相关实验视频
Updated: Jul 6, 2026

10:56
Assays for the Degradation of Misfolded Proteins in Cells
Published on: August 28, 2016
神经退行性疾病蛋白质aprataxin解决了堕落的DNA结合中间体
Ivan Ahel1, Ulrich Rass, Sherif F El-Khamisy
1Cancer Research UK, London Research Institute, Clare Hall Laboratories, South Mimms, Herts EN6 3LD, UK.
Nature
|September 12, 2006
概括
阿普拉素解决了堕落的DNA结合,防止未经修复的DNA链断裂. 这一发现澄清了阿塔克西亚眼运动失调-1背后的机制,这是一种由APTX基因突变引起的神经疾病.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 神经科学是一个神经科学.
背景情况:
- ATAXIA眼运动性阿普拉西亚-1 (AOA1) 是一种神经疾病,与APTX基因的突变有关,该基因对aprataxin进行编码.
- 阿普拉素是一种胺三元组 (HIT) 域蛋白,与DNA修复因子相互作用,表明它在DNA修复中起作用.
- 缺陷APTX的细胞对DNA破坏性物质和染色体异常的增加表现出敏感性,但aprataxin的确切功能尚不清楚.
研究的目的:
- 阐明阿普拉素在DNA修复中的直接作用和生理基质.
- 调查APTX基因的突变如何对AOA1.1的致病产生产生贡献.
主要方法:
- 纯化阿普拉素蛋白被用于生物化学测试.
- 使用了APTX缺陷的DT40细胞和Aptx-/-小鼠初级神经细胞的提取物.
- 分析了阿普拉在DNA结合中间体上的酶活性.
主要成果:
- 亚普拉素被证明可以解决堕胎的DNA结合中间体.
- 该蛋白质催化了从5'-酸末端在DNA裂和缺口释放基酸基的释放.
- 这种作用产生了5'-酸盐末端,可以有效地重组DNA.
结论:
- 通过处理异常结合产物,阿普拉素直接参与DNA修复.
- 在AOA1中的神经缺陷可能是由于阿普拉素功能受损而导致未被修复的DNA链断裂的积累引起的.
- 这些发现为了解AOA1病原体提供了分子基础.
相关概念视频
Amyloid Fibrils
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, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Restarting Stalled Replication Forks
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Botulism
Botulism is a life-threatening neuroparalytic condition caused by botulinum neurotoxin, which is produced by the bacterium Clostridium botulinum, a Gram-positive, spore-forming, obligate anaerobe.In adults, the toxin enters the body in different ways: in foodborne botulism, the preformed toxin is absorbed in the intestine. In wound botulism, spores grow in injured tissue and release the toxin into the blood. Infant botulism differs mechanistically from adult forms. In infants, botulism commonly...
Alzheimer Disease l: Introduction
Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
Alzheimer Disease ll: Pathophysiology
Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...

