活性HER4和HER2/HER4复合体的结构动力学受到不同的生长因子和糖化酶的微调
Raphael Trenker1, Devan Diwanji1,2, Tanner Bingham1
1Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA 94158, USA.
对人体表皮生长因子受体4 (HER4) 激活的结构洞察力揭示了同位体与HER2异位体的不同动态. 甘氨酸的修改稳定了HER4同位体,影响了受体功能.
科学领域:
- 分子和细胞生物学分子和细胞生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 人体表皮生长因子受体4 (HER4) 对于心血管和神经系统发育至关重要.
- 激活HER4涉及同位体化或异位体化与其他HER受体,特别是HER2.
- 之前对联体介导的HER4激活的结构研究是有限的.
研究的目的:
- 阐明由连接体介导的HER4激活的结构机制.
- 为了比较HER4同位体和HER2/HER4异位体的结构动态.
- 研究糖化在HER4受体复合体稳定中的作用.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定近全长结构.
- 获得了与神经调节素1β (NRG1β) 和β细胞蛋白 (BTC) 结合的HER2/HER4异构体和HER4同构体的结构.
- 模拟了HER4ectodomains中的多个甘氨酸修饰.
主要成果:
- 确定了与NRG1β和BTC结合的HER2/HER4异构体和HER4同构体的近全长冷EM结构.
- 与HER2/EGFR和HER2/HER3相比,HER2/HER4异构体表现出类似的结构和不那么动态的接口.
- HER4同位体表现出更大的大规模动力学,模拟的甘氨酸稳定了同位体接口在异位体上.
结论:
- 干结合在HER4同位体和HER2/HER4异位体中诱导了不同的构造动力学.
- 糖基化在稳定HER4同位体形成方面发挥着重要作用.
- 这些发现为HER4受体激活和调节提供了新的结构性见解.
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