PQBP3通过抑制PSME3介导的蛋白质体拉敏B1降解来防止衰老
Yuki Yoshioka1, Yong Huang1, Xiaocen Jin1
1Department of Neuropathology, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan.
The EMBO journal
|August 5, 2024
概括
核蛋白PQBP3作为一个守门员,防止细胞质DNA泄漏和神经元衰老. 突变性阿塔克辛-1降低了PQBP3,导致Purkinje细胞的衰老,这表明它们在神经退行中具有共同的作用.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 分子机制的分子机制
背景情况:
- 神经元衰老,特别是在非分裂的神经元中,是很少理解的,对其分子调节者的知识有限.
- 与神经退行性疾病相关的蛋白质在神经衰老中的参与是一个尚未探索的领域.
研究的目的:
- 研究核聚氨酸结合蛋白3 (PQBP3) 在调节神经元衰老中的作用.
- 探索PQBP3控制衰老的分子机制及其与多重氨酸 (polyQ) 神经退行性疾病的联系.
主要方法:
- 研究了PQBP3与PSME3和Lamin B1.1的相互作用.
- 评估了PQBP3耗尽对核膜稳定性和DNA泄漏的影响.
- 研究了polyQ蛋白质,特别是ATAXIN-1 (ATXN1) 对PQBP3定位和功能的影响.
- 分析了突变ATXN1.1.表达突变ATXN1.1.表达突变的小鼠模型中的PQBP3水平和衰老表型.
主要成果:
- 通过调节PSME3和Lamin B1之间的相互作用,PQBP3作为一个守门员,防止细胞质DNA泄漏和随后的衰老,从而防止Lamin B1降解.
- PQBP3的枯竭导致核膜不稳定,并将基因组DNA释放到细胞质中.
- ATAXIN-1将PQBP3绑定到包含体中,从而降低其核细胞水平.
- 突变的Atxn1敲入小鼠显示核PQBP3的减少和大脑小脑Purkinje细胞中的衰老表型.
结论:
- 通过保持核完整性和防止DNA泄漏,PQBP3在预防神经元衰老方面发挥着至关重要的作用.
- PQBP3和ATXN1之间的相互作用表明,在细胞衰老和多Q神经退行性疾病中都有一个共同的分子途径.
- PQBP3成为一个关键的核蛋白,在细胞衰老和神经退行中具有同类功能.
相关概念视频
Abnormal Proliferation
4.5K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.5K
Negative Regulator Molecules
35.2K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.2K
The Proteasome
819
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
819
Replicative Cell Senescence
3.6K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.6K
Regulated Protein Degradation
7.2K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
7.2K
The Spindle Assembly Checkpoint
3.1K
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
3.1K


