对USP18的ISG15依赖性稳定是必要的,但不足以调节人类的I型干扰素信号
Andri Vasou1, Katie Nightingale2, Vladimíra Cetkovská1
1Biomedical Sciences Research Complex, School of Biology, University of St Andrews, St Andrews, UK.
European journal of immunology
|February 11, 2025
概括
干扰素 (IFN) 信号由IFN刺激的基因15 (ISG15) 严格控制. ISG15通过要求与USP18进行非共价相互作用来抑制I型IFN信号传输,以实现其调节功能.
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:
- I型干扰素 (IFN) 信号激活了数百个IFN刺激基因 (ISG) 来对抗病毒感染.
- 严格调节IFN信号传输对于预防自身炎症性疾病至关重要.
- 缺少ISG15会导致自身炎症性疾病,强调其调节作用.
研究的目的:
- 阐明ISG15调节I型IFN信号的精确机制.
- 调查ISG15与其目标USP18.5之间的相互作用.
主要方法:
- 针对ISG15的局部导向突变发生,以破坏特定相互作用.
- 对表达ISG15突变的细胞中USP18稳定和IFN信号的分析.
- 生物化学测定以评估ISG15-USP18结合亲和力.
主要成果:
- 取决于ISG15的USP18稳定需要涉及ISG15的三-123.3的疏水相互作用.
- 仅仅是USP18稳定对于IFN信号调节是不够的.
- 在USP18和ISG15的C端二甘氨酸基因组之间存在非共价相互作用,这对ISG15的调节功能至关重要.
结论:
- ISG15充当了I型IFN信号的抑制器,通过一种超出了简单USP18稳定范围的机制发送信号.
- 在IFN信号传输中,ISG15的dGlycine基因对调解USP18的调节功能至关重要.
- 了解ISG15-USP18相互作用为控制IFN介导的免疫反应和自身炎症条件提供了洞察力.
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