泰米斯是SHP1的基质和基激活剂,在T细胞发育过程中发挥双重作用
Jiali Zhang1,2,3, Zhenzhou Jiang1, Xueyuan Zhang1,4
1School of Life Science and Technology, ShanghaiTech University, Shanghai, China.
Nature structural & molecular biology
|January 4, 2024
概括
蛋白质THEMIS通过Tyr34的酸化来调节,影响CD4 T细胞的发育. 这种酸化控制T细胞受体信号传递,但THEMIS在T细胞扩张中也有其他作用.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 在T细胞生物学中,THEMIS (甲状腺表达激酶) 的功能至关重要,但尚未完全理解.
- 之前的研究还没有完全阐明THEMIS活动及其在T细胞内的调节的精确机制.
研究的目的:
- 确定THEMIS的新基质和监管机制.
- 研究THEMIS酸化在Tyr34残留物在T细胞发育和信号传递中的作用.
主要方法:
- 利用依靠近距离的生物化方法 (PEPSI) 来识别THEMIS相互作用体和基板.
- 进行和突变基因分析和质谱分析,以分析THEMIS酸化.
- 生成并分析了THEMIS淘汰赛和淘汰赛老鼠模型 (THEMIS-/- 和 THEMISY34F/Y34F).
主要成果:
- 确定THEMIS是酸酶SHP1的基质,Tyr34的酸化由SHP1和激酶LCK相反调节.
- THEMISY34F/Y34F试验小鼠表现出减少的CD4胸细胞和成熟的CD4T细胞,与THEMIS-/-小鼠相似,但具有正常的CD8T细胞发育.
- 化THEMIS Tyr34充当全调节剂,稳定活性SHP1以负调节T细胞受体信号传递.
结论:
- 在Tyr34的THEMIS酸化对CD4 T细胞发育和T细胞受体信号调节至关重要.
- 泰米斯在T细胞成熟和扩张中表现出酸化依赖和独立的功能,正如CD4和CD8T细胞的差异调节所证明的那样.
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