铁激活阿尔茨海默氏症的粉样蛋白前体蛋白质合成通过铁响应元素 (IRE) mRNA结合翻译启动因子
Mateen A Khan1, Taj Mohammad2, Zahra Samer Alalami1
1Department of Life Sciences, College of Science & General Studies, Alfaisal University, Riyadh 11533, Saudi Arabia.
International journal of biological macromolecules
|July 24, 2025
概括
铁可以增强阿尔茨海默病APP蛋白质的产生,通过增加APPmRNA的铁反应元件 (IRE) 和转化因子eIF4F之间的结合. 这种结合促进了APPmRNA的翻译,抵消了抑制因素.
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.
- 生物化学 生物化学
背景情况:
- 粉样蛋白前体蛋白 (APP) 与阿尔茨海默病 (AD) 病原和神经元退化有关.
- 铁通过APPmRNA的5'-未翻译区域 (5'-UTR) 的铁反应元素 (IRE) 影响APP合成.
- 翻译启动因子eIF4F在mRNA翻译中起作用.
研究的目的:
- 调查APP IRE和eIF4F之间的相互作用.
- 阐明铁在调节APPmRNA转化中的作用.
- 了解铁,eIF4F和IRP1在控制APP表达中的相互作用.
主要方法:
- 计算对接用于预测APP IRE和eIF4F之间的绑定相互作用.
- 基于光的结合试验来量化 APP IRE-eIF4F 的亲和力.
- 温度依赖性研究以确定相互作用的热力学参数.
- 在体外翻译试验中,使用eIF4F贫的提取物和不同度的铁.
主要成果:
- APP IRE 特别与eIF4F 结合,具有纳米分子亲和力,涉及键.
- 铁 (Fe2+) 增强了APP IRE与eIF4F的结合,促进了APP mRNA的翻译.
- Fe2+通过支持eIF4F结合而不是IRP1结合来逆转IRP1对蛋白质合成的抑制作用.
结论:
- 铁在调节APPmRNA翻译方面发挥着关键作用,通过调节RNA-蛋白相互作用来调节mRNA.
- APP IRE与eIF4F的结合在热力学上是有利的,并且由铁增强.
- 这些发现提供了铁在APP表达中的调节作用及其与阿尔茨海默病的潜在联系的见解.
相关概念视频
Translation
15.6K
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...
Translation Produces the Building Blocks of Life
Proteins are...
15.6K
Initiation of Translation
6.6K
6.6K
Regulation of Expression Occurs at Multiple Steps
23.4K
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
23.4K
Regulation of the Unfolded Protein Response
2.6K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.6K
Regulation of Expression at Multiple Steps
1.0K
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.0K
Alzheimer's Disease: Overview
669
Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
669


