DNAJA2和Hero11介导类似的TDP-43的构造延伸和聚合抑制
Andy Y W Lam1,2, Kotaro Tsuboyama1,3, Hisashi Tadakuma1,4
1Institute for Quantitative Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.
概括
英雄蛋白质,像分子伴侣一样,通过稳定内在无序区域的扩展形状来防止有毒蛋白质的聚合,例如TDP-43,这是ALS等神经退行性疾病的关键因素.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 神经科学是一个神经科学.
背景情况:
- 具有类域的RNA结合蛋白 (RBPs) 容易聚集,这与神经退行性疾病有关.
- TDP-43聚合是肌缩侧面硬化 (ALS) 和前叶退化 (FTLD) 的标志.
- 分子陪伴剂抑制蛋白质聚合,但其他蛋白质的保护机制,如英雄蛋白质,尚不清楚.
研究的目的:
- 调查英雄蛋白和伴侣蛋白如何阻止TDP-43.3的聚合.
- 阐明在单分子水平上由Hero蛋白和伴侣蛋白诱导的构造变化.
- 为了将单分子构造效应与宏观聚合抑制联系起来.
主要方法:
- 单分子弗斯特共振能量转移 (smFRET) 用于监测TDP-43低复杂性域 (LCD) 构造.
- 评估了野生型和突变型TDP-43液晶显示器的形态异质性.
- 分析了DNAJA2 (chaperone) 和Hero11 (Hero蛋白) 对TDP-43液晶显示器形状的影响.
主要成果:
- 野生型TDP-43液晶显示器表现出高度的形状异质性.
- 与ALS相关的A315T突变诱导了TDP-43 LCD中的崩形状.
- DNAJA2和Hero11都稳定了TDP-43 LCD的扩展形状,与抑制的聚合相关.
结论:
- 英雄蛋白,类似于陪伴者,可以通过保持客户端蛋白质的结构完整性来防止蛋白质聚合.
- 稳定内在无序区域的扩展形状是抑制病态蛋白质聚合的关键机制.
- 这项研究提供了单分子结构动力学和蛋白质聚合的宏观抑制之间的联系.
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