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Updated: Jun 9, 2025

Assay Development for High Content Quantification of Sod1 Mutant Protein Aggregate Formation in Living Cells

Assay Development for High Content Quantification of Sod1 Mutant Protein Aggregate Formation in Living Cells

Published on: October 4, 2017

由导致ALS的SOD1突变诱导的粉样纤维结构和铁灭激活

Li-Qiang Wang¹, Yeyang Ma^2,3, Mu-Ya Zhang¹

¹Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, TaiKang Center for Life and Medical Sciences, Wuhan University, Wuhan 430072, China.

Science advances

|October 30, 2024

概括

两种与ALS相关的铜超氧化脱酶 (SOD1) 突变形成了独特的粉样纤维. 这些有毒纤维细胞损害线粒体,促进铁亡,提供了对ALS病变的洞察力.

科学领域:

生物化学生物化学
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:

铜超氧化物脱酶 (SOD1) 中超过200种突变与肌缩性侧面硬化症 (ALS) 有关.
特定的SOD1突变H46R和G85R显示金属离子结合能力降低,这是ALS病变的一个因素.
了解SOD1突变聚合的结构基础对于ALS研究至关重要.

研究的目的:

确定由H46R和G85RSOD1突变体形成的粉样纤维的冷电子显微镜结构.
将突变SOD1纤维的结构特征和细胞毒性与野生型SOD1纤维进行比较.
阐明SOD1突变聚合有助于ALS病理的机制.

主要方法:

电子显微镜 (cryo-EM) 用于解析纤维结构.
生物化学测试以评估金属离子结合.
细胞培养实验评估纤维细胞毒性,线粒体损伤和铁灭诱导.

主要成果:

获得了H46R和G85R SOD1粉样纤维的新型冷-EM结构,揭示了与野生型纤维不同的独特蛇形排列.
G85R纤维结构显示了一个由七或八个β链组成的核心,由疏水性腔和R85-D101盐桥稳定.
突变的SOD1纤维素表现出明显更高的毒性,增强了野生型SOD1聚合,诱导了线粒体功能障碍,并在细胞培养物中激活了ferroptosis.

结论:

与ALS相关的SOD1突变可以导致形成独特的粉样纤维结构.
这些突变的SOD1纤维素具有独特的结构特征,增强了它们的细胞毒性和传播.
这些发现提供了关于SOD1突变如何通过线粒体损伤和铁亡驱动ALS病变的结构性见解.

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