通过分子动力学模拟,解开循环腺-氨基单酸盐 (cAIMP) 对STING的结合模式
Meiting Wang1,2, Baoyi Fan1, Wenfeng Lu1
1School of Medical Engineering & Henan International Joint Laboratory of Neural Information Analysis and Drug Intelligent Design, Xinxiang Medical University, Xinxiang 453003, China.
循环氨酸-氨酸单酸相似物 (cAIMPs) 将人类的STING (hSTING) 结合到U形形状,稳定了蛋白质. 分子动力学揭示了关键的相互作用和对免疫反应中STING激活至关重要的结构变化.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 计算化学的计算化学
背景情况:
- 干扰素基因刺激器 (STING) 是先天免疫和抗瘤反应中的关键蛋白质.
- 了解循环二核酸 (CDN) 配体如何激活STING对于开发免疫疗法至关重要,但动态激活过程仍然不清楚.
研究的目的:
- 研究人类STING (hSTING) 与新型循环腺-氨酸单酸相似物 (cAIMPs) 相互作用时的结合模式和形状动态.
- 阐明控制cAIMP结合的分子相互作用及其对hSTING构造的影响.
主要方法:
- 采用全原子分子动力学模拟来分析hSTING与四种cAIMP类似物之间的相互作用,以及2',3'-cGMP-AMP.
- 详细分析hSTING蛋白内非共价相互作用,疏水相互作用和构造变化.
主要成果:
- cAIMPs在hSTING口袋中采用U形结合形态,形成广泛的非共价相互作用,特别是与残留物Tyr167,Arg238,Thr263和Thr267.
- 疏水性相互作用对联体受体复合体的稳定性有显著的贡献.
- 某些cAIMP配体的结合诱导了hSTING从开放状态到封闭状态的构造转变.
结论:
- 该研究澄清了cAIMPs与hSTING的结合机制,突出了特定的氨基酸残留物和关键的结合亲和力相互作用类型.
- 观察到的形状变化表明,由cAIMP结合调节的STING激活机制.
- 这些发现为治疗应用的STING激动剂的合理设计提供了宝贵的见解.
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