关键词: N-N oligomer N-P complex Siniperca chuatsi rhabdovirus (SCRV) eukaryotic translation elongation factor 1 alpha (eEF1A) matrix protein (M) nucleoprotein (N) rhabdovirus ubiquitin-proteasome degradation

Mesh : Animals Fishes Peptide Elongation Factor 1 / genetics metabolism Rhabdoviridae / physiology Rhabdoviridae Infections / metabolism veterinary Viral Proteins / genetics metabolism Fish Proteins / metabolism Fish Diseases / metabolism

来  源:   DOI:10.1128/jvi.01226-23   PDF(Pubmed)

Abstract:
OBJECTIVE: Although a virus can regulate many cellular responses to facilitate its replication by interacting with host proteins, the host can also restrict virus infection through these interactions. In the present study, we showed that the host eukaryotic translation elongation factor 1 alpha (eEF1A), an essential protein in the translation machinery, interacted with two proteins of a fish rhabdovirus, Siniperca chuatsi rhabdovirus (SCRV), and inhibited virus infection via two different mechanisms: (i) inhibiting the formation of crucial viral protein complexes required for virus transcription and replication and (ii) promoting the ubiquitin-proteasome degradation of viral protein. We also revealed the functional regions of eEF1A that are involved in the two processes. Such a host protein inhibiting a rhabdovirus infection in two ways is rarely reported. These findings provided new information for the interactions between host and fish rhabdovirus.
摘要:
弹状病毒是单链的,具有广泛宿主范围的负义RNA病毒,其中一些是重要的病原体。与感染哺乳动物的弹状病毒相比,与水生弹状病毒感染有关的宿主因素在很大程度上仍然未知。在本研究中,我们报道了宿主真核翻译延伸因子1α(eEF1A)在Sinipercachuatsi弹状病毒感染中的作用(SCRV,Siniperhavirus属),是普通话鱼类的重要病原体。从基于SCRV核蛋白(N)的亲和纯化蛋白中鉴定eEF1A。进一步的蛋白质相互作用和突变实验证明,eEF1A不仅与N蛋白相互作用,而且与病毒基质蛋白(M)相互作用,依赖于eEF1A的N端。SCRV感染和N或M的过表达都刺激了eEF1A基因的启动子活性,因此,上调了它的表达,而上调的eEF1A抑制SCRV基因组的转录。机械上,eEF1A损害了N和磷蛋白(P)之间的相互作用,或者N和N,这对弹状病毒的有效转录和复制很重要。同时,eEF1A促进M蛋白的泛素-蛋白酶体降解,它依赖于泛素的赖氨酸48(K48)。此外,我们发现M蛋白的泛素化降解依赖于eEF1A的C端结构域,但是抑制N-P或N-N相互作用需要其全长。总的来说,这些结果揭示了eEF1A用于抵抗鱼弹状病毒的两种不同机制,这为eEF1A在弹状病毒感染中的作用提供了新的见解,并为抗病毒研究提供了新的信息。重要性尽管病毒可以通过与宿主蛋白相互作用来调节许多细胞反应以促进其复制,宿主也可以通过这些相互作用限制病毒感染。在本研究中,我们表明,宿主真核翻译延伸因子1α(eEF1A),翻译机制中的一种重要蛋白质,与鱼弹状病毒的两种蛋白质相互作用,Sinipercachuatsi弹状病毒(SCRV),并通过两种不同的机制抑制病毒感染:(i)抑制病毒转录和复制所需的关键病毒蛋白复合物的形成,以及(ii)促进病毒蛋白的泛素-蛋白酶体降解。我们还揭示了这两个过程中涉及的eEF1A的功能区域。很少报道这种宿主蛋白以两种方式抑制弹状病毒感染。这些发现为宿主和鱼类弹状病毒之间的相互作用提供了新的信息。
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