一个ninjurin-1-衍生α-螺旋的粉样纤维化:结构洞察力对形态转换的结构洞察力
Meijiao Wang1,2, Wencheng Xia3,4, Dan Zhao1,5
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
ACS nano
|October 2, 2025
概括
来自Ninjurin-1 (NINJ1) 的片段,称为HE30,从α螺旋转变为β片,形成粉样纤维. 这些纤维是自组装的,可以通过温度控制,为生物材料提供了潜力.
科学领域:
- 生物化学 生物化学
- 生物物理学的生物物理.
- 材料科学 材料科学 材料科学
背景情况:
- 粉样纤维素以其交叉β结构为特征,涉及各种生物过程和疾病.
- 宁林-1 (NINJ1) 是一种膜蛋白,在细胞死亡过程中对血膜破裂至关重要.
- 粉样纤维素形成的分子机制尚未完全理解.
研究的目的:
- 来自NINJ1.1的片 (HE30) 的自我组装和结构转换的研究.
- 阐明环境因素在HE30纤维细胞形成中的作用.
- 探索HE30纤维在生物材料中的潜在应用.
主要方法:
- 循环二重化谱法用于监测结构转变.
- 电子显微镜 (cryo-EM) 用于解析纤维结构.
- 原子力显微镜 (AFM) 用于in situ生长跟踪.
- 脂质重组测试用于评估膜破坏.
主要成果:
- 单质HE30诱导膜稀薄,并经历α-螺旋到β-片的过渡,导致粉样纤维的形成.
- 纤维细胞形态取决于温度,在高温下形成扭曲的结构.
- 低温电磁检测揭示了两种不同的纤维细胞多态体,通过疏水和静电相互作用稳定.
- 动被盐所抑制,被酸性条件所促进;性条件导致可逆分解.
- AFM显示出非对称的纤维细胞生长.
结论:
- HE30通过对环境有反应的α-螺旋转向β-片过渡自组合成粉样纤维.
- 纤维的形成和结构是由温度,pH值和离子强度调节的.
- HE30纤维是无毒的,可以作为纳米粒子组装的支架,表明生物材料的潜力.
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