基于蛋白质结构的FUS突变亚型与肌缩侧面硬化症患者的蛋白质错位化有关
Wanli Yang1,2,3, Zhen Luo4, Xuelin Tang1,2,3
1Yangzhi Rehabilitation Hospital (Shanghai Sunshine Rehabilitation Centre), Clinical Center for Brain and Spinal Cord Research, School of Medicine, Tongji University, Shanghai, 200090, China.
Molecular neurobiology
|May 24, 2025
概括
FUS基因的突变通过错误地定位RNA结合蛋白质,导致肌缩侧面硬化症 (ALS). 在FUS蛋白中的结构变化解释了ALS患者的疾病发病和严重程度的不同.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
背景情况:
- 错误地定位RNA结合蛋白 (RBPs) 和聚合物形成是神经退行性疾病的关键特征,如肌缩侧面硬化症 (ALS).
- 瘤融合基因 (FUS) 基因的突变,特别是林/氨酸-核定位信号 (PY-NLS) 域中的突变,通过影响核-细胞质运输,与ALS的发病有关.
- 将FUS PY-NLS突变与异质临床表现联系在一起的精确机制,包括发病时的年龄 (AAO),仍然不完全理解.
研究的目的:
- 调查p.R521位点的FUS突变,蛋白质错位化和ALS患者发病时年龄 (AAO) 的变异性之间的关系.
- 探索FUS蛋白突变体中的结构变化如何影响它们与Transportin-1的相互作用以及随后的细胞局部化.
- 为了确定FUS突变的特定结构子组是否与ALS中不同的临床表型相关.
主要方法:
- 在416名ALS患者队列中选FUS突变,以确定p.R521位点的特定变异.
- 使用AlphaFold-2用于在体中预测已识别的FUS p.R521突变体的蛋白质结构.
- 使用异热定位热量计来评估FUS突变体和Transportin-1之间的结合亲和力.
- 在细胞系 (HEK-293T和SH-SY5Y) 中进行免疫光检测,以评估FUS蛋白错位.
- 在患者队伍中分析FUS错位状态,结构子组和ALS发病年龄 (AAO) 之间的相关性.
主要成果:
- 在p.R521 (p.R521P,p.R521C,p.R521G,p.R521H) 确定了12名患有四种明显FUS突变的ALS患者,他们表现出广泛的AAO (20-56岁).
- 在AlphaFold-2分析中,突变物被分为"含有阿尔法螺旋" (p.R521C,p.R521H) 和"破坏阿尔法螺旋" (p.R521P,p.R521G) 的子组.
- 与"含有阿尔法螺旋体"子组相比",阿尔法螺旋体"子组在细胞模型中表现出较低的与Transportin-1的结合亲和力和增加的FUS错位化.
- FUS错位与ALSAAO显著相关,结构子组在研究的队列中显示出明显不同的AAO.
结论:
- 在p.R521位点的FUS突变导致ALS患者的不同临床表型,其特征是变化的发病年龄.
- 受特定突变影响的FUS C端PY-NLS域的结构完整性对于正常的细胞核-细胞质传输至关重要.
- 在"阿尔法螺旋中断"突变体中,受损的运输蛋白-1结合和随后的FUS错位导致ALS的发病和可变的临床表现.
相关概念视频
Amyloid Fibrils
11.7K
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
11.7K
Amyloid Fibrils
6.3K
6.3K
Protein Folding
126.5K
Overview
126.5K
Protein Folding
11.2K
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
11.2K
Mutations
94.4K
Overview
94.4K
Mutations
43.0K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
43.0K


