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腸病毒D68 VP3靶向干擾素調節因子7抑制I型干擾素應答

更新時間:2024-09-30  |  點擊率:819

20236月,中國天津大學生命科學學院;天津市生物大分子結構功能與應用重點實驗室研究所;天津大學環境科學與工程學院(School of Life Sciences, Tianjin University, Tianjin, China;Institute of Tianjin Key Laboratory of Function and Application of Biological Macromolecular Structures, Tianjin, China;School of Environmental Science and Engineering, Tianjin University, Tianjin, China) Jun Kang老師研究團隊在MICROBIOL SPECTR上發表論文:

Enterovirus D68 VP3 Targets the Interferon Regulatory Factor 7 To Inhibit Type I Interferon Response"


“腸病毒D68 VP3靶向干擾素調節因子7抑制I型干擾素應答"


Abstract

Enterovirus D68 (EV-D68) is a globally emerging pathogen causing severe respiratory illnesses mainly in children. The protease from EV-D68 could impair type I interferon (IFN-I) production. However, the role of the EV-D68 structural protein in antagonizing host antiviral responses remains largely unknown. We showed that the EV-D68 structural protein VP3 interacted with IFN regulatory factor 7 (IRF7), and this interaction suppressed the phosphorylation and nuclear translocation of IRF7 and then repressed the transcription of IFN. Furthermore, VP3 inhibited the TNF receptor associated factor 6 (TRAF6)-induced ubiquitination of IRF7 by competitive interaction with IRF7. IRF7Δ305-503 showed much weaker interaction ability to VP3, and VP3Δ41-50 performed weaker interaction ability with IRF7. The VP3 from enterovirus A71 (EV-A71) and coxsackievirus A16 (CV-A16) was also found to interact with the IRF7 protein. These results indicate that the enterovirus structural protein VP3 plays a pivotal role in subverting host innate immune responses and may be a potential target for antiviral drug research. IMPORTANCE EV-D68 is a globally emerging pathogen that causes severe respiratory illnesses. Here, we report that EV-D68 inhibits innate immune responses by targeting IRF7. Further investigations revealed that the structural protein VP3 inhibited the TRAF6-induced ubiquitination of IRF7 by competitive interaction with IRF7. These results indicate that the control of IRF7 by VP3 may be a mechanism by which EV-D68 represses IFN-I production.

摘要:

腸病毒D68 (EV-D68)是一種全球新發病原體,主要在兒童中引起嚴重呼吸道疾病。EV-D68的蛋白酶可以抑制I型干擾素(IFN-I)的產生。然而,EV-D68結構蛋白在拮抗宿主抗病毒反應中的作用在很大程度上仍然未知。研究人員發現EV-D68結構蛋白VP3與IFN調控因子7 (IRF7)相互作用,抑制IRF7的磷酸化和核易位,進而抑制IFN的轉錄。此外,VP3通過與IRF7的競爭性相互作用抑制TNF受體相關因子6 (TRAF6)誘導的IRF7泛素化。IRF7Δ305-503與VP3的互作能力弱得多,VP3Δ41-50與IRF7的互作能力弱得多。來自腸病毒A71 (EV-A71)和柯薩奇病毒A16 (CV-A16)的VP3也被發現與IRF7蛋白相互作用。這些結果表明,腸道病毒結構蛋白VP3在破壞宿主先天免疫應答中起著關鍵作用,可能是抗病du,藥物研究的潛在靶點。EV-D68是一種全球新發病原體,可引起嚴重呼吸道疾病。在這里,研究人員報道EV-D68通過靶向IRF7抑制先天免疫反應。進一步研究發現,結構蛋白VP3通過與IRF7的競爭相互作用抑制traf6誘導的IRF7泛素化。這些結果表明VP3對IRF7的控制可能是EV-D68抑制IFN-I產生的機制之一。


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