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通过3D计算机引导对接和系统性位点突变发生,揭示了对人类IL-6 - IL-6R相互作用部位的新见解

Kaitong Li¹, Junyu Cai², Zhiyang Jiang¹

¹Laboratory for Genetic Engineering of Antibodies and Functional Proteins, Beijing Institute of Pharmacology and Toxicology, Beijing, 100850, China.

Scientific reports

|August 7, 2024

概括

了解插白素-6 (IL-6) 结合是自身免疫性疾病的关键. 这项研究使用计算设计和突变分析揭示了参与IL-6受体相互作用的关键氨基酸残留物,帮助开发新药.

科学领域:

生物化学生物化学
分子生物学分子生物学
免疫学免疫学免疫学

背景情况:

洲际蛋白-6 (IL-6) 是自身免疫和炎症性疾病中的关键细胞因子.
针对IL-6相互作用是开发新疗法的关键策略.

研究的目的:

阐明IL-6与其受体 (IL-6R) 相互作用的氨基酸水平机制.
为了确定对IL-6结合和信号传递至关重要的关键残留物.
为设计向IL-6抑制剂提供基础.

主要方法:

利用计算机引导的药物设计来预测IL-6-IL-6R相互作用部位.
产生和表征IL-6突变 (例如,R167A,E171A,R181A/V,D螺旋删除).
评估了结合亲缘关系,IL-6R-gp130复合体形成和STAT3酸化.

主要成果:

R167A突变显示IL-6R亲和力增加,并增强了STAT3酸化.
该E171A突变显示IL-6R亲和力降低,但更强的IL-6R-gp130复合体结合和增强的生物活性.
其余物R178和R181对IL-6被IL-6R识别至关重要;R181A/V突变物失去了IL-6R的结合.
D螺旋删除完全取消了对IL-6R的IL-6结合亲和力.

结论:

特定的氨基酸残留物 (R167,E171,R178,R181) 和D螺旋对IL-6的结合和功能至关重要.
这项研究提供了对IL-6受体相互作用机制的关键见解.
这些发现支持下一代IL-6抑制剂的合理设计.

关键词:

计算机引导的对接方式 IL-6 - IL-6R - gp130 复合体是一个复合体.表面等离子体共振 (SPR) 是一种系统性的突变发生.

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