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通过设计的膜连接体对T细胞受体的Allosteric抑制
Yujie Ye1, Shumpei Morita2, Justin J Chang3
1Department of Biochemistry & Cellular and Molecular Biology, University of Tennessee at Knoxville, Knoxville, United States.
eLife
|October 5, 2023
概括
研究人员开发了一种T细胞受体 (TCR) 的抑制剂,它与其跨膜域结合. 这种抑制剂抑制T细胞信号传递,支持全性TCR激活模型,并为自身免疫性疾病提供潜在的治疗方法.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- T细胞受体 (TCR) 激活T细胞以对抗病原体和癌症,但其精确的激活机制仍有争议.
- 性模型提出,pMHC结合会在TCR的跨膜 (TM) 域中触发构造变化,从而启动信号传递.
研究的目的:
- 通过为TCR创建特定的TM连接体来测试全性TCR激活模型.
- 研究一种新型TM连接体对TCR信号传递的影响及其潜在的治疗应用.
主要方法:
- 设计了一种TCR的抑制剂 (PITCR),能够插入细胞膜并与TCRTM域结合.
- 评估了PITCR对T细胞Lck酸化和近位信号级联的影响.
- 利用协同定位,在DIBMA纳米盘中的协同免疫沉和AlphaFold-Multimer预测来确认PITCR结合和相互作用地点.
主要成果:
- 设计的PITCR降低了T细胞中CD3ζ亚单元的Lck酸化.
- 在TCR激活后,PITCR显著抑制了TCR激活下游的近接信号级联.
- 实验和计算方法证实PITCR与TCRTM区域结合,与CD3ζ子单元相互作用并破坏全性TM束变化.
结论:
- 这些发现支持TCR激活的全模型,证明TM域相互作用调节信号传递.
- 皮特克有效抑制TCR信号传递,表明其作为治疗炎症,自身免疫疾病和移植排斥的治疗剂的潜力.
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