内分子相互作用动态调节由人类和小鼠α-synuclein所产生的纤维形成
Takashi Ohgita1, Hiroki Kono2, Izumi Morita3
1Laboratory of Biophysical Chemistry, Kyoto Pharmaceutical University, 5 Misasagi-Nakauchi-cho, Yamashina-ku, Kyoto, 607-8414, Japan. ohgita@mb.kyoto-phu.ac.jp.
Scientific reports
|July 5, 2023
概括
小鼠的α-synuclein (αS) 比人类的αS更快地形成粉样纤维. 在小鼠αS中,一种特定的S87N替代物通过破坏分子内相互作用来加速纤维细胞的形成,从而提供治疗洞察力.
科学领域:
- 神经科学是一个神经科学.
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 阿尔法-同核素 (αS) 纤维的形成是神经退行性疾病的核心.
- 鼠标αS纤维化粉胺基更快于人类αS,尽管其高序列相同性.
- 了解αS纤维化的运动调节是治疗策略的关键.
研究的目的:
- 为了研究αS纤维化的运动调节.
- 为了评估人类和小鼠αS之间的序列差异对纤维细胞形成的影响.
- 为了确定控制αS聚合率的特定残留物和分子内相互作用.
主要方法:
- 提奥夫拉T光测定与αS变体.
- 对域互换和C端截断αS的分析.
- 促进共振能量转移 (FRET) 分析以研究分子内相互作用.
主要成果:
- 与人类αS相比,小鼠αS表现出较高的核和纤维延长率.
- 在小鼠αS的NAC区域中的S87N替代在增强纤维细胞形成方面占主导地位,而不是A53T.
- 在人类αS中存在的C终端和N终端/NAC区域之间的分子内相互作用在小鼠αS中受到干扰.
- 在小鼠αS中的S87N替代被确定为这种扰乱相互作用的原因.
结论:
- C终端区域与N终端和NAC区域的内分子相互作用抑制αS纤维素的形成.
- 在小鼠αS中S87N的替代加速纤维细胞的形成,通过破坏这些分子内相互作用.
- 这一发现提供了对差异性αS聚合动力学和潜在治疗点的机制性见解.
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