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结构细节的螺旋介导多元化保护区域的TDP-43 C终端域的结构细节

Azamat Rizuan¹, Jayakrishna Shenoy², Priyesh Mohanty¹

¹Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, USA.

Nature communications

|November 26, 2025

概括

研究人员模拟了TAR DNA结合蛋白-43 (TDP-43) 保护区域的原生结构,揭示了对于RNA处理至关重要的螺旋组件. 这一发现为神经退行性疾病 (如ALS) 和潜在的治疗点提供了洞察力.

科学领域:

分子生物学分子生物学
神经科学是一个神经科学.
结构生物学结构生物学

背景情况:

TAR DNA 结合蛋白-43 (TDP-43) C-终端域 (CTD) 的病理性包容是神经退行性疾病的标志,如肌缩侧面硬化症 (ALS) 和前性痴呆症.
TDP-43 CTD的聚合倾向阻碍了原生TDP-43的结构特征.

研究的目的:

为 TDP-43 CTD 的保存区域 (CR) 的生理多元化提出结构模型.
了解TDP-43功能的结构基础及其在ALS中的破坏.

主要方法:

核磁共振光谱测定TDP-43 CR的原始状态.
综合结构生物学方法包括分析超离心,NMR衍生接触,AlphaFold2-Multimer建模和全原子分子动力学模拟.

主要成果:

在生理条件下,TDP-43 CR的原生状态是α-螺旋.
疏水性残留物驱动CR螺旋-螺旋组件,相位分离和核保留,而极性残留物则调节这些过程.
TDP-43 CR形成了动态的,多重体螺旋组件,由富含 metionin 的核心稳定,特异性贡献来自酸/白对.

结论:

结构模型揭示了TDP-43 CR如何在生理上多重化成螺旋组件.
这些结构阐明了TDP-43 CR的功能作用以及ALS相关突变如何破坏其功能.
已识别的结构提供了潜在的药理上可针对性的部位,以防止致病性TDP-43聚合物的形成.

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