TBK1-稳定ZNF268a招募SETD4以甲基化TBK1以提供高效的干扰素信号
Yi Liu1, Wei Yin1, Xianhuang Zeng2
1Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, Hubei, P.R. China.
The Journal of biological chemistry
|November 5, 2023
概括
人类指蛋白ZNF268a在病毒感染时稳定,增强抗病毒干扰素信号传递. 这种蛋白质将SETD4招募到TBK1中,促进复杂的组装和对病毒的宿主防御.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 病毒学 病毒学
背景情况:
- 干扰素信号传递对于抗病毒防御至关重要.
- 翻译后的修改调节了干扰素信号通路.
- 对于KRAB-指蛋白在抗病毒反应中的作用尚未完全理解.
研究的目的:
- 研究ZNF268a在病毒诱导的干扰素信号传递中的作用.
- 阐明ZNF268a调节干扰素信号传递的机制.
- 确定ZNF268a相互作用蛋白及其在抗病毒免疫中的功能.
主要方法:
- 西方涂抹检测蛋白质水平和酸化.
- 免疫沉以确定蛋白质相互作用.
- 位点定向突变发生,以研究特定氨基酸残留的作用.
主要成果:
- 细胞质ZNF268a被溶酶体降解,但在病毒感染时通过TBK1-介导的酸化在Serine 178.8稳定.
- 稳定的ZNF268a将SETD4招募到TBK1中,从而诱导TBK1在素607中的单甲基化,这对于TBK1复合体组装至关重要.
- ZNF268a酸化部位 (S178) 和TBK1甲基化部位 (K607) 显示了特定物种的保护,这表明它在灵长类动物的抗病毒防御中发挥了进化的作用.
结论:
- ZNF268a作为病毒诱导的干扰素信号传递的关键调节者.
- ZNF268a的稳定和随后的SETD4的招募是激活TBK1信号的关键事件.
- 这些发现揭示了ZNF268a和SETD4在先天性抗病毒免疫中的新机制,并突出了干扰素途径中潜在的物种特异性适应.
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