BRISC-SHMT2组件的代谢控制调节免疫信号
Miriam Walden1, Lei Tian2, Rebecca L Ross3
1Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, UK.
Nature
|May 31, 2019
概括
代谢物调节炎症信号. 这项研究揭示了不活跃的Serine hydroxymethyltransferase 2 (SHMT2) 双重酶如何抑制BRCC36异酶复合体 (BRISC),影响细胞因子反应和I型干扰素信号传递.
科学领域:
- 生物化学
- 分子生物学
- 免疫学
背景情况:
- 血清甲基转移酶2 (SHMT2) 对于单碳代谢至关重要,使用酸-5'-酸盐 (PLP) 作为辅助因子.
- SHMT2的二度形式是不活跃的,而PLP结合则稳定其活跃的四度形式.
- SHMT2与BRCC36异酶复合体 (BRISC) 相互作用,影响炎症细胞因子信号传递,但机制尚不清楚.
研究的目的:
- 阐明BRISC-SHMT2相互作用的结构基础.
- 了解SHMT2如何调节BRISC活动和炎症信号.
- 研究PLP在调节这种相互作用和下游信号中的作用.
主要方法:
- 用冷电子显微镜 (cryo-EM) 确定人类BRISC-SHMT2复合物的结构.
- 生物化学测定以评估二化酶活动的抑制.
- 通过位点定向的突变发生来破坏SHMT2与BRISC的结合.
- 对I型干扰素信号的分析.
主要成果:
- 冷-EM结构显示SHMT2在固体上阻断BRCC36活性部位,从而抑制duebiquitylase的活性.
- 只有不活性的SHMT2二聚体,而不是与PLP结合的四聚体,会结合并抑制BRISC.
- 破坏BRISC-SHMT2结合的突变影响了I型干扰素的信号传递.
- 细胞内PLP水平可以调节BRISC-SHMT2相互作用和炎症反应.
结论:
- 通过固体阻碍,SHMT2直接抑制了BRISC二化酶的活性.
- 代谢物水平 (PLP) 动态调节SHMT2- BRISC相互作用,控制炎症信号.
- 这项研究揭示了一种新的机制,通过代谢物控制的酶抑制,将代谢状态与免疫反应调节联系起来.
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