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The Cap-Snatching SFTSV Endonuclease Domain Is an Antiviral Target.
Cell Reports ( IF 7.5 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.celrep.2019.12.020
Wenjie Wang 1 , Woo-Jin Shin 2 , Bojie Zhang 3 , Younho Choi 2 , Ji-Seung Yoo 2 , Maxwell I Zimmerman 4 , Thomas E Frederick 4 , Gregory R Bowman 4 , Michael L Gross 3 , Daisy W Leung 5 , Jae U Jung 2 , Gaya K Amarasinghe 1
Affiliation  

Severe fever with thrombocytopenia syndrome virus (SFTSV) is a tick-borne virus with 12%-30% case mortality rates and is related to the Heartland virus (HRTV) identified in the United States. Together, SFTSV and HRTV are emerging segmented, negative-sense RNA viral (sNSV) pathogens with potential global health impact. Here, we characterize the amino-terminal cap-snatching endonuclease domain of SFTSV polymerase (L) and solve a 2.4-Å X-ray crystal structure. While the overall structure is similar to those of other cap-snatching sNSV endonucleases, differences near the C terminus of the SFTSV endonuclease suggest divergence in regulation. Influenza virus endonuclease inhibitors, including the US Food and Drug Administration (FDA) approved Baloxavir (BXA), inhibit the endonuclease activity in in vitro enzymatic assays and in cell-based studies. BXA displays potent activity with a half maximal inhibitory concentration (IC50) of ∼100 nM in enzyme inhibition and an EC50 value of ∼250 nM against SFTSV and HRTV in plaque assays. Together, our data support sNSV endonucleases as an antiviral target.

中文翻译:


抢帽 SFTSV 核酸内切酶结构域是抗病毒靶标。



严重发热伴血小板减少综合征病毒 (SFTSV) 是一种蜱传病毒,病例死亡率为 12%-30%,与美国发现的哈特兰病毒 (HRTV) 相关。 SFTSV 和 HRTV 是新兴的分段负义 RNA 病毒 (sNSV) 病原体,具有潜在的全球健康影响。在这里,我们表征了 SFTSV 聚合酶 (L) 的氨基末端抢帽核酸内切酶结构域,并解析了 2.4-Å X 射线晶体结构。虽然整体结构与其他抢帽 sNSV 核酸内切酶相似,但 SFTSV 核酸内切酶 C 末端附近的差异表明调控方面存在差异。流感病毒核酸内切酶抑制剂,包括美国食品和药物管理局 (FDA) 批准的巴洛沙韦 (BXA),可在体外酶测定和细胞研究中抑制核酸内切酶活性。 BXA 在酶抑制中表现出有效的活性,半数抑制浓度 (IC50) 约为 100 nM,在空斑测定中针对 SFTSV 和 HRTV 的 EC50 值为 ∼250 nM。总之,我们的数据支持 sNSV 核酸内切酶作为抗病毒靶点。
更新日期:2020-01-07
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