The nucleolar protein GLTSCR2 is required for efficient viral replication.

The nucleolar protein GLTSCR2 is required for efficient viral replication.
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DOI:
10.1038/srep36226
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发表时间:
2016-11-08
期刊:
影响因子:
4.6
通讯作者:
Wang XJ
Wang XJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang P;Meng W;Han SC;Li CC;Wang XJ;Wang XJ

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胶质瘤肿瘤抑制候选区域基因2蛋白(GLTSCR2)是一种核仁蛋白。在研究GLTSCR2在细胞对病毒感染的先天免疫应答中所起的作用时,我们发现GLTSCR2支持细胞中横纹肌病毒、副粘病毒和冠状病毒的病毒复制。病毒感染诱导GLTSCR2从细胞核转移到细胞质,使GLTSCR2减弱I型干扰素IFN-β并支持病毒复制。胞质GLTSCR2能够与视黄酸诱导基因I (RIG-I)和泛素特异性蛋白酶15 (USP15)相互作用,三者相互作用诱导USP15活性去除RIG-I的k63连锁泛素化,导致RIG-I和IFN-β的衰减。通过删除GLTSCR2的核输出序列(NES)来阻断GLTSCR2的细胞质易位,使其丧失了削弱IFN-β和支持病毒复制的能力。gltscr2介导的RIG-I和IFN-β的衰减导致宿主细胞对病毒感染的先天免疫反应减轻。我们的研究结果表明,GLTSCR2有助于有效的病毒复制,GLTSCR2应被视为治疗性控制病毒感染的潜在靶点。
Glioma tumor suppressor candidate region gene 2 protein (GLTSCR2) is a nucleolar protein. In the investigation of the role of GLTSCR2 that played in the cellular innate immune response to viral infection, we found GLTSCR2 supported viral replication of rhabdovirus, paramyxovirus, and coronavirus in cells. Viral infection induced translocation of GLTSCR2 from nucleus to cytoplasm that enabled GLTSCR2 to attenuate type I interferon IFN-β and support viral replication. Cytoplasmic GLTSCR2 was able to interact with retinoic acid-inducible gene I (RIG-I) and the ubiquitin-specific protease 15 (USP15), and the triple interaction induced USP15 activity to remove K63-linked ubiquitination of RIG-I, leading to attenuation of RIG-I and IFN-β. Blocking cytoplasmic translocation of GLTSCR2, by deletion of its nuclear export sequence (NES), abrogated its ability to attenuate IFN-β and support viral replication. GLTSCR2-mediated attenuation of RIG-I and IFN-β led to alleviation of host cell innate immune response to viral infection. Our findings suggested that GLTSCR2 contributed to efficient viral replication, and GLTSCR2 should be considered as a potential target for therapeutic control of viral infection.
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