PNAS:清华大学王新泉等人解析IL-33与受体作用的结构机制

2013-08-28 koo bio360

IL-33是IL-1家族的一个重要成员,在宿主防御及疾病的先天和适应性免疫反应中发挥着多效活性。IL-33通过它的配体结合主要受体 ST2 和IL-1受体辅助蛋白(IL-1RAcP)来发送信号,这两种受体均为IL-1受体家族成员。 为了阐明IL-33与它的受体之间的相互作用,来自清华大学生命科学学院等机构的研究人员确定了分辨率为 3.27 的 IL-33 与 ST




IL-33是IL-1家族的一个重要成员,在宿主防御及疾病的先天和适应性免疫反应中发挥着多效活性。IL-33通过它的配体结合主要受体 ST2 和IL-1受体辅助蛋白(IL-1RAcP)来发送信号,这两种受体均为IL-1受体家族成员。【原文下载

为了阐明IL-33与它的受体之间的相互作用,来自清华大学生命科学学院等机构的研究人员确定了分辨率为 3.27 的 IL-33 与 ST2 胞外域构成复合物的晶体结构。采用结构诱变和结合分析,得到的结构分析结果确定了 ST2 特异性识别IL-33的分子机制。研究人员将之与IL-1家族中的其他配体-受体复合物进行结构比较,证实表面电荷互补至关重要地决定了IL-1主要受体的配体结合特异性。

结合晶体学和小角度X射线散射研究揭示, ST2 在 D3 结构域和 D1D 2模块之间具有柔性铰链,而 IL-1RacP 在溶液中以一种游离状态显示刚性构象。 ST2 的分子灵活性提供了关于IL-1主要受体与配体结合时结构域层次构象变化的结构认识。IL-1RacP 的刚性则解释了它为何不能直接配体的原因。小角度X射线散射分析溶液中IL-33– ST2 –IL-1RacP复合物的结构,结果与 IL-1β–IL-1RII–IL-1RacP 和 IL-1β–IL-1RI–IL-1RacP 的晶体结构相似。

这些研究结果阐明了IL-33结构与功能的关系,支持并扩展了IL-1家族中配体-受体组装和激活的普遍模型。



清华大学生命科学学院的王新泉(Xinquan Wang)教授和台湾国立成功大学的王淑莺(Shuying Wang)助理教授是这篇论文的共同通讯作者。王新泉教授的主要研究方向为结构生物学。利用X-射线晶体学为主要研究手段,结合冷冻电子显微镜学和其他生物化学技术,研究生物大分子的结构与功能关系。研究目标目前集中在细胞因子特异结合并激活其受体分子,以及病原体逃避宿主免疫攻击的结构机理。

原始出处:

Xi Liu, Michal Hammel, Yanfeng He, John A. Tainer, U-Ser Jeng, Linqi Zhang, Shuying Wang, and Xinquan Wang. Structural insights into the interaction of IL-33 with its receptors. PNAS August 26, 2013; doi:10.1073/pnas.1308651110 【原文下载

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    2014-07-16 hongbochen
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    2014-01-02 drwjr
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    2013-08-30 宋威
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    2013-08-30 医生2397