多尺度模拟和人类胆氨酸酸酶突变的分析:关于线粒体神经胃肠道脑病变的结构,动力和功能影响的见解
Khushboo Bhagat1, Amar Jeet Yadav1, Aditya K Padhi1
1Laboratory for Computational Biology & Biomolecular Design, School of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India.
The journal of physical chemistry. B
|March 20, 2025
概括
线粒体神经胃肠道脑病变 (MNGIE) 突变使人体胺酸酶 (HTP) 不稳定,损害了胺酸的结合,导致功能障碍. 计算方法揭示了这些遗传变化如何导致疾病.
科学领域:
- 生物化学 生物化学
- 计算生物学 计算生物学
- 遗传学 是一个遗传学.
背景情况:
- 线粒体神经胃肠道脑病变 (MNGIE) 是一种罕见的遗传疾病,与丁胺酸酶 (TP) 缺乏有关.
- 与MNGIE相关的突变影响TP结构,动态和功能的精确分子机制尚未完全理解.
研究的目的:
- 调查MNGIE相关突变对人类胺酸酶 (HTP) 结构,动态和胺结的分子效应.
- 通过使用多尺度计算方法阐明在MNGIE中HTP功能障碍背后的机制.
主要方法:
- 使用AlphaFold2进行结构建模.
- 对野生型和突变型HTP进行了广泛的分子动力学 (MD) 模拟 (全原子和粗粒度).
- 进行了蛋白质-连接体对接和结合自由能量景观分析.
- 系统地分析了与MNGIE相关的关键突变 (R44Q,G145R,G153S,K222S,E289A).
主要成果:
- MNGIE突变导致了HTP的显著不稳定,增加了灵活性,并降低了酶效率.
- 自由能量景观分析表明,突变的HTP转向不太稳定的形状.
- G145R突变导致活性部位的固体阻碍,阻断了提米丁结合.
结论:
- 与MNGIE相关的突变破坏了HTP的结构完整性和胸腺素结合能力,导致功能障碍.
- 这项研究为MNGIE的分子基础提供了基本的见解.
- 为MNGIE建立了未来研究和治疗开发的计算框架.
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