催化下,将病毒遗传物质整合到宿主基因组中。在这里,我们使用X射线结晶学和单颗粒冷冻电子显微镜来确定装配在病毒DNA端并与其人类宿主因子蛋白磷酸酶2γA的B56 亚单位结合的功能性三角洲逆转录病毒IN的结构。该结构揭示了一个四聚体IN组装通过一个保守的短线性基序与磷酸酶的两个分子结合。深入了解三角洲逆转录病毒内切酶及其与宿主的相互作用对于了解感染者整合事件的模式至关重要,因此具有重要的临床意义。人T细胞嗜淋巴病毒1型(HTLV-1)是一种致病性的三角洲逆转录病毒。在这里,作者解析了三角洲逆转录病毒肠系体的低温EM结构,与人类宿主PP2A调节亚基形成了复合体。
Human T-cell lymphotropic virus type 1 (HTLV-1) is a deltaretrovirus and the most oncogenic pathogen. Many of the ~20 million HTLV-1 infected people will develop severe leukaemia or an ALS-like motor disease, unless a therapy becomes available. A key step in the establishment of infection is the integration of viral genetic material into the host genome, catalysed by the retroviral integrase (IN) enzyme. Here, we use X-ray crystallography and single-particle cryo-electron microscopy to determine the structure of the functional deltaretroviral IN assembled on viral DNA ends and bound to the B56γ subunit of its human host factor, protein phosphatase 2 A. The structure reveals a tetrameric IN assembly bound to two molecules of the phosphatase via a conserved short linear motif. Insight into the deltaretroviral intasome and its interaction with the host will be crucial for understanding the pattern of integration events in infected individuals and therefore bears important clinical implications. Human T-cell lymphotropic virus type 1 (HTLV-1) is a pathogenic deltaretrovirus. Here the authors resolve the cryo-EM structure of the deltaretroviral intasome in complex with the human host PP2A regulatory subunit.
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