细胞和组织中氧化条件下的蛋白质的成像和概况,通过对氧化物有反应的标记
Hao Zhu1, Tomonori Tamura1,2, Alma Fujisawa1
1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Journal of the American Chemical Society
|August 22, 2020
概括
研究人员开发了一种新型化学工具Hyp-L,用于可视化和识别细胞和组织中受过氧化 (H2O2) 等反应性氧物 (ROS) 影响的蛋白质,从而揭示了巨自细胞中的H2O2积累.
科学领域:
- 生物化学
- 细胞生物学
- 化学生物学
背景情况:
- 反应性氧物种 (ROS),包括过氧化 (H2O2),在生理度下作为氧化应激和信号分子的破坏性剂发挥双重作用.
- 了解ROS的精确生物功能和局部化对于阐明细胞过程和疾病机制至关重要.
研究的目的:
- 开发一种用于可视化和定量化生物系统中ROS修饰蛋白质的新型化学工具.
- 用高空间分辨率识别ROS生成和积累的细胞部位.
- 研究ROS在特定细胞环境中的作用,例如激活的巨细胞和脑组织.
主要方法:
- 在氧化条件下选择性标记蛋白质的H2O2响应蛋白质标记试剂 (Hyp-L) 的开发.
- 使用光成像可视化活细胞和组织中的ROS介导蛋白质修饰.
- 采用条件蛋白质学工作流程来识别和分析标记为Hyp-L的蛋白质.
- 整合成像和蛋白质组学数据进行亚细胞局部化分析.
主要成果:
- 在活细胞和组织中,Hyp-L试剂成功标记了对H2O2的反应,在固定后,信号持续用于免疫染相容性.
- 蛋白质组分析确定了ROS修饰的蛋白质,使得ROS生成和积累地点的映射成为可能.
- 首次证明自细胞在激活的巨细胞中富含H2O2.
- 使用Hyp-L和条件蛋白质学揭示了小鼠大脑组织中线粒体内的氧化应激.
结论:
- Hyp-L是通过光成像和条件蛋白质学研究ROS生物学的一种多功能化学工具.
- 这项研究为ROS的亚细胞局部化提供了新的见解,特别是在激活的巨细胞中识别了自胞体作为H2O2丰富的隔间.
- 在小鼠大脑组织中的Hyp-L应用突出了其在复杂生物系统中的氧化应激研究中的有用性.
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