对于T细胞免疫球蛋白和蛋白3以及Toxascaris leonina galectin复合物的结构基础
Chang Woo Han1, Mi Suk Jeong1, Han Na Lee2
1Institute of Systems Biology, Pusan National University, Jangjeon-dong, Geumjeong-gu, Busan, 46241, Republic of Korea.
Biochemical and biophysical research communications
|January 21, 2024
概括
结构上阐明了T细胞免疫球蛋白和粘素蛋白3 (Tim-3) 与Tl-gal,一个Galectin-9同源的相互作用. 这揭示了免疫反应调节的关键结合机制,可能针对炎症性疾病.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- T细胞免疫球蛋白和粘素蛋白3 (Tim-3) 负面调节T细胞的反应.
- 加勒-9与Tim-3结合,并调节T细胞的抑制.
- 来自Toxascaris leonina的Galectin-9同源Tl-gal提供了一个研究Tim-3相互作用的模型.
研究的目的:
- 为了确定Tim-3和Tl-gal之间的相互作用的结构基础.
- 描述Tim-3-Tl-gal复合物的生物化学和生物物理性质.
- 为了阐明Tim-3介导的免疫调节的分子机制.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 和X射线晶体学来确定复杂的结构.
- 进行了生物化学和生物物理测试以进行表征.
- 在分子水平上分析蛋白质-蛋白质相互作用.
主要成果:
- 结构显示Tl-gal的Ser46与人类Tim-3 (hTim-3) 的Asp25结合.
- 确定的结合部位与Tl-gal.的糖结合部位一致.
- 该综合体展示了四个Tl-gal分子与一种小鼠Tim-3 (mTim-3) 的包装.
结论:
- Tl-gal与hTim-3的结合方式为Tim-3-galectin-9相互作用机制提供了洞察力.
- 了解这种相互作用对于理解免疫反应调节至关重要.
- 蒂姆-3-Tl-gal复合体可能代表炎症性疾病的治疗点.
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