新型冠状病毒PLpro负调控DDX3诱导的β干扰素抗病毒免疫通路
SARS-CoV-2 PLpro negatively regulates interferon-β immune pathway induced by DDX3
王明宇 1陈晓娟 2孟欢 3邵丽婷 1焦园园 1李文倩 1李萍 1邢雅玲1
作者信息
- 1. 军事科学院军事医学研究院生物信息中心,北京 100850
- 2. 军事科学院军事医学研究院辐射医学研究所,北京 100850
- 3. 首都医科大学附属地坛医院检验科,北京 100015
- 折叠
摘要
目的 发现严重急性呼吸综合征冠状病毒2(SARS-CoV-2)木瓜样蛋白酶(PLpro)的宿主互作分子,探索其生物学意义.方法 邻近蛋白标记结合质谱分析筛选宿主互作分子DEAD-box解旋酶3(DDX3);免疫荧光法分析PLpro与DDX3的胞内共定位;免疫共沉淀法分析PLpro与DDX3的相互作用,以及PLpro对DDX3与IκB激酶ε(IKKe)和TANK结合激酶1(TBK1)、DDX3与线粒体抗病毒信号蛋白(MAVS)互作的影响;荧光素酶报告基因法检测PLpro对β干扰素(IFN-β)通路的影响和对底物的酶切效率.结果 DDX3能够与PLpro发生细胞内共定位和相互作用;PLpro可能抑制DDX3-MAVS复合体形成,抑制DDX3-IKKε-TBK1之间的相互作用,负调控Ⅰ型干扰素通路;DDX3过表达情况下,PLpro/PLP-TM对底物位点的切割效率显著升高,而DDX3表达降低时,切割效率则显著降低.结论 DDX3可能是PLpro的宿主相互作用分子之一;PLpro负调控DDX3活化的IFN-β表达,为病毒复制提供有利的免疫环境,提升蛋白酶切割活性,共同促进病毒复制.
Abstract
Objective To discover the host factor interacting with severe acute respiratory syndrome coronavirus-2(SARS-CoV-2)papain-like protease(PLpro)and explore the potential mechanism.Methods The second-generation proximity-dependent biotin identification(BioID2)approach combined with mass spectrometry analysis was used to search for the potential host factors.Immunofluorescence and co-immunoprecipitation(Co-IP)assay were used to verify the interactions between DEAD-box helicase 3(DDX3)and PLpro.The influence of PLpro on DDX3-inhibitor of kappa B kinase ε(IKKε)-TANK-binding kinase 1(TBK1)and DDX3-mitochondrial antiviral signaling protein(MAVS)complexes was also investigated by Co-IP.The effect of PLpro on interferon-β(IFN-β)immune pathway and the protease activity on substrates were studied via luciferase activity assay.Results DDX3 could co-locate and interact with PLpro intracellularly.PLpro might possibly inhibit both the formation of DDX3-MAVS complex and the interactions between DDX3-IKK-ε-TBK1.PLpro could negatively regulate type Ⅰ interferon pathway.Overexpression of DDX3 could lead to a significant increase in the cleavage activity of PLpro/PLP-TM that might be significantly decreased in case of inventions with DDX3 expressions.Conclusion DDX3 may be one of the host factors that interact with SARS-CoV-2 PLpro.PLpro negatively regulates IFN-β immune pathway induced by DDX3,which may provide a favorable immune environment for virus replication.
关键词
严重急性呼吸综合征冠状病毒2/木瓜样蛋白酶/DEAD-box解旋酶3/抗病毒天然免疫Key words
severe acute respiratory syndrome coronavirus-2/papain-like protease/DEAD-box helicase 3/antiviral innate immunity引用本文复制引用
基金项目
国家自然科学基金面上项目(82072285)
出版年
2024
国家科技期刊平台
NSTL
万方数据