SARS-CoV-2 ORF3a-Mediated NF-κB Activation Is Not Dependent on TRAF-Binding Sequence.

SARS-CoV-2 ORF3a-Mediated NF-κB Activation Is Not Dependent on TRAF-Binding Sequence.
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DOI:
10.3390/v15112229
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发表时间:
2023-11-08
期刊:
Viruses
影响因子:
--
通讯作者:
Xiao TS
Xiao TS
中科院分区:
其他
文献类型:
--
作者:
Busscher BM;Befekadu HB;Liu Z;Xiao TS

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严重急性呼吸道综合征冠状病毒2型(SARS-CoV-2)已导致2019冠状病毒病(COVID-19)全球大流行。过度炎症是严重COVID-19的标志,SARS-CoV-2基因组中编码的几种蛋白质能够刺激炎症途径。其中,辅助蛋白开放阅读框3a(ORF 3a)与COVID-19病理学有关。我们研究了ORF 3a与肿瘤坏死因子受体相关因子(TRAF)蛋白结合并诱导核因子κ B(NF-κB)活化的作用。X射线晶体学和荧光偏振分析揭示了ORF 3a N-末端肽和TRAFs之间的低亲和力结合,双荧光素酶分析证明了NF-κB被ORF 3a激活。尽管如此,在我们的试验中,ORF 3a中N-末端TRAF结合序列PIQAS的突变并没有显著降低NF-κB的活化。因此,我们的研究结果表明,SARS-CoV-2蛋白可能通过其他机制激活NF-κB。
Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) has caused a global pandemic of Coronavirus Disease 2019 (COVID-19). Excessive inflammation is a hallmark of severe COVID-19, and several proteins encoded in the SARS-CoV-2 genome are capable of stimulating inflammatory pathways. Among these, the accessory protein open reading frame 3a (ORF3a) has been implicated in COVID-19 pathology. Here we investigated the roles of ORF3a in binding to TNF receptor-associated factor (TRAF) proteins and inducing nuclear factor kappa B (NF-κB) activation. X-ray crystallography and a fluorescence polarization assay revealed low-affinity binding between an ORF3a N-terminal peptide and TRAFs, and a dual-luciferase assay demonstrated NF-κB activation by ORF3a. Nonetheless, mutation of the N-terminal TRAF-binding sequence PIQAS in ORF3a did not significantly diminish NF-κB activation in our assay. Our results thus suggest that the SARS-CoV-2 protein may activate NF-κB through alternative mechanisms.
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