由TBK1对基碳化合物受体相互作用蛋白的酸化会负面调节IRF7和I型干扰素反应
Sarah A Kazzaz1, Kashif A Shaikh2, Jesse White2
1Department of Microbiology and Immunology, Penn State College of Medicine, Hershey, Pennsylvania, USA; Medical Scientist Training Program, Penn State College of Medicine, Hershey, Pennsylvania, USA.
The Journal of biological chemistry
|December 3, 2023
概括
激酶TBK1在Thr40酸化AIP,控制其与IRF7.7的相互作用. 这种酸化作为一个开关,调节I型干扰素的产生和抗病毒免疫力.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 分子生物学分子生物学
背景情况:
- 天生的抗病毒免疫依赖于RIG-I类受体检测病毒RNA,触发I型干扰素 (IFN) 生产.
- 基碳化合物受体相互作用蛋白 (AIP) 通过隔离IRF7来负面调节这种反应,防止IFN的产生.
- 对AIP抑制IRF7的监管机制尚不清楚.
研究的目的:
- 阐明控制AIP作为先天抗病毒反应的负调节器功能的调节机制.
- 确定参与调节AIP与IRF7.7相互作用的特定部位和激酶.
主要方法:
- 研究了TBK1激酶在化AIP中的作用.
- 使用相仿 (T40E) 和素 (T40A) AIP突变来评估Thr40酸化的功能.
- 评估了AIP稳定性,IRF7结合,IRF7核转移,I型IFN产生和病毒复制,以应对AIP修改.
主要成果:
- TBK1主要在Thr40酸化AIP,调节AIP稳定性和IRF7相互作用.
- 模仿突变物AIP T40E显示降解增加,增强IRF7结合,阻断IRF7核转位,减少IFN产生,并增加病毒复制.
- 素突变AIP T40A表现出IRF7结合功能受损,导致IFN反应升高和病毒复制减少.
结论:
- 在Thr40处AIP的TBK1-介导酸化起到分子开关的作用,调节AIP与IRF7.7的相互作用.
- 这种酸化事件对于控制I型IFN的产生和在病毒感染期间维持免疫平衡至关重要.
- 针对TBK1-AIP-IRF7轴为治疗病毒感染和炎症疾病提供了潜在的治疗策略.
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