通过准跨膜领域的口袋来激活STING
Defen Lu1, Guijun Shang1, Jie Li2
1Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Nature
|April 7, 2022
概括
一种新型的小分子C53增强了STING蛋白的活性, 这一发现为开发疫苗和癌症免疫疗法提供了新的途径,
科学领域:
- 免疫学
- 分子生物学
- 结构生物学
背景情况:
- 干扰素基因刺激剂 (STING) 是一种关键的先天免疫适应蛋白.
- STING激活对抗DNA病毒和细菌至关重要, 在疫苗和癌症免疫治疗中具有潜在的应用.
- 由于cGAMP诱导的寡合体的不稳定性,对STING激活机制的理解受到限制.
研究的目的:
- 研究一种新的小分子激动剂,化合物53 (C53),用于激活STING.
- 阐明单独使用C53和cGAMP激活STING的结构基础.
- 探索C53在增强STING介导免疫力的治疗潜力.
主要方法:
- 用冷电子显微镜 (cryo-EM) 确定与C53和cGAMP结合的STING的结构.
- 用于分析STING寡合化和激活的生物化学测试.
- 用于评估由C53和cGAMP触发的免疫反应的功能研究.
主要成果:
- 一个稳定的,高阶的STING寡合体结构被解决,由侧面包装形成,具有卷曲的形状.
- C53与STING跨膜域内的神秘口袋结合,诱导构造变化和二次体间相互作用.
- 结合C53和cGAMP的治疗比单独使用任何一种配方激活显著更强.
结论:
- C53通过与cGAMP不同的机制激活STING,稳定STING寡合物.
- 结构洞察力揭示了C53与跨膜域的结合如何驱动STING的寡合化.
- 与C53和cGAMP的双重激活为增强基于STING的免疫疗法提供了一个有前途的策略.
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