工程 SIRPα 形状塑性,以揭示一个神秘的口袋,适合基于结构的药物设计
M Storder1, S Barelier1, F Cordier2,3
1CRCM, CNRS, Inserm, Institut Paoli-Calmettes, Aix-Marseille Univ, Marseille, France.
bioRxiv : the preprint server for biology
|January 7, 2026
概括
研究人员在SIRPα中发现了一个新的可用药的口袋,这是癌症免疫治疗的关键目标. 这个神秘的口袋.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- 信号调节蛋白α (SIRPα) -CD47相互作用是瘤利用免疫规避的关键免疫检查点.
- 针对这个检查点的现有抗体疗法面临着挑战,因为平面结合接口限制了小分子抑制剂的发展.
研究的目的:
- 为了在SIRPα中确定用于小分子抑制剂开发的新药可用部位.
- 描述控制访问SIRPα中新发现的加密口袋的机制.
主要方法:
- 基于结构的碎片选使用X射线晶体学.
- 核磁共振光谱,分子动力学模拟和生物物理分析.
- 局部定向的突变发生,以设计SIRPα变体.
主要成果:
- 在SIRPα D1域中发现了一种新型的,可用药的加密口袋 (WYF口袋).
- 鉴定Gln52作为一个门卫残留物,通过构造平衡控制口袋的可访问性.
- 改造的SIRPα突变体表现出改变的CD47结合亲和力和增强的小分子碎片结合.
结论:
- SIRPα具有内在的形状可塑性,使其能够准神秘的口袋.
- 一个"灵活性抑制"的策略,捕捉一个非约束性构造,被验证用于开发全抑制剂.
- 这种方法提供了针对SIRPα-CD47和其他具有挑战性的免疫检查点的路线图.
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