Neddylation Facilitates the Antiviral Response in Zebrafish

Neddylation Facilitates the Antiviral Response in Zebrafish
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Neddylation 促进斑马鱼的抗病毒反应

DOI:
10.3389/fimmu.2019.01432
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发表时间:
2019-06
影响因子:
7.3
通讯作者:
Wuhan Xiao
Wuhan Xiao
中科院分区:
医学2区
文献类型:
--
作者:
Guangqing YU;Xing Liu;Jinhua Tang;Chenxi Xu;Gang Ouyang;Wuhan Xiao

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类泛素化修饰是一种翻译后蛋白修饰,其中神经前体细胞表达的发育下调蛋白8 (NEDD8)与目标底物的赖氨酸残基共价结合。最有特征的类化修饰的主要底物是cullin-RING连接酶(CRLs)。此外,类化修饰还可以修饰非cullin蛋白,从而影响基因调控、细胞存活、器官发育和应激反应。然而,类化修饰在抗病毒先天免疫中的作用在很大程度上仍然未知。在这里,我们发现当NEDD8激活酶E1 (NAE)抑制剂MLN4924阻断类化修饰时,细胞和生物体的抗病毒反应受到抑制。此外,nedd8的破坏增加了斑马鱼对SVCV感染的敏感性。进一步的实验表明,阻断或沉默类化修饰可显著下调poly (I:C)刺激或SVCV感染后的关键抗病毒基因,但显著增加SVCV复制。Irf3和Irf7的类黄酮化很容易被检测到,但Mda5、Mavs和Tbk1没有。因此,我们的研究结果不仅证明了类化修饰促进了体外和体内的抗病毒反应,而且揭示了nedd8在抗病毒先天免疫中的新作用。
Neddylation is a type of post-translational protein modifications, in which neural precursor cell expressed developmentally downregulated protein 8 (NEDD8) is covalently conjugated to the lysine residues of target substrates. The best characterized principal substrates of neddylation are the cullin-RING ligases (CRLs). In addition, neddylation also modifies non-cullin proteins to affect gene regulation, cell survival, organ development, and stress response. However, the role of neddylation in antiviral innate immunity remain largely unknown. Here, we found that when neddylation was blocked by the NEDD8 activating enzyme E1 (NAE) inhibitor, MLN4924, the cellular and organismal antiviral response was suppressed. Moreover, the disruption of nedd8 increased the sensitivity of zebrafish to SVCV infection. Further assays indicated that blocking or silencing neddylation significantly downregulated key antiviral genes after poly (I:C) stimulation or SVCV infection, but dramatically increased SVCV replication. Neddylation of Irf3 and Irf7 was readily detected, but not of Mda5, Mavs, and Tbk1. Thus, our results not only demonstrated that neddylation facilitated the antiviral response in vitro and in vivo, but also revealed a novel role of nedd8 in antiviral innate immunity.
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